ADS7950 ADS7951 ADS7952 ADS7953 ADS7954 ADS7955 ADS7956 ADS7957 ADS7958 ADS7959 - Datasheet Archive

 

ADS7954, ADS7955, ADS7956, ADS7957 ADS7958, ADS7959, ADS7960, ADS7961 www.ti.com

 

ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 12/10/8-Bit, 1 MSPS, 16/12/8/4-Channel, Single-Ended, MicroPower, Serial Interface ADCs FEATURES DESCRIPTION 1 · · · · · · · · · · · · · · · 1-MHz Sample Rate Serial Devices Product Family of 12/10/8-Bit Resolution Zero Latency 20-MHz Serial Interface Analog Supply Range: 2.7 to 5.25V I/O Supply Range: 1.7 to 5.25V Two SW Selectable Unipolar, Input Ranges: 0 to 2.5V and 0 to 5V Auto and Manual Modes for Channel Selection 12,8,4-Channel Devices can Share 16 Channel Device Footprint Two Programmable Alarm Levels per Channel Four Individually Configurable GPIOs Typical Power Dissipation: 14.5 mW (+VA = 5V, +VBD = 3V) at 1 MSPS Power-Down Current (1 µA) Input Bandwidth (47 at 3dB) 30-Pin and 38-Pin TSSOP Packages The devices include a capacitor based SAR A/D converter with inherent sample and hold. The devices accept a wide analog supply range from 2.7V to 5.25V. Very low power consumption makes these devices suitable for battery-powered and isolated power supply applications. A wide 1.7V to 5.25V I/O supply range facilitates a glue-less interface with the most commonly used CMOS digital hosts. The serial interface is controlled by CS and SCLK for easy connection with microprocessors and DSP. The input signal is sampled with the falling edge of CS. It uses SCLK for conversion, serial data output, and reading serial data in. The devices allow auto sequencing of preselected channels or manual selection of a channel for the next conversion cycle. There are two software selectable input ranges (0V 2.5V and 0V - 5V), four individually configurable GPIOs, and two programmable alarm thresholds per channel. These features make the devices suitable for most data acquisition applications. APPLICATIONS · · · · · · · The ADS79XX ADS79XX is a 12/10/8-bit multichannel analog-to-digital converter family. The following table shows all twelve devices from this product family. PLC / IPC Battery Powered Systems Medical Instrumentation Digital Power Supplies Touch Screen Controllers High-Speed Data Acquisition Systems High-Speed Closed-Loop Systems The devices offer an attractive power-down feature. This is extremely useful for power saving when the device is operated at lower conversion speeds. The 16/12-channel devices from this family are available in a 38-pin TSSOP package and the 4/8-channel devices are available in a 30-pin TSSOP package. MICROPOWER MULTI-CHANNEL ADS79XX ADS79XX FAMILY RESOLUTION NUMBER OF CHANNELS 12 BIT 10 BIT 8 BIT 16 ADS7953 ADS7953 ADS7957 ADS7957 ADS7961 ADS7961 12 ADS7952 ADS7952 ADS7956 ADS7956 ADS7960 ADS7960 8 ADS7951 ADS7951 ADS7955 ADS7955 ADS7959 ADS7959 4 ADS7950 ADS7950 ADS7954 ADS7954 ADS7958 ADS7958 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2008, Texas Instruments Incorporated ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ADS79XX ADS79XX BLOCK DIAGRAM REF MXO AINP Ch0 Ch1 +VA AGND ADC Ch2 SDO Compare Alarm Threshold Control Logic & Sequencing Ch n* GPIO BDGND SDI SCLK CS VBD NOTE: n* is number of channels (16,12,8, or 4) depending on the device from the ADS79XX ADS79XX product family. ORDERING INFORMATION - 12-BIT 12-BIT MAXIMUM INTEGRAL LINEARITY (LSB) MODEL MAXIMUM DIFFERENTIAL LINEARITY (LSB) NO MISSING CODES AT RESOLUTION (BIT) NUMBER OF CHANNELS PACKAGE TYPE 16 TRANSPORT MEDIA QTY 38 pin TSSOP PACKAGE DESIGNATOR TEMPERATURE RANGE ORDERING INFORMATION ADS7953SBDBT ADS7953SBDBT Tube, 50 ADS7953SBDBTR ADS7953SBDBTR ADS7953 ADS7953 SB Reel, 2000 ADS7952SBDBT ADS7952SBDBT 12 ±1 ±1 Tube, 50 ADS7952SBDBTR ADS7952SBDBTR ADS7952 ADS7952 SB Reel, 2000 38 pin TSSOP 12 DBT ­40°C to 125°C ADS7951SBDBT ADS7951SBDBT 8 Tube, 60 ADS7951SBDBTR ADS7951SBDBTR ADS7951 ADS7951 SB Reel, 2000 30 pin TSSOP ADS7950SBDBT ADS7950SBDBT 4 Tube, 60 ADS7950SBDBTR ADS7950SBDBTR ADS7950 ADS7950 SB Reel, 2000 30 pin TSSOP ADS7953SDBT ADS7953SDBT 16 Tube, 50 ADS7953SDBTR ADS7953SDBTR ADS7953 ADS7953 S Reel, 2000 38 pin TSSOP ADS7952SDBT ADS7952SDBT 12 ±1.5 ±2 Tube, 50 ADS7952SDBTR ADS7952SDBTR ADS7952 ADS7952 S Reel, 2000 38 pin TSSOP 11 DBT ­40°C to 125°C ADS7951SDBT ADS7951SDBT 8 Tube, 60 ADS7951SDBTR ADS7951SDBTR ADS7951S ADS7951S Reel, 2000 30 pin TSSOP ADS7950SDBT ADS7950SDBT 2 4 Submit Documentation Feedback Tube, 60 ADS7950SDBTR ADS7950SDBTR ADS7950 ADS7950 S Reel, 2000 30 pin TSSOP Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 ORDERING INFORMATION - 10-BIT 10-BIT MODEL MAXIMUM INTEGRAL LINEARITY (LSB) MAXIMUM DIFFERENTIAL LINEARITY (LSB) NO MISSING CODES AT RESOLUTION (BIT) NUMBER OF CHANNELS PACKAGE TYPE 16 38 pin TSSOP PACKAGE DESIGNATOR TEMPERATURE RANGE ORDERING INFORMATION TRANSPORT MEDIA QTY ADS7957SDBT ADS7957SDBT Tube, 50 ADS7957SDBTR ADS7957SDBTR ADS7957 ADS7957 S Reel, 2000 ADS7956SDBT ADS7956SDBT 12 ±0.5 ±0.5 Tube, 50 ADS7956SDBTR ADS7956SDBTR ADS7956 ADS7956 S Reel, 2000 38 pin TSSOP 10 DBT ­40°C to 125°C ADS7955SDBT ADS7955SDBT 8 Tube, 60 ADS7955SDBTR ADS7955SDBTR ADS7955 ADS7955 S Reel, 2000 30 pin TSSOP ADS7954SDBT ADS7954SDBT 4 Tube, 60 ADS7954SDBTR ADS7954SDBTR ADS7954 ADS7954 S Reel, 2000 30 pin TSSOP ORDERING INFORMATION - 8-BIT MODEL MAXIMUM INTEGRAL LINEARITY (LSB) MAXIMUM DIFFERENTIAL LINEARITY (LSB) NO MISSING CODES AT RESOLUTION (BIT) NUMBER OF CHANNELS PACKAGE TYPE 16 TRANSPORT MEDIA QTY 38 pin TSSOP PACKAGE DESIGNATOR TEMPERATURE RANGE ORDERING INFORMATION ADS7961SDBT ADS7961SDBT Tube, 50 ADS7961SDBTR ADS7961SDBTR ADS7961 ADS7961 S Reel, 2000 ADS7960SDBT ADS7960SDBT 12 ±0.3 ±0.3 Tube, 50 ADS7960SDBTR ADS7960SDBTR ADS7960 ADS7960 S Reel, 2000 38 pin TSSOP 8 DBT ­40°C to 125°C ADS7959SDBT ADS7959SDBT 8 Tube, 60 ADS7959SDBTR ADS7959SDBTR ADS7959 ADS7959 S Reel, 2000 30 pin TSSOP ADS7958SDBT ADS7958SDBT 4 Tube, 60 ADS7958SDBTR ADS7958SDBTR ADS7958 ADS7958 S Reel, 2000 30 pin TSSOP ABSOLUTE MAXIMUM RATINGS (1) VALUE AINP or CHn to AGND UNIT ­0.3 to +VA +0.3 V +VA to AGND, +VBD to BDGND ­0.3 to +7.0 V Digital input voltage to BDGND ­0.3 to (7.0) V Digital output to BDGND ­0.3 to (+VA + 0.3) V Operating temperature range ­40 to 125 °C Storage temperature range ­65 to 150 °C 150 °C Junction temperature (TJ Max) TSSOP package Power dissipation JA Thermal impedance (TJ Max­TA)/JA 100.6 °C/W ADS79XX ADS79XX family of devices are rated for MSL2 260°C per the JSTD-020 JSTD-020 specifications (1) Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. Exposure to absolute maximum conditions for extended periods may affect device reliability. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 3 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com ELECTRICAL CHARACTERISTICS, ADS7950/51/52/53 ADS7950/51/52/53 +VA = 2.7 V to 5.25 V, +VBD = 1.7 V to 5.25 V, TA = -40°C to 125°C, fsample = 1 MHz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ANALOG INPUT Full-scale input span (1) Range 1 0 Vref Range 2 0 2*Vref ­0.20 VREF +0.20 ­0.20 2*VREF +0.20 Range 1 Absolute input range Range 2 V 15 nA 12 TA = 125°C F 61 Input capacitance Input leakage current V Bits SYSTEM PERFORMANCE Resolution No missing codes Integral linearity Differential linearity ADS795XSB ADS795XSB (2) 12 ADS795XS ADS795XS (2) ADS795XSB ADS795XSB (2) ­1 ±0.5 1 ­1.5 ADS795XS ADS795XS (2) ±0.75 1.5 ADS795XSB ADS795XSB (2) ­1 ±0.5 1 ADS795XS ADS795XS (2) ­2 ±0.75 1.5 ­3.5 ±1.1 3.5 ­2 ±0.2 2 Offset error (4) Gain error Bits 11 Range 1 Range 2 ±0.2 LSB (3) LSB LSB LSB SAMPLING DYNAMICS Conversion time 20 MHz sclk 800 Acquisition time Maximum throughput rate 325 nSec nSec 20 MHz sclk 1.0 MHz Aperture delay 5 nsec Step response 150 nsec Over voltage recovery 150 nsec ­82 dB dB DYNAMIC CHARACTERISTICS Total harmonic distortion (5) Signal-to-noise ratio 100 kHz 70 71.7 100 kHz, ADS795XS ADS795XS (2) Signal-to-noise + distortion 100 kHz, ADS795XSB ADS795XSB (2) 70 71.7 100 kHz, ADS795XSB ADS795XSB (2) 69 71.3 68 71.3 100 kHz, ADS795XS ADS795XS (2) dB Spurious free dynamic range 100 kHz 84 dB Small signal bandwidth At ­3 dB 47 MHz Channel-to-channel crosstalk Any off-channel with 100kHz, Full-scale input to channel being sampled with DC input (isolation crosstalk). ­95 From previously sampled to channel with 100kHz, Full-scale input to channel being sampled with DC input (memory crosstalk). ­85 dB ETERNAL REFERENCE INPUT Vref reference voltage at REFP Reference resistance (1) (2) (3) (4) (5) 4 2.49 2.5 2.51 100 V k Ideal input span; does not include gain or offset error. ADS795X ADS795X, where X indicates 0, 1, 2, or 3 LSB means Least Significant Bit. Measured relative to an ideal full-scale input Calculated on the first nine harmonics of the input frequency. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 ELECTRICAL CHARACTERISTICS, ADS7950/51/52/53 ADS7950/51/52/53 (continued) +VA = 2.7 V to 5.25 V, +VBD = 1.7 V to 5.25 V, TA = -40°C to 125°C, fsample = 1 MHz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ALARM SETTING Higher threshold range 0 FFC Hex Lower threshold range 0 FFC Hex DIGITAL INPUT/OUTPUT Logic family CMOS VIH 0.7*(+VBD) VIL 0.8 VIL +VBD = 3 V 0.4 V VOH At Isource = 200 µA VOL Logic level +VBD = 5 V At Isink = 200 µA V Data format MSB first Vdd-0.2 0.4 MSB First POWER SUPPLY REQUIREMENTS +VA supply voltage 2.7 3.3 5.25 +VBD supply voltage 1.7 3.3 5.25 At +VA = 2.7 to 3.6 V and 1MHz throughput Supply current (normal mode) 1.8 At +VA = 2.7 to 3.6 V static state V mA 1.05 mA At +VA = 4.7 to 5.25 V and 1 MHz throughput 2.3 3 mA At +VA = 4.7 to 5.25 V static state 1.1 1.5 mA 1 +VBD supply current +VA = 5.25V, fs = 1MHz µA 1 Power-down state supply current mA µSec Power-up time 1 Invalid conversions after power up or reset 1 Number s TEMPERATURE RANGE Specified performance ­40 125 °C ELECTRICAL CHARACTERISTICS, ADS7954/55/56/57 ADS7954/55/56/57 +VA = 2.7 V to 5.25 V, +VBD = 1.7 V to 5.25 V, TA = -40°C to 125°C, fsample = 1 MHz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ANALOG INPUT Range 1 0 Vref Range 2 0 2*Vref Range 1 ­0.20 VREF +0.20 Range 2 Full-scale input span (1) ­0.20 2*VREF +0.20 Absolute input range V V 15 TA = 125°C nA 10 Input leakage current F 61 Input capacitance Bits SYSTEM PERFORMANCE Resolution No missing codes 10 Bits Integral linearity ­0.5 ±0.2 0.5 LSB (2) Differential linearity ­0.5 ±0.2 0.5 LSB ­1.5 ±0.5 1.5 LSB Offset error (1) (2) (3) (3) Ideal input span; does not include gain or offset error. LSB means Least Significant Bit. Measured relative to an ideal full-scale input Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 5 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com ELECTRICAL CHARACTERISTICS, ADS7954/55/56/57 ADS7954/55/56/57 (continued) +VA = 2.7 V to 5.25 V, +VBD = 1.7 V to 5.25 V, TA = -40°C to 125°C, fsample = 1 MHz (unless otherwise noted) PARAMETER TEST CONDITIONS Range 1 Gain error MIN TYP MAX ­1 ±0.1 1 Range 2 ±0.1 UNIT LSB SAMPLING DYNAMICS Conversion time 20 MHz SCLK Acquisition time 800 325 Maximum throughput rate nSec nSec 20 MHz SCLK 1.0 MHz Aperture delay 5 nsec Step response 150 nsec Over voltage recovery 150 nsec ­80 dB DYNAMIC CHARACTERISTICS Total harmonic distortion (4) 100 kHz Signal-to-noise ratio 100 kHz 60 Signal-to-noise + distortion 100 kHz 60 Spurious free dynamic range 100 kHz 82 dB Full power bandwidth At ­3 dB 47 MHz dB Any off-channel with 100kHz, Full-scale input to channel being sampled with DC input. Channel-to-channel crosstalk ­95 From previously sampled to channel with 100kHz, Full-scale input to channel being sampled with DC input. ­85 dB ETERNAL REFERENCE INPUT Vref reference voltage at REFP 2.49 Reference resistance 2.5 2.51 100 V k ALARM SETTING Higher threshold range 000 FFC Hex Lower threshold range 000 FFC Hex DIGITAL INPUT/OUTPUT Logic family CMOS VIH 0.7*(+VBD) VIL +VBD = 5 V VIL +VBD = 3 V VOH At Isource = 200 µA VOL Logic level At Isink = 200 µA Data format MSB first 0.8 0.4 V V Vdd-0.2 0.4 MSB First POWER SUPPLY REQUIREMENTS +VA supply voltage 2.7 At +VA = 2.7 to 3.6 V and 1MHz throughput Supply current (normal mode) At +VA = 2.7 to 3.6 V static state 5.25 1.7 +VBD supply voltage 3.3 3.3 5.25 1.8 1.05 V mA 1 mA At +VA = 4.7 to 5.25 V and 1 MHz throughput 2.3 3 mA At +VA = 4.7 to 5.25 V static state 1.1 1.5 mA Power-down state supply current +VBD supply current µA 1 +VA = 5.25V, fs = 1MHz 1 mA µSec Power-up time 1 Invalid conversions after power up or reset 1 Numbers (4) 6 Calculated on the first nine harmonics of the input frequency. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 ELECTRICAL CHARACTERISTICS, ADS7954/55/56/57 ADS7954/55/56/57 (continued) +VA = 2.7 V to 5.25 V, +VBD = 1.7 V to 5.25 V, TA = -40°C to 125°C, fsample = 1 MHz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 125 °C MAX UNIT TEMPERATURE RANGE Specified performance ­40 ELECTRICAL CHARACTERISTICS, ADS7958/59/60/61 ADS7958/59/60/61 +VA = 2.7 V to 5.25 V, +VBD = 1.7 V to 5.25 V, TA = -40°C to 125°C, fsample = 1 MHz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP ANALOG INPUT Range 1 0 Vref Range 2 0 2*Vref Range 1 ­0.20 VREF +0.20 Range 2 Full-scale input span (1) ­0.20 2*VREF +0.20 Absolute input range V V 15 TA = 125°C nA 8 Input leakage current F 61 Input capacitance Bits SYSTEM PERFORMANCE Resolution No missing codes 8 Bits Integral linearity ­0.3 ±0.1 0.3 LSB (2) Differential linearity ­0.3 ±0.1 0.3 LSB ­0.5 ±0.2 0.5 LSB ­0.6 ±0.1 0.6 Offset error (3) Gain error Range 1 Range 2 ±0.1 LSB SAMPLING DYNAMICS Conversion time 20 MHz SCLK Acquisition time Maximum throughput rate 800 325 nSec nSec 20 MHz SCLK 1.0 MHz Aperture delay 5 nsec Step response 150 nsec Over voltage recovery 150 nsec ­75 dB DYNAMIC CHARACTERISTICS Total harmonic distortion (4) 100 kHz Signal-to-noise ratio 100 kHz 49 Signal-to-noise + distortion 100 kHz 49 Spurious free dynamic range 100 kHz ­78 dB Full power bandwidth At ­3 dB 47 MHz dB Any off-channel with 100kHz, Full-scale input to channel being sampled with DC input. Channel-to-channel crosstalk ­95 From previously sampled to channel with 100kHz, Full-scale input to channel being sampled with DC input. ­85 dB ETERNAL REFERENCE INPUT Vref reference voltage at REFP Reference resistance (1) (2) (3) (4) 2.49 2.5 2.51 100 V k Ideal input span; does not include gain or offset error. LSB means Least Significant Bit. Measured relative to an ideal full-scale input Calculated on the first nine harmonics of the input frequency. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 7 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com ELECTRICAL CHARACTERISTICS, ADS7958/59/60/61 ADS7958/59/60/61 (continued) +VA = 2.7 V to 5.25 V, +VBD = 1.7 V to 5.25 V, TA = -40°C to 125°C, fsample = 1 MHz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ALARM SETTING Higher threshold range 000 FF Hex Lower threshold range 000 FF Hex DIGITAL INPUT/OUTPUT Logic family CMOS VIH 0.7*(+VBD) VIL 0.8 VIL +VBD = 3 V 0.4 V VOH At Isource = 200 µA VOL Logic level +VBD = 5 V At Isink = 200 µA V Vdd-0.2 0.4 Data format MSB First POWER SUPPLY REQUIREMENTS +VA supply voltage 2.7 3.3 5.25 +VBD supply voltage 1.7 3.3 5.25 At +VA = 2.7 to 3.6 V and 1MHz throughput Supply current (normal mode) 1.8 At +VA = 2.7 to 3.6 V static state V mA 1.05 mA At +VA = 4.7 to 5.25 V and 1 MHz throughput 2.3 3 mA At +VA = 4.7 to 5.25 V static state 1.1 1.5 mA 1 +VBD supply current +VA = 5.25V, fs = 1MHz µA 1 Power-down state supply current mA µSec Power-up time 1 Invalid conversions after power up or reset 1 Numbers TEMPERATURE RANGE Specified performance ­40 125 °C MAX UNIT TIMING REQUIREMENTS (see Figure 43, Figure 44, Figure 45, and Figure 46) All specifications typical at ­40°C to 125°C, +VA = 2.7 V to 5.25 V (unless otherwise specified) PARAMETER TEST CONDITIONS (1) (2) MIN TYP +VBD = 1.8 V Conversion time +VBD = 3 V 16 +VBD = 5 V tconv 16 16 +VBD = 1.8 V 40 +VBD = 3 V 40 +VBD = 5 V tq Minimum quiet sampling time needed from bus 3-state to start of next conversion 40 ns +VBD = 1.8 V Delay time, CS low to first data (DO­15) out 38 +VBD = 3 V 27 +VBD = 5 V td1 17 +VBD = 1.8 V tsu1 Setup time, CS low to first rising edge of SCLK 6 8 35 +VBD = 3 V 27 +VBD = 5 V (1) (2) ns 4 +VBD = 1.8 V Delay time, SCLK falling to SDO next data bit valid ns 8 +VBD = 3 V +VBD = 5 V td2 SCLK 17 ns 1.8V specifications apply from 1.7V to 1.9V, 3V specifications apply from 2.7V to 3.6V, 5V specifications apply from 4.75V to 5.25V. With 50-pF load Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 TIMING REQUIREMENTS (see Figure 43, Figure 44, Figure 45, and Figure 46) (continued) All specifications typical at ­40°C to 125°C, +VA = 2.7 V to 5.25 V (unless otherwise specified) TEST CONDITIONS (1) (2) PARAMETER MIN +VBD = 1.8 V +VBD = 3 V Hold time, SCLK falling to SDO data bit valid MAX 5 +VBD = 5 V th1 TYP 3 ns +VBD = 1.8 V Delay time, 16th SCLK falling edge to SDO 3-state 26 +VBD = 3 V 22 +VBD = 5 V td3 13 +VBD = 1.8 V tsu2 3 +VBD = 5 V 12 +VBD = 3 V 10 +VBD = 5 V Hold time, rising edge of SCLK to SDI valid 6 +VBD = 1.8 V Pulse duration CS high ns 20 +VBD = 3 V 20 +VBD = 5 V tw1 20 ns +VBD = 1.8 V Delay time CS high to SDO 3-state 24 +VBD = 3 V 21 +VBD = 5 V td4 12 +VBD = 1.8 V 20 +VBD = 3 V Pulse duration SCLK low 20 20 +VBD = 5 V twl 20 +VBD = 1.8 V Pulse duration SCLK high 20 ns ns +VBD = 1.8 V 20 +VBD = 3 V 20 +VBD = 5 V Frequency SCLK ns 20 +VBD = 3 V +VBD = 5 V twh ns 4 +VBD = 1.8 V th2 ns 2 +VBD = 3 V Setup time, SDI valid to rising edge of SCLK UNIT 7 20 MHz DEVICE INFORMATION PIN CONFIGURATION (TOP VIEW) GPIO2 1 30 GPIO1 GPIO2 1 30 GPIO1 GPIO3 REFM 2 29 GPIO3 2 29 3 28 GPIO0 +VBD 3 28 GPIO0 +VBD REFP 4 27 BDGND REFM REFP 4 27 BDGND +VA AGND MXO 5 26 SDO +VA 5 26 SDO 6 25 25 24 AGND MXO 6 7 SDI SCLK 7 24 SDI SCLK AINP 8 AINM 9 ADS7950 ADS7950 ADS7954 ADS7954 ADS7958 ADS7958 23 CS AINP 8 22 AGND AINM 9 AGND NC 10 21 +VA 11 20 CH0 CH3 12 19 NC 13 CH2 NC ADS7951 ADS7951 ADS7955 ADS7955 ADS7959 ADS7959 23 CS 22 AGND AGND CH7 10 21 +VA 11 20 CH0 CH6 12 19 18 NC CH1 CH5 13 18 CH1 CH2 14 17 NC CH4 14 17 CH3 15 16 NC NC 15 16 NC Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 9 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com GPIO2 1 38 GPIO1 GPIO2 1 38 GPIO1 GPIO3 REFM 2 37 GPIO3 2 37 GPIO0 3 36 GPIO0 +VBD REFM 3 36 +VBD REFP 4 35 BDGND 4 35 BDGND +VA 5 34 SDO REFP +VA 5 34 SDO AGND MXO 6 33 AGND 6 33 7 32 SDI SCLK MXO 7 32 SDI SCLK AINP 8 31 CS AINP 8 31 CS AINM 9 30 VEE AINM 9 30 29 VCC AGND CH15 10 29 VEE VCC ADS7952 ADS7952 ADS7956 ADS7956 ADS7960 ADS7960 ADS7953 ADS7953 ADS7957 ADS7957 ADS7961 ADS7961 AGND NC 10 28 CH0 28 CH0 NC 12 27 CH14 12 27 CH1 NC 13 26 CH1 CH2 CH13 13 26 CH2 NC 14 25 CH3 14 25 CH11 CH10 15 24 CH4 CH12 CH11 15 24 CH3 CH4 16 23 CH5 CH10 16 23 CH5 CH9 17 22 CH6 CH9 17 22 CH6 CH8 AGND 18 21 CH7 CH8 18 21 CH7 19 20 AGND AGND 19 20 AGND 11 11 TERMINAL FUNCTIONS DEVICE NAME ADS7953 ADS7953 ADS7957 ADS7957 ADS7961 ADS7961 ADS7952 ADS7952 ADS7956 ADS7956 ADS7960 ADS7960 ADS7951 ADS7951 ADS7955 ADS7955 ADS7959 ADS7959 ADS7950 ADS7950 ADS7954 ADS7954 ADS7958 ADS7958 PIN NAME I/O FUNCTION PIN NO. REFERENCE 4 4 4 4 REFP I Reference input 3 3 3 3 REFM I Reference ground ADC ANALOG INPUT 8 8 8 8 AINP I Signal input to ADC 9 9 9 9 AINM I ADC input ground MULTIPLEXER 7 7 7 7 MXO O Multiplexer output 28 28 20 20 Ch0 I Analog channels for multiplexer 27 27 19 18 Ch1 I 26 26 18 14 Ch2 I 25 25 17 12 Ch3 I 24 24 14 - Ch4 I 23 23 13 - Ch5 I 22 22 12 - Ch6 I 21 21 11 - Ch7 I 18 18 - - Ch8 I 17 17 - - Ch9 I 16 16 - - Ch10 I 15 15 - - Ch11 I 14 - - - Ch12 I 13 - - - Ch13 I 12 - - - Ch14 I 11 - - - Ch15 I 23 23 CS I DIGITAL CONTROL SIGNALS 31 10 31 Submit Documentation Feedback Chip select input Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 TERMINAL FUNCTIONS (continued) DEVICE NAME ADS7953 ADS7953 ADS7957 ADS7957 ADS7961 ADS7961 ADS7952 ADS7952 ADS7956 ADS7956 ADS7960 ADS7960 32 32 33 33 34 34 ADS7951 ADS7951 ADS7955 ADS7955 ADS7959 ADS7959 ADS7950 ADS7950 ADS7954 ADS7954 ADS7958 ADS7958 PIN NAME I/O 24 24 SCLK I Serial clock input 25 25 SDI I Serial data input 26 26 SDO O Serial data output FUNCTION PIN NO. GENERAL PURPOSE INPUTS / OUTPUTS: These pins have programmable dual functionality. Refer to Table 8 for functionality programming 37 37 29 29 1 1 1 1 2 2 2 2 Active high output indicating high alarm or high/low alarm depending on programming GPIO1 I/O General purpose input or output O Active high output indicating low alarm GPIO2 I/O General purpose input or output I GPIO3 I/O PD 30 O Range 30 General purpose input or output Low alarm 38 I/O High alarm or High/Low alarm 38 GPIO0 I Selects range: High -> Range 2 / Low -> Range 1 General purpose input or output Active low power down input POWER SUPPLY AND GROUND 5, 29 5, 29 5, 21 5, 21 +VA - Analog power supply 6, 10 19, 20, 30 6, 10 19, 20, 30 6, 10, 22 6, 10, 22 AGND - Analog ground 36 36 28 28 +VBD - Digital I/O supply 35 35 27 27 BDGND - Digital ground 11, 12, 13, 14 15, 16 11, 13, 15, 16, 17, 19 - - Pins internally not connected, do not float these pins NC PINS - Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 11 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com TYPICAL CHARATERISTICS (all ADS79XX ADS79XX Family Devices) SUPPLY CURRENT vs SUPPLY VOLTAGE STATIC SUPPLY CURRENT vs SUPPLY VOLTAGE 1.5 3.5 fS = 1 MSPS, TA = 25°C 2.5 2 1.5 +VA - Supply Current - mA 1.4 3 1.3 1.2 1.1 1 1 2.7 3.4 4.1 4.8 +VA - Supply Voltage - V 0.9 2.7 5.5 fS = 1 MSPS, VDD = 5.5 V 3.4 TA = 25°C +VA - Supply Current - mA +VA - Supply Current - mA SUPPLY CURRENT vs FREE-AIR TEMPERATURE 3.2 3 2.8 2.6 2.4 2.2 3.4 4.1 4.8 +VA - Supply Voltage - V 2 -40 5.5 15 70 TA - Free-Air Temperature - °C Figure 1. Figure 2. Figure 3. STATIC SUPPLY CURRENT vs FREE-AIR TEMPERATURE SUPPLY CURRENT vs SAMPLE RATE SUPPLY CURRENT vs SAMPLE RATE 1.115 2.5 2.5 VDD = 5.5 V No Powerdown, TA = 25°C 1.105 1.1 1.095 1.09 1.085 1.08 With Powerdown, TA = 25°C 5V 2 +VA - Supply Current - mA +VA - Supply Current - mA 1.11 +VA - Supply Current - mA 125 2.7 V 1.5 1 0.5 2 5V 1.5 2.7 V 1 0.5 1.075 1.07 -40 125 Figure 4. 12 0 0 15 70 TA - Free-Air Temperature - °C Submit Documentation Feedback 0 200 400 600 800 fS - Sample Rate - KSPS Figure 5. 1000 0 100 200 300 400 fS - Sample Rate - KSPS 500 Figure 6. Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 TYPICAL CHARACTERISTICS (12-Bit Devices Only) Variations for 10-bit and 8-bit devices are too small to be illustrated through the characteristic curves DIFFERENTIAL NONLINEARITY vs SUPPLY VOLTAGE INTEGRAL NONLINEARITY vs SUPPLY VOLTAGE DNL max 0.4 0.2 0 -0.2 DNL min -0.4 -0.6 -0.8 fS = 1 MSPS, TA = 25°C 0.8 0.6 DNL - Differential Nonlinearity - LSBs 0.6 -1 2.7 1 1 fS = 1 MSPS, TA = 25°C INL - Integral Nonlinearity - LSBs DNL - Differential Nonlinearity - LSBs 1 0.8 DIFFERENTIAL NONLINEARITY vs FREE-AIR TEMPERATURE INL max 0.4 0.2 0 -0.2 INL min -0.4 -0.6 -0.8 3.2 4.2 4.7 3.7 +VA - Supply Voltage - V 5.2 -1 2.7 5.5 3.2 3.7 4.2 4.7 +VA - Supply Voltage - V +VA = 5 V, +VBD = 5 V, fS = 1 MSPS 0.8 0.6 DNL max 0.4 0.2 0 -0.2 DNL min -0.4 -0.6 -0.8 -1 -40 5.2 15 70 TA - Free-Air Temperature - °C 125 Figure 7. Figure 8. Figure 9. INTEGRAL NONLINEARITY vs FREE-AIR TEMPERATURE OFFSET ERROR vs SUPPLY VOLTAGE OFFSET ERROR vs INTERFACE SUPPLY VOLTAGE 1 +VBD = 1.8 V, fS = 1 MSPS, TA = 25°C 1.8 1.6 INL max 0.4 0.2 0 -0.2 INL min -0.4 1.8 1.6 Offset Error - LSBs 0.6 2 2 +VA = 5 V, +VBD = 5 V, fS = 1 MSPS Offset Error - LSBs INL - Integral Nonlinearity - LSBs 0.8 1.4 1.2 1 0.8 0.6 +VA = 5.5 V, fS = 1 MSPS, TA = 25°C 1.4 1.2 1 0.8 0.6 -0.6 0.4 0.4 -0.8 0.2 0.2 -1 -40 15 70 TA - Free-Air Temperature - °C 0 2.7 125 3.4 4.1 4.8 +VA - Supply Voltage - V 0 1.8 5.5 2.3 2.8 3.3 3.8 4.3 4.8 +VBD - Interace Supply - V 5.3 5.5 Figure 10. Figure 11. Figure 12. GAIN ERROR vs SUPPLY VOLTAGE GAIN ERROR vs INTERFACE SUPPLY VOLTAGE OFFSET ERROR vs FREE-AIR TEMPERATURE 1 0.8 0.6 0.4 Gain Error - LSBs Gain Error - LSBs 0.6 +VBD = 1.8 V, fS = 1 MSPS, TA = 25°C 0.2 0 -0.2 -0.4 2 +VA = 5.5 V, fS = 1 MSPS, TA = 25°C 1.8 1.6 0.4 Offset Error - LSBs 1 0.8 0.2 0 -0.2 -0.4 +VA = 5.5 V, +VBD = 1.8 V, fS = 1 MSPS 1.4 1.2 1 0.8 0.6 -0.6 -0.6 0.4 -0.8 -0.8 0.2 -1 2.7 3.4 4.1 4.8 +VA - Supply Voltage - V 5.5 Figure 13. Copyright © 2008, Texas Instruments Incorporated -1 1.8 2.3 2.8 3.3 3.8 4.3 4.8 +VBD - Interace Supply - V Figure 14. 5.3 5.5 0 -40 15 70 TA - Free-Air Temperature - °C 125 Figure 15. Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 13 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com TYPICAL CHARACTERISTICS (12-Bit Devices Only) (continued) Variations for 10-bit and 8-bit devices are too small to be illustrated through the characteristic curves GAIN ERROR vs FREE-AIR TEMPERATURE SIGNAL-TO-NOISE RATIO vs SUPPLY VOLTAGE 1 SNR - Signal-to-Noise Ratio - dB 0.8 0.7 0.6 0.5 0.4 0.3 0.2 SINAD - Signal-to-Noise and Distortion - dB 72 +VA = 5.5 V, +VBD = 1.8 V, fS = 1 MSPS 0.9 Gain Error - LSBs SIGNAL-TO-NOISE + DISTORTION vs SUPPLY VOLTAGE 71.5 71 70.5 +VBD = 3 V, fS = 1 MSPS, fIN = 100 kHz TA = 25°C 70 69.5 0.1 0 -40 15 70 TA - Free-Air Temperature - °C 69 2.7 125 3.4 4.1 4.8 +VA - Supply Voltage - V 72 71.5 71 70.5 +VBD = 3 V, fS = 1 MSPS, fIN = 100 kHz TA = 25°C 70 69.5 5.5 69 2.7 3.4 4.1 4.8 +VA - Supply Voltage - V Figure 16. Figure 17. Figure 18. TOTAL HARMONIC DISTORTION vs SUPPLY VOLTAGE SPURIOUS FREE DYNAMIC RANGE vs SUPPLY VOLTAGE SIGNAL-TO-NOISE RATIO vs FREE-AIR TEMPERATURE -81 -82 -83 -84 -85 -86 +VBD = 3 V, fS = 1 MSPS, fIN = 100 kHz TA = 25°C -87 -88 -89 -90 2.7 3.4 4.1 4.8 +VA - Supply Voltage - V 5.5 90 72 +VBD = 3 V, fS = 1 MSPS, fIN = 100 kHz TA = 25°C 89 88 87 SNR - Signal-to-Noise Ratio - dB SFDR - Spurious Free Dynamic Range - dB -80 THD - Total Harmonic Distortion - 5.5 86 85 84 83 82 71.5 71 70.5 70 +VA = 5 V +VBD = 3 V, fS = 1 MSPS, fIN = 100 kHz 69.5 81 80 2.7 3.4 4.1 4.8 +VA - Supply Voltage - V 69 -40 5.5 15 70 TA - Free-Air Temperature - °C 125 Figure 20. Figure 21. SIGNAL-TO-NOISE + DISTORTION vs FREE-AIR TEMPERATURE TOTAL HARMONIC DISTORTION vs FREE-AIR TEMPERATURE SPURIOUS FREE DYNAMIC RANGE vs FREE-AIR TEMPERATURE 71.5 +VA = 5 V +VBD = 3 V, fS = 1 MSPS, fIN = 100 kHz 71 70.5 70 69.5 69 -40 15 70 TA - Free-Air Temperature - °C 125 Figure 22. 14 Submit Documentation Feedback SFDR - Spurious Free Dynamic Range - dB -80 72 THD - Total Harmonic Distortion - dB SINAD - Signal-to-Noise and Distortion - dB Figure 19. -81 -82 -83 -84 -85 -86 -87 -88 -89 -90 -40 +VA = 5 V +VBD = 3 V, fS = 1 MSPS, fIN = 100 kHz 15 70 TA - Free-Air Temperature - °C Figure 23. 125 90 89 88 87 +VA = 5 V +VBD = 3 V, fS = 1 MSPS, fIN = 100 kHz 86 85 84 83 82 81 80 -40 15 70 TA - Free-Air Temperature - °C 125 Figure 24. Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 TYPICAL CHARACTERISTICS (12-Bit Devices Only) (continued) Variations for 10-bit and 8-bit devices are too small to be illustrated through the characteristic curves SIGNAL-TO-NOISE RATIO vs INPUT FREQUENCY SIGNAL-TO-NOISE + DISTORTION vs INPUT FREQUENCY SNR - Signal-to-Noise Ratio - dB 72.5 72 71.5 71 70.5 +VA = 5 V +VBD = 3 V, fS = 1 MSPS, TA = 25°C, MXO Shorted to AINP 70 69.5 69 10 30 50 70 90 110 130 fIN - Input Frequency - KHz 150 73 -70 +VA = 5 V +VBD = 3 V, fS = 1 MSPS, TA = 25°C, MXO Shorted to AINP 72.5 72 THD - Total Harmonic Distortion - dB SINAD - Signal-to-Noise and Distortion - dB 73 TOTAL HARMONIC DISTORTION vs INPUT FREQUENCY 71.5 71 70.5 70 69.5 69 10 30 50 70 90 110 130 fIN - Input Frequency - KHz +VA = 5 V +VBD = 3 V, fS = 1 MSPS, TA = 25°C, MXO Shorted to AINP -72 -74 -76 -78 -80 -82 -84 -86 -88 -90 10 150 30 50 70 90 110 130 fIN - Input Frequency - KHz 150 Figure 26. Figure 27. SPURIOUS FREE DYNAMIC RANGE vs INPUT FREQUENCY SIGNAL-TO-NOISE + DISTORTION vs INPUT FREQUENCY (Across Different Source Resistance Values) TOTAL HARMONIC DISTORTION vs INPUT FREQUENCY (Across Different Source Resistance Values) +VA = 5 V +VBD = 3 V, fS = 1 MSPS, TA = 25°C, MXO Shorted to AINP 95 90 85 80 75 70 10 30 50 70 90 110 130 fIN - Input Frequency - KHz 150 72 -70 500 W 71.5 THD - Total Harmonic Distortion - dB 100 SINAD - Signal-to-Noise and Distortion - dB SFDR - Spurious Free Dynamic Range - dB Figure 25. 1000 W 71 10 W 70.5 70 100 W +VA = 5 V +VBD = 5 V, fS = 1 MSPS, TA = 25°C, Buffer Between MXO and AINP 69.5 69 20 40 60 80 fIN - Input Frequency - KHz +VA = 5 V +VBD = 5 V, fS = 1 MSPS, TA = 25°C, Buffer Between MXO and AINP -72 -74 -76 1000 W -78 -82 10 W -84 100 W -86 -88 -90 20 100 500 W -80 40 60 80 fIN - Input Frequency - KHz 100 Figure 29. Figure 30. SPURIOUS FREE DYNAMIC RANGE vs INPUT FREQUENCY (Across Different Source Resistance Values) DIFFERENTIAL NONLINEARITY VARIATION ACROSS CHANNELS INTEGRAL NONLINEARITY VARIATION ACROSS CHANNELS 1 88 10 W 86 100 W 84 82 80 78 76 74 72 70 20 1000 W 500 W +VA = 5 V +VBD = 5 V, fS = 1 MSPS, TA = 25°C, Buffer Between MXO and AINP 40 60 80 fIN - Input Frequency - KHz 100 Figure 31. Copyright © 2008, Texas Instruments Incorporated 0.8 0.6 +VA = 5 V, +VBD = 5 V, fS = 1 MSPS 1 0.8 INL - Integral Nonlinearity - LSBs 90 DNL - Differential Nonlinearity - LSBs SFDR - Spurious Free Dynamic Range - dB Figure 28. DNL max 0.4 0.2 0 -0.2 -0.4 DNL min -0.6 -0.8 -1 0 INL max 0.6 0.4 0.2 0 -0.2 INL min -0.4 -0.6 -0.8 5 10 Channel Number Figure 32. 15 -1 0 +VA = 5 V, +VBD = 5 V, fS = 1 MSPS 5 10 Channel Number 15 Figure 33. Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 15 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com TYPICAL CHARACTERISTICS (12-Bit Devices Only) (continued) Variations for 10-bit and 8-bit devices are too small to be illustrated through the characteristic curves OFFSET ERROR VARIATION ACROSS CHANNELS +VA = 5 V, +VBD = 5 V, fS = 1 MSPS 0.2 1.2 EG - Gain Error - LSBs EO - Offset Error - LSBs 73 0.25 +VA = 5 V, +VBD = 5 V, fS = 1 MSPS 1.4 SIGNAL-TO-NOISE RATIO VARIATION ACROSS CHANNELS 1 0.8 0.6 0.4 SNR - Signal-to-Noise Ratio - dB 1.6 GAIN ERROR VARIATION ACROSS CHANNELS 0.15 0.1 0.05 0.2 0 5 10 15 Channel Number 20 72 71.5 71 +VA = 5 V, +VBD = 5 V, fS = 1 MSPS 70.5 70 0 0 72.5 0 5 10 15 Channel Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Channel Number 20 Figure 35. Figure 36. SIGNAL-TO-NOISE + DISTORTION VARIATION ACROSS CHANNELS CROSSTALK vs INPUT FREQUENCY INPUT LEAKAGE CURRENT vs FREE-AIR TEMPERATURE 120 73 90 100 72 71.5 71 80 70 Figure 37. Submit Documentation Feedback Memory 60 40 20 70.5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Channel Number 16 100 Isolation AINP - Leakage Current - nA 72.5 +VA = 5 V, +VBD = 5 V, fS = 1 MSPS Crosstalk - dB SINAD - Signal-to-Noise and Distortion - dB Figure 34. 0 0 +VA = 5 V, +VBD = 5 V, fS = 1 MSPS, CH0, CH1 50 100 150 200 fIN - Input Frequency - KHz Figure 38. +VA = 5 V, +VBD = 5 V 80 70 60 50 VI = 0 V 40 VI = 1.25 V 30 20 VI = 2.5 V 10 250 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TA - Free-Air Temperature - °C Figure 39. Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 TYPICAL CHARACTERISTICS (12-Bit Devices Only) DNL 1 +VA = 5 V +VBD = 5 V, fS = 1 MSPS, TA = 25°C 0.8 0.6 DNL - LSBs 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 1024 2048 3072 4096 3072 4096 Code Figure 40. INL 1 +VA = 5 V, +VBD = 5 V, fS = 1 MSPS 0.8 0.6 INL - LSBs 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 1024 0 2048 Code Figure 41. FFT 0 +VA = 5 V +VBD = 5 V, fS = 1 MSPS, fIN = 100 kHz Npoints = 16384 -20 Amplitude - dB -40 -60 -80 -100 -120 -140 -160 0 100000 200000 300000 f - Frequency - Hz 400000 500000 Figure 42. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 17 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com DETAILED DESCRIPTION DEVICE OPERATION The ADS7950 ADS7950 to ADS7961 ADS7961 are 12/10/8-bit multichannel devices. Figure 43, Figure 44, Figure 45, and Figure 46 show device operation timing. Device operation is controlled with CS, SCLK, and SDI. The device outputs its data on SDO. Frame n Frame n+1 CS 1 3 5 7 9 11 13 15 16 1 3 5 7 9 11 13 15 16 SCLK SDO Top 4 bit SDI Top 4 bit 12 bit conversion result 16 bit i/p word 16 bit i/p word Mux chan change Analog i/p settling after Chan change MUX Conversion GPO Mux chan change Acquisition phase tacq Acquisition 12 bit conversion result Conversion phase Data written (thr SDI) in frame n-1 Sampling instance Conversion phase tcnv Data written (thr SDI) in frame n GPI GPI status is latched in on CSfalling edge and transferred to SDO frame n Figure 43. Device Operation Timing Diagram Each frame begins with the falling edge of CS. With the falling edge of CS, the input signal from the selected channel is sampled, and the conversion process is initiated. The device outputs data while the conversion is in progress. The 16-bit data word contains a 4-bit channel address, followed by a 12-bit conversion result in MSB first format. There is an option to read the GPIO status instead of the channel address. (Refer to Table 1, Table 2, and Table 5 for more details.) The device selects a new multiplexer channel on the second SCLK falling edge. The acquisition phase starts on the fourteenth SCLK rising edge. On the next CS falling edge the acquisition phase will end, and the device starts a new frame. The device has four General Purpose IO (GPIO) pins. These four pins can be individually programmed as GPO or GPI. It is also possible to use them for preassigned functions, refer to Table 10. GPO data can be written into the device through the SDI line. The device refreshes the GPO data on the CS falling edge as per the SDI data written in previous frame. Similarly the device latches GPI status on the CS falling edge and outputs the GPI data on the SDO line (if GPI read is enabled by writing DI04=1 in the previous frame) in the same frame starting with the CS falling edge. 18 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 a 1/t throughput (single frame) CS tw 1 tsu 1 SCLK 1 3 2 4 th 1 td 1 DO15 SDO 5 6 14 15 16 DO-0 LSB td 2 td 3 DO13 DO12 DO-11 DO-11 MSB DO-10 DO-10 MSB-1 DO-2 LSB+2 DO-1 LSB+1 DI-13 DI-13 DI-12 DI-12 DI-11 DI-11 DI-10 DI-10 DI-2 DI-1 DO14 tq tsu2 SDI DI-15 DI-15 DI-14 DI-14 DI-0 th 2 Figure 44. Serial Interface Timing Diagram for 12-Bit Devices ( ADS7950/51/52/53 ADS7950/51/52/53) a CS CS\ 1/t throughput (single frame) tw1 tsu1 SCLK 1 td1 SDO 2 th1 DO15 DO14 3 4 6 5 14 15 16 DO-0 - td2 td3 DO13 DO12 DO-11 DO-11 MSB DO-10 DO-10 MSB-1 DO-2 LSB DO-1 - DI-13 DI-13 DI-12 DI-12 DI-11 DI-11 DI-10 DI-10 DI-2 DI-1 tq tsu2 SDI DI-15 DI-15 DI-14 DI-14 DI-0 th2 Figure 45. Serial Interface Timing Diagram for 10-Bit Devices (ADS7954/55/56/57 ADS7954/55/56/57) a CS CS\ tw1 tsu1 SCLK SDO 1/t throughput (single frame) 1 td1 2 th1 DO15 DO14 3 4 5 6 12 13 16 td2 td3 DO13 DO12 DO-11 DO-11 MSB DO-10 DO-10 MSB-1 DO-4 LSB DO-3 - DO-0 - DI-13 DI-13 DI-12 DI-12 DI-11 DI-11 DI-10 DI-10 DI-4 DI-3 DI-0 tq tsu2 SDI DI-15 DI-15 DI-14 DI-14 th2 Figure 46. Serial Interface Timing Diagram for 8-Bit Devices (ADS7958/59/60/61 ADS7958/59/60/61) The falling edge of CS clocks out DO-15 DO-15 (first bit of the four bit channel address), and remaining address bits are clocked out on every falling edge of SCLK until the third falling edge. The conversion result MSB is clocked out on the 4th SCLK falling edge and LSB on the 15th/13th/11th falling edge respectively for 12/10/8-bit devices. On the 16th falling edge of SCLK, SDO goes to the 3-state condition. The conversion ends on the 16th falling edge of SCLK. The device reads a sixteen bit word on the SDI pin while it outputs the data on the SDO pin. SDI data is latched on every rising edge of SCLK starting with the 1st clock as shown in Figure 44, Figure 45, and Figure 46. CS can be asserted (pulled high) only after 16 clocks have elapsed. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 19 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com The device has two (high and low) programmable alarm thresholds per channel. If the input crosses these limits; the device flags out an alarm on GPIO0/GPIO1 depending on the GPIO program register settings (refer to Table 10). The alarm is asserted (under the alarm conditions) on the 12th falling edge of SCLK in the same frame when a data conversion is in progress. The alarm output is reset on the 10th falling edge of SCLK in the next frame. The device offers a power-down feature to save power when not in use. There are two ways to powerdown the device. It can be powered down by writing DI05 = 1 in the mode control register (refer to Table 1, Table 2, and Table 5); in this case the device powers down on the 16th falling edge of SCLK in the next data frame. Another way to powerdown the device is through GPIO. GPIO3 can act as the PD input (refer to Table 10, to assign this functionality to GPIO3). This is an asynchronous and active low input. The device powers down instantaneously after GPIO3 (PD) = 0. The device will power up again on the CS falling edge with DI05 = 0 in the mode control register and GPIO3 (PD) = 1. CHANNEL SEQUENCING MODES There are three modes for channel sequencing, namely Manual mode, Auto-1 mode, Auto-2 mode. Mode selection is done by writing into the control register (refer to Table 1, Table 2, and Table 5). A new multiplexer channel is selected on the second falling edge of SCLK (as shown in Figure 43) in all three modes. Manual mode: When configured to operate in Manual mode, the next channel to be selected is programmed in each frame and the device selects the programmed channel in the next frame. On powerup or after reset the default channel is 'Channel-0' and the device is in Manual mode. Auto-1 mode: In this mode the device scans pre-programmed channels in ascending order. A new multiplexer channel is selected every frame on the second falling edge of SCLK. There is a separate `program register' for pre-programming the channel sequence. Table 3 and Table 4 show Auto-1 `program register' settings. Once programmed the device retains `program register' settings until the device is powered down, reset, or reprogrammed. It is allowed to exit and re-enter the Auto-1 mode any number of times without disturbing `program register' settings. The Auto-1 program register is reset to FFFF/FFF/FF/F hex for the 16/12/8/4 channel devices respectively upon device powerup or reset; implying the device scans all channels in ascending order. Auto-2 mode: In this mode the user can configure the program register to select the last channel in the scan sequence. The device scans all channels from channel 0 up to and including the last channel in ascending order. The multiplexer channel is selected every frame on the second falling edge of SCLK. There is a separate `program register' for pre-programming of the last channel in the sequence (multiplexer depth). Table 6 lists the `Auto-2 prog' register settings for selection of the last channel in the sequence. Once programmed the device retains program register settings until the device is powered down, reset, or reprogrammed. It is allowed to exit and re-enter Auto-2 mode any number of times, without disturbing the `program register' settings. On powerup or reset the bits D9-D6 of the Auto-2 program register are reset to F/B/7/3 hex for the 16/12/8/4 channel devices respectively; implying the device scans all channels in ascending order. DEVICE PROGRAMMING AND MODE CONTROL The following section describes device programming and mode control. These devices feature two types of registers to configure and operate the devices in different modes. These registers are referred as `Configuration Registers'. There are two types of `Configuration Registers' namely `Mode control registers' and `Program registers'. Mode Control Register A `Mode control register' is configured to operate the device in one of three channel sequencing modes, namely Manual mode, Auto-1 Mode, Auto-2 Mode. It is also used to control user programmable features like range selection, device power-down control, GPIO read control, and writing output data into the GPIO. 20 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 Program Registers The 'Program registers' are used for device configuration settings and are typically programmed once on powerup or after device reset. There are different program registers such as `Auto-1 mode programming' for pre-programming the channel sequence, `Auto-2 mode programming' for selection of the last channel in the sequence, `Alarm programming' for all 16 channels (or 12,8,4 channels depending on the device) and GPIO for individual pin configuration as GPI or GPO or a pre-assigned function. DEVICE POWER-UP SEQUENCE The device power-up sequence is shown in Figure 47. Manual mode is the default power-up channel sequencing mode and Channel-0 is the first channel by default. As explained previously, these devices offer Program Registers to configure user programmable features like GPIO, Alarm, and to pre-program the channel sequence for Auto modes. At `powerup or on reset' these registers are set to the default values listed in Table 1 to Table 10. It is recommended to program these registers on powerup or after reset. Once configured; the device is ready to use in any of the three channel sequencing modes namely Manual, Auto-1, and Auto-2. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 21 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com Device power up or reset Device operation in manual mode, Channel 0; SDO Invalid in first frame CS First frame CS Auto 1 register program (note 1) CS Auto 2 register program (note 1) CS Alarm register program (note 1) CS GPIO register program (note 1) CS CS Operation in Auto 1 mode Operation in manual mode CS Operation in Auto 2 mode (1) The device continues its operation in Manual mode channel 0 through out the programming sequence and outputs valid conversion results. It is possible to change channel, range, GPIO by inserting extra frames in between two programming blocks. It is also possible to bypass any programming block if the user does not intent to use that feature. (2) It is possible to reprogram the device at any time during operation, regardless of what mode the device is in. During programming the device continues its operation in whatever mode it is in and outputs valid data. Figure 47. Device Power-Up Sequence OPERATING IN MANUAL MODE The details regarding entering and running in Manual channel sequencing mode are illustrated in Figure 48. Table 1 lists the Mode Control Register settings for Manual mode in detail. Note that there are no Program Registers for manual mode. 22 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 CS Frame: n-1 Device operation in Auto 1 or Auto 2 mode No Change to Manual mode? Yes CS Frame: n Request for Manual mode CS Frame: n+1 Entry into Manual Mode CS Frame: n+2 Operation in Manual mode * Sample: Samples and converts channel selected in `frame n-1' * Mux : Selects channel incremented from previous frame as per auto sequence this channel will be acquired in this frame and sampled at start of `frame n+1' * Range: As programmed in `frame n-1' . Applies to channel selected for acquisition in current frame . * SDI : Programming for `frame n +1' DI15.12 = 0001 binary . Selects manual mode DI11=1 enables programming of `range and GPIO' DI10.7 = binary address of channel DI6. As per required range for channel to be selected DI5=0 . No power down DI4.0. as per GPIO settings *SDO : DO15.0 address (or GPIO data) & conversion data of channel selected in `frame n -1' * GPIO : 3 -1' O/P: latched on CS falling edge as per DI .0 written in frame n I/P: Input status latched on falling edge of CSand transferred serially on SDO in the same frame * Sample: Samples and converts channel selected in `frame n' * Mux : Selects channel programmed in `frame n'(Manual mode) this channel will be acquired in this frame and sampled at start of `frame n+2' * Range: As programmed in `frame n'. Applies to channel selected for acquisition in current frame .* SDI : Programming for `frame n+2' DI15.12 = 0001 binary . To continue in manual mode DI11=1 enables programming of `range and GPIO' DI10.7 = binary address of channel DI6. As per required range for channel to be selected DI5=0 . No power down DI4.0. as per GPIO settings *SDO : DO15.0 address (or GPIO data) & conversion data of channel selected in `frame n' * GPIO : 3 O/P: latched on CS falling edge as per DI .0 written in frame `n' I/P: Input status latched on falling edge of CS and transferred serially on SDO in the same frame * Sample: Samples and converts channel selected in `frame n+1' * Mux : Selects channel programmed in `frame n+1' (Manual mode), this channel will be acquired in this frame and sampled at start of `frame n+3' * Range: As programmed in `frame n+1' . Applies to channel selected for acquisition in current frame .* SDI : Programming for `frame n+3' DI15.12 = 0001 binary . Selects manual mode DI11=1 enables programming of `range and GPIO' DI10.7 = binary address of channel DI6. As per required range for channel to be selected DI5=0 . No power down DI4.0. as per GPIO settings *SDO : DO15.0 address (or GPIO data) & conversion data of channel selected in `frame n+1' * GPIO : 3 +1' O/P: latched on CS falling edge as per DI .0 written in frame n I/P: Input status latched on falling edge of CSand transferred serially on SDO in the same frame CS Continue operation in manual mode Figure 48. Entering and Running in Manual Channel Sequencing Mode Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 23 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com Table 1. Mode Control Register Settings for Manual Mode DESCRIPTION RESET STATE BITS LOGIC STATE FUNCTION DI15-12 DI15-12 0001 0001 Selects Manual Mode DI11 0 1 Enables programming of bits DI06-00 DI06-00. 0 Device retains values of DI06-00 DI06-00 from the previous frame. DI10-07 DI10-07 0000 This four bit data represents the address of the next channel to be selected in the next frame. DI10: MSB and DI07: LSB. e.g. 0000 represents channel- 0, 0001 represents channel-1 etc. DI06 0 0 Selects 2.5V i/p range (Range 1) 1 Selects 5V i/p range (Range 2) 0 Device normal operation (no powerdown) 1 Device powers down on 16th SCLK falling edge 0 SDO outputs current channel address of the channel on DO15.12 followed by 12 bit conversion result on DO11.00. DI05 DI04 0 0 1 GPIO3-GPIO0 data (both input and output) is mapped onto DO15-DO12 DO15-DO12 in the order shown below. Lower data bits DO11-DO00 DO11-DO00 represent 12-bit conversion result of the current channel. DOI5 DI03-00 DI03-00 0000 DOI4 DOI3 DOI2 GPIO3 GPIO2 GPIO1 GPIO0 GPIO data for the channels configured as output. Device will ignore the data for the channel which is configured as input. SDI bit and corresponding GPIO information is given below DI03 24 DI02 DI01 DI00 GPIO3 GPIO2 GPIO1 GPIO0 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 OPERATING IN AUTO-1 MODE The details regarding entering and running in Auto-1 channel sequencing mode are illustrated in the flowchart in Figure 49. Table 2 lists the Mode Control Register settings for Auto-1 mode in detail. CS Frame: n-1 Device operation in Manual or Auto-2 mode No Change to Auto -1 mode? Yes CS Frame: n Request for Auto-1 mode CS Frame: n+1 Entry into Auto-1 Mode CS Frame: n+2 Operation in Auto-1 mode * Sample: Samples and converts channel selected in `frame n -1' * Mux : Selects channel incremented from previous frame as per Auto -2 sequence, or channel programmed in previous frame in case of manual mode. This channel will be acquired in this frame and sampled at start of `frame n +1' * Range: As programmed in `frame n-1' . Applies to channel selected for acquisition in current frame . * SDI : Programming for `frame n+1' DI15.12 = 0010 binary . Selects Auto-1 mode DI11=1 enables programming of `range and GPIO' DI10 = x, Device automatically resets channel to lowest number in Auto -1 sequence. DI6. As per required range for channel to be selected DI5=0 . No power down DI4.0. as per GPIO settings *SDO : DO15.0 address (or GPIO data) & conversion data of channel selected in `frame n -1' * GPIO : O/P: latched on CS falling edge as per DI 3.0 written in frame n-1' I/P: Input status latched on falling edge of CS and transferred serially on SDO in the same frame * Sample: Samples and converts channel selected in `frame n' * Mux : Selects lowest channel# in Auto-1 sequence; this channel will be acquired in this frame and sampled at start of `frame n+2' * Range: As programmed in `frame n'. Applies to channel selected for acquisition in current frame . * SDI : Programming for `frame n +2' DI15.12 = 0010 binary . To continue in Auto-1 mode DI11=1 enables programming of `range and GPIO' DI10 =0, not to reset channel sequence DI6. As per required range for channel to be selected DI5=0 . No power down DI4.0. as per GPIO settings *SDO : DO15.0 address (or GPIO data) & conversion data of channel selected in `frame n' * GPIO : O/P: latched on CS falling edge as per DI 3.0 written in frame `n' I/P: Input status latched on falling edge of CS and transferred serially on SDO in the same frame * Sample: Samples and converts channel selected in `frame n+1' (ie. Lowest channel# in Auto-1 sequence) * Mux : Selects next higher channel in Auto -1 sequence, this channel will be acquired in this frame and sampled at start of `frame n +3' * Range: As programmed in `frame n . Applies to channel selected for acquisition in current frame +1' .* SDI : Programming for `frame n+3' DI15.12 = 0010 binary . To continue in Auto-1 mode DI11=1 enables programming of `range and GPIO' DI10 =0 not to reset channel sequence DI6. As per required range for channel to be selected DI5=0 . No power down DI4.0. as per GPIO settings *SDO : DO15.0 address (or GPIO data) & conversion data of channel selected in `frame n+1' * GPIO : O/P: latched on CS falling edge as per DI3.0 written in frame n+1' I/P: Input status latched on falling edge of CS and transferred serially on SDO in the same frame CS Continue operation in Auto -1 mode Figure 49. Entering and Running in Auto-1 Channel Sequencing Mode Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 25 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com Table 2. Mode Control Register Settings for Auto-1 Mode DESCRIPTION RESET STATE BITS LOGIC STATE FUNCTION DI15-12 DI15-12 0001 0010 Selects Auto-1 Mode DI11 0 1 Enables programming of bits DI10-00 DI10-00. 0 Device retains values of DI10-00 DI10-00 from previous frame. DI10 0 1 The channel counter is reset to the lowest programmed channel in the Auto-1 Program Register 0 The channel counter increments every conversion (No reset) DI09-07 DI09-07 000 xxx Do not care DI06 0 0 Selects 2.5V i/p range (Range 1) 1 Selects 5V i/p range (Range 2) 0 Device normal operation (no powerdown) 1 Device powers down on the 16th SCLK falling edge 0 SDO outputs current channel address of the channel on DO15.12 followed by 12-bit conversion result on DO11.00. DI05 0 DI04 0 1 GPIO3-GPIO0 data (both input and output) is mapped onto DO15-DO12 DO15-DO12 in the order shown below. Lower data bits DO11-DO00 DO11-DO00 represent 12-bit conversion result of the current channel. DO15 DI03-00 DI03-00 0000 DO14 DO13 DO12 GPIO3 GPIO2 GPIO1 GPIO0 GPIO data for the channels configured as output. Device will ignore the data for the channel which is configured as input. SDI bit and corresponding GPIO information is given below DI03 DI01 DI00 GPIO3 26 DI02 GPIO2 GPIO1 GPIO0 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 The Auto-1 Program Register is programmed (once on powerup or reset) to pre-select the channels for the Auto-1 sequence. Auto-1 Program Register programming requires two CS frames for complete programming. In the first CS frame the device enters the Auto-1 register programming sequence and in the second frame it programs the Auto-1 Program Register. Refer to Table 2, Table 3, and Table 4 for complete details. CS Device in any operation mode No Program Auto 1 register? Yes SDI: DI15.12 = 1000 (Device enters Auto 1 programming sequence) CS Entry into Auto 1 register programming sequence CS SDI: DI15.0 as per tables 4,5 Auto 1 register programming End of Auto 1 register programming NOTE: The device continues its operation in selected mode during programming. SDO is valid, however it is not possible to change the range or write GPIO data into the device during programming. Figure 50. Auto-1 Register Programming Flowchart Table 3. Program Register Settings for Auto-1 Mode DESCRIPTION RESET STATE BITS LOGIC STATE FUNCTION FRAME 1 DI15-12 DI15-12 NA 1000 DI11-00 DI11-00 NA Do not care Device enters Auto-1 program sequence. Device programming is done in the next frame. All 1s 1 (individual bit) FRAME 2 DI15-00 DI15-00 A particular channel is programmed to be selected in the channel scanning sequence. The channel numbers are mapped one-to-one with respect to the SDI bits; e.g. DI15 Ch15, DI14 Ch14 . DI00 Ch00 A particular channel is programmed to be skipped in the channel scanning sequence. The channel numbers are mapped one-to-one with respect to the SDI bits; e.g. DI15 Ch15, DI14 Ch14 . DI00 Ch00 0 (individual bit) Table 4. Mapping of Channels to SDI Bits for 16,12,8,4 Channel Devices Device (1) SDI BITS DI15 DI14 DI13 DI12 DI11 DI10 DI09 DI08 DI07 DI06 DI05 DI04 DI03 DI02 DI01 DI00 16 Chan 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 12 Chan X X X X 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 8 Chan X X X X X X X X 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 4 Chan X X X X X X X X X X X X 1/0 1/0 1/0 1/0 (1) When operating in Auto-1 mode, the device only scans the channels programmed to be selected. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 27 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com OPERATING IN AUTO-2 MODE The details regarding entering and running in Auto-2 channel sequencing mode are illustrated in Figure 51. Table 5 lists the Mode Control Register settings for Auto-2 mode in detail. CS Frame: n-1 Device operation in Manual or Auto -1 mode No Change to Auto- 2 mode ? Yes CS Frame: n Request for Auto-2 mode CS Frame: n+1 Entry into Auto-2 Mode CS Frame: n+2 Operation in Auto-2 mode * Sample: Samples and converts channel selected in `frame n-1' * Mux : Selects channel incremented from previous frame as per Auto-1 sequence, or channel programmed in previous frame in case of manual mode. This channel will be acquired in this frame . and sampled at start of `frame n +1' * Range: As programmed in `frame n-1'. Applies to channel selected for acquisition in current frame . * SDI : Programming for `frame n+1' DI15.12 = 0011 binary . Selects Auto-2 mode DI11=1 enables programming of `range and GPIO' DI10 = x, Device automatically resets to channel 0. DI6. As per required range for channel to be selected DI5=0 . No power down DI4.0. as per GPIO settings *SDO : DO15.0 address(or GPIO data) & conversion data of channel selected in `frame n -1' * GPIO : O/P: latched on CS falling edge as per DI 3.0 written in frame n -1' I/P: Input status latched on falling edge of CS and transferred serially on SDO in the same frame * Sample: Samples and converts channel selected in `frame n' * Mux : Selects channel0 (Auto-2 sequence always starts with Ch -0); this channel will be acquired in this frame and sampled at start of `frame n+2' * Range: As programmed in `frame n'. Applies to channel selected for acquisition in current frame . * SDI : Programming for `frame n +2' DI15.12 = 0011 binary . To continue in Auto -2 mode DI11=1 enables programming of `range and GPIO' DI10 =0, not to reset channel sequence DI6. As per required range for channel to be selected DI5=0 . No power down DI4.0. as per GPIO settings *SDO : DO15.0 address(or GPIO data) & conversion data of channel selected in `frame n' * GPIO : O/P: latched on CS falling edge as per DI 3.0 written in frame `n' I/P: Input status latched on falling edge of CS and transferred serially on SDO in the same frame * Sample: Samples and converts channel 0 * Mux : Selects next higher channel in Auto -2 sequence, this channel will be acquired in this frame and sampled at start of `frame n+3' * Range: As programmed in `frame n+1'. Applies to channel selected for acquisition in current frame .* SDI : Programming for `frame n+3' DI15.12 = 0011 binary . To continue in Auto -2 mode DI11=1 enables programming of `range and GPIO' DI10 =0 not to reset channel sequence DI6. As per required range for channel to be selected DI5=0 . No power down DI4.0. as per GPIO settings *SDO : DO15.0 address(or GPIO data) & conversion data of channel selected in `frame n+1' * GPIO : O/P: latched on CS falling edge as per DI 3.0 written in frame n+1' I/P: Input status latched on falling edge of CS and transferred serially on SDO in the same frame CS Continue operation in Auto-2 mode Figure 51. Entering and Running in Auto-2 Channel Sequencing Mode 28 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 Table 5. Mode Control Register Settings for Auto-2 Mode DESCRIPTION RESET STATE BITS LOGIC STATE FUNCTION DI15-12 DI15-12 0001 0011 Selects Auto-2 Mode DI11 0 1 Enables programming of bits DI10-00 DI10-00. 0 Device retains values of DI10-00 DI10-00 from the previous frame. DI10 0 1 Channel number is reset to Ch-00. 0 Channel counter increments every conversion.(No reset). DI09-07 DI09-07 000 xxx Do not care DI06 0 0 Selects 2.5V i/p range (Range 1) 1 Selects 5V i/p range (Range 2) 0 Device normal operation (no powerdown) 1 Device powers down on the 16th SCLK falling edge 0 SDO outputs the current channel address of the channel on DO15.12 followed by the 12-bit conversion result on DO11.00. DI05 0 DI04 0 1 GPIO3-GPIO0 data (both input and output) is mapped onto DO15-DO12 DO15-DO12 in the order shown below. Lower data bits DO11-DO00 DO11-DO00 represent the 12-bit conversion result of the current channel. DO15 DI03-00 DI03-00 0000 DO14 DO13 DO12 GPIO3 GPIO2 GPIO1 GPIO0 GPIO data for the channels configured as output. Device ignores data for the channel which is configured as input. SDI bit and corresponding GPIO information is given below DI03 DI02 DI01 DI00 GPIO3 GPIO2 GPIO1 GPIO0 The Auto-2 Program Register is programmed (once on powerup or reset) to pre-select the last channel (or sequence depth) in the Auto-2 sequence. Unlike Auto-1 Program Register programming, Auto-2 Program Register programming requires only 1 CS frame for complete programming. See Figure 52 and Table 6 for complete details. CS Device in any operation mode No Program Auto 2 register? Yes CS SDI: Di15.12 = 1001 DI9.6 = binary address of last channel in the sequence refer tables 6 Auto 2 register programming End of Auto 2 register programming NOTE: The device continues its operation in the selected mode during programming. SDO is valid, however it is not possible to change the range or write GPIO data into the device during programming. Figure 52. Auto-2 Register Programming Flowchart Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 29 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com Table 6. Program Register Settings for Auto-2 Mode RESET STATE BITS DESCRIPTION LOGIC STATE FUNCTION DI15-12 DI15-12 NA 1001 DI11-10 DI11-10 NA Do not care Auto-2 program register is selected for programming DI09-06 DI09-06 NA aaaa DI05-00 DI05-00 NA Do not care This 4-bit data represents the address of the last channel in the scanning sequence. During device operation in Auto-2 mode, the channel counter starts at CH-00 CH-00 and increments every frame until it equals "aaaa". The channel counter roles over to CH-00 CH-00 in the next frame. CONTINUED OPERATION IN A SELECTED MODE Once a device is programmed to operate in one of the modes, the user may want to continue operating in the same mode. Mode Control Register settings to continue operating in a selected mode are detailed in Table 7. Table 7. Continued Operation in a Selected Mode RESET STATE BITS DESCRIPTION LOGIC STATE FUNCTION DI15-12 DI15-12 0001 0000 The device continues to operate in the selected mode. In Auto-1 and Auto-2 modes the channel counter increments normally, whereas in the Manual mode it continues with the last selected channel. The device ignores data on DI11-DI00 DI11-DI00 and continues operating as per the previous settings. This feature is provided so that SDI can be held low when no changes are required in the Mode Control Register settings. DI11-00 DI11-00 All '0' Device ignores these bits when DI15-12 DI15-12 is set to 0000 logic state PROGRAMMING ALARM THRESHOLDS There are two Alarm Program Registers per channel, one for setting the high alarm threshold and the other for setting the low alarm threshold. For ease of programming, two alarm programming registers per channel, corresponding to four consecutive channels, are assembled into one group (a total eight registers). There are four such groups for 16 channel devices and 3/2/1 such groups for 12/8/4 channel devices respectively. The grouping of the various channels for each device in the ADS79XX ADS79XX family is listed in Table 8. The details regarding programming the alarm thresholds are illustrated in the flowchart in Figure 53. Table 9 lists the details regarding the Alarm Program Register settings. Table 8. Grouping of Alarm Program Registers GROUP NO. REGISTERS APPLICABLE FOR DEVICE 0 High and low alarm for channel 0, 1, 2, and 3 ADS7953 ADS7953.50, ADS7957 ADS7957.54, ADS7961 ADS7961.58 1 High and low alarm for channel 4, 5, 6, and 7 ADS7953 ADS7953.51, ADS7957 ADS7957.55, ADS7961 ADS7961.59 2 High and low alarm for channel 8, 9, 10, and 11 ADS7953 ADS7953 and 52, ADS7957 ADS7957 and 56, ADS7961 ADS7961 and 60 3 High and low alarm for channel 12, 13, 14, and 15 ADS7953 ADS7953, ADS7957 ADS7957, ADS7961 ADS7961 Each alarm group requires 9 CS frames for programming their respective alarm thresholds. In the first frame the device enters the programming sequence and in each subsequent frame it programs one of the registers from the group. The device offers a feature to program less than eight registers in one programming sequence. The device exits the alarm threshold programming sequence in the next frame after it encounters the first `Exit Alarm Program' bit high. 30 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 CS Device in any operation mode No Program alarm thresholds? Yes SDI: DI15.12 = 11XX (xx indicates group of four channels; refer table 8) Device enters alarm register programming sequence CS Entry into alarm register programming sequence CS SDI: DI15.0 as per table 8 (program alarm thresholds) Alarm register programming sequence No Yes DI12 = 1? No Program another group of four channels? No End of alarm programing NOTE: The device continues its operation in selected mode during programming. SDO is valid, however it is not possible to change the range or write GPIO data into the device during programming. Figure 53. Alarm Program Register Programming Flowchart Table 9. Alarm Program Register Settings DESCRIPTION BITS RESET STATE LOGIC STATE FUNCTION FRAME 1 DI15-12 DI15-12 NA 1100 Device enters `alarm programming sequence' for group 0 1101 Device enters `alarm programming sequence' for group 1 1110 Device enters `alarm programming sequence' for group 2 1111 Device enters `alarm programming sequence' for group 3 Note: DI15-12 DI15-12 = 11bb is the alarm programming request for group bb. Here `bb' represents the alarm programming group number in binary format. DI11-14 DI11-14 NA Do not care FRAME 2 AND ONWARDS Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 31 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com Table 9. Alarm Program Register Settings (continued) DESCRIPTION BITS RESET STATE LOGIC STATE FUNCTION DI15-14 DI15-14 NA cc Where "cc" represents the lower two bits of the channel number in binary format. The device programs the alarm for the channel represented by the binary number "bbcc". Note that "bb" is programmed in the first frame. DI13 NA 1 High alarm register selection 0 Low alarm register selection 0 Continue alarm programming sequence in next frame 1 Exit Alarm Programming in the next frame. Note: If the alarm programming sequence is not terminated using this feature then the device will remain in the alarm programming sequence state and all SDI data will be treated as alarm thresholds. xx Do not care DI12 NA DI11-10 DI11-10 NA DI09-00 DI09-00 All ones for high This 10-bit data represents the alarm threshold. The 10-bit alarm threshold is compared with the upper 10-bit alarm register word of the 12-bit conversion result. The device sets off an alarm when the conversion result is higher (High and all zeros for Alarm) or lower (Low Alarm) than this number. low alarm register PROGRAMMING GPIO REGISTERS The device has four General Purpose Input and Output (GPIO) pins. Each of the four pins can be independently programmed as General Purpose Output (GPO) or General Purpose Input (GPI). It is also possible to use the GPIOs for some pre-assigned functions (refer to Table 10 for details). GPO data can be written into the device through the SDI line. The device refreshes the GPO data on every CS falling edge as per the SDI data written in the previous frame. Similarly, the device latches GPI status on the CS falling edge and outputs it on SDO (if GPI is read enabled by writing DI04 = 1 during the previous frame) in the same frame starting on the CS falling edge. The details regarding programming the GPIO registers are illustrated in the flowchart in Figure 54. Table 10 lists the details regarding GPIO Register programming settings. CS Device in any operation mode No Program GPIO register? Yes CS SDI: DI15.12 = 0100 Refer table 9 for DI11.00 data GPIO register programming End of GPIO register programming NOTE: The device continues its operation in selected mode during programming. SDO is valid, however it is not possible to change the range or write GPIO data into the device during programming. Figure 54. GPIO Program Register Programming Flowchart 32 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 Table 10. GPIO Program Register Settings BITS RESET STATE DESCRIPTION LOGIC STATE FUNCTION DI15-12 DI15-12 NA 0100 Device selects GPIO Program Registers for programming. DI11-10 DI11-10 00 00 Do not program these bits to any logic state other than `00' DI09 0 1 Device resets all registers in the next CS frame to the reset state shown in the corresponding tables (it also resets itself). 0 Device normal operation 1 Device configures GPIO3 as the device power-down input. 0 GPIO3 remains general purpose I or O 1 Device configures GPIO2 as device range input. 0 GPIO2 remains general purpose I or O 000 GPIO1 and GPIO0 remain general purpose I or O xx1 Device configures GPIO0 as `high or low' alarm output. This is an active high output. GPIO1 remains general purpose I or O. 010 Device configures GPIO0 as high alarm output. This is an active high output. GPIO1 remains general purpose I or O. 100 Device configures GPIO1 as low alarm output. This is an active high output. GPIO0 remains general purpose I or O. 110 Device configures GPIO1 as low alarm output and GPIO0 as a high alarm output. These are active high outputs. DI08 DI07 DI06-04 DI06-04 0 0 000 Note: The following settings are valid for GPIO which are not assigned a specific function through bits DI08.04 DI03 0 GPIO2 pin is configured as general purpose output GPIO2 pin is configured as general purpose input 1 GPIO1 pin is configured as general purpose output GPIO1 pin is configured as general purpose input 1 GPIO0 pin is configured as general purpose output 0 DI00 0 GPIO3 pin is configured as general purpose input 1 0 DI01 GPIO3 pin is configured as general purpose output 0 0 1 0 DI02 0 GPIO0 pin is configured as general purpose input Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 33 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com APPLICATION INFORMATION ANALOG INPUT The ADS79XX ADS79XX device family offers 12/10/8-bit ADCSs with 16/12/8/4 channel multiplexers for analog input. The multiplexer output is available on the MXO pin. AINP is the ADC input pin. The devices offers flexibility for a system designer as both signals are accessible esternally. Typically it is convenient to short MXO to the AINP pin so that signal input to each multiplexer channel can be processed independently. In this condition it is recommended to limit source impedance to 50 or less. Higher source impedance may affect the signal settling time after a multiplexer channel change. This condition can affect linearity and total harmonic distortion. MXO AINP GPIO 0, H Alarm Ch0 Ch1 GPIO 1, L Alarm Ch2 GPIO 2, Range GPIO 3, PD From sensors, INA etc. There is a restriction on source impedance. RSOURCE £ 50 W ADC SDO To Host SDI SCLK CS Chn* REF 10 mF REF5025 REF5025 o/p Figure 55. Typical Application Diagram Showing MXO Shorted to AINP Another option is to add a common ADC driver buffer between the MXO and AINP pins. This relaxes the restriction on source impedance to a large extent. Refer to the typical characteristics section for the effect of source impedance on device performance. The typical characteristics show that the device has respectable performance with up to 1k source impedance. This topology (including a common ADC driver) is useful when all channel signals are within the acceptable range of the ADC. In this case the user can save on signal conditioning circuit for each channel. 34 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 www.ti.com . SLAS605 SLAS605 ­ JUNE 2008 High Input impedance PGA (or non inverting buffer like THS4031 THS4031) PGA Gain Control GPIO 1, 2, 3 MXO AINP GPIO 0 H/L Alarm Ch0 Ch1 Ch2 From sensors, INA etc. Source impedance has very little effect on performance. Refer to Typical Characteristics for details. ADC SDO To Host SDI SCLK CS Chn* REF 10 mF REF5025 REF5025 o/p Figure 56. Typical Application Diagram Showing Common Buffer/PGA for all Channels When the converter samples an input, the voltage difference between AINP and AGND is captured on the internal capacitor array. The (peak) input current through the analog inputs depends upon a number of factors: sample rate, input voltage, and source impedance. The current into the ADS79XX ADS79XX charges the internal capacitor array during the sample period. After this capacitance has been fully charged, there is no further input current. When the converter goes into hold mode, the input impedance is greater than 1 G. Care must be taken regarding the absolute analog input voltage. To maintain linearity of the converter, the Ch0 . Chn and AINP inputs should be within the limits specified. Outside of these ranges, converter linearity may not meet specifications. 80 W ohm MXO Ch0 200 W ohm 3 pF AINP 5 pF 7 pF Chn 20M W ohm 3 pF Ch0 assumed to be on Chn assumed to be off Figure 57. ADC and Mux Equivalent Circuit Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 35 ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 SLAS605 SLAS605 ­ JUNE 2008 . www.ti.com REFERENCE The ADS79XX ADS79XX can operate with an external 2.5V ± 10mV reference. A clean, low noise, well-decoupled reference voltage on the REF pin is required to ensure good performance of the converter. A low noise band-gap reference like the REF5025 REF5025 can be used to drive this pin. A 10-µF ceramic decoupling capacitor is required between the REF and GND pins of the converter. The capacitor should be placed as close as possible to the pins of the device. POWER SAVING The ADS79XX ADS79XX devices offer a power-down feature to save power when not in use. There are two ways to powerdown the device. It can be powered down by writing DI05 = 1 in the Mode Control register (refer to Table 1, Table 2 and Table 5); in this case the device powers down on the 16th falling edge of SCLK in the next data frame. Another way to powerdown the device is through GPIO. GPIO3 can act as a PD input (refer to Table 10, for assigning this functionality to GPIO3). This is an asynchronous and active low input. The device powers down instantaneously after GPIO3 (PD) = 0. The device will powerup again on the CS falling edge while DI05 = 0 in the Mode Control register and GPIO3 (PD) = 1. DIGITAL OUTPUT As discussed previously in the Device Operation section, the digital output of the ADS79XX ADS79XX devices is SPI compatible. The following table lists the output codes corresponding to various analog input voltages. Table 11. Ideal Input Voltages and Output Codes for 12-Bit Devices (ADS7950/51/52/53 ADS7950/51/52/53) DESCRIPTION ANALOG VALUE DIGITAL OUTPUT Full scale range Range 1 Vref Range 2 2×Vref Least significant bit (LSB) Vref/4096 2Vref/4096 Full scale Vref ­ 1 LSB 2Vref ­ 1 LSB 1111 1111 1111 FFF Midscale Vref/2 Vref 1000 0000 0000 800 Midscale ­ 1 LSB Vref/2 ­ 1 LSB Vref ­ 1 LSB 0111 1111 1111 7FF Zero 0V 0V 0000 0000 0000 000 STRAIGHT BINARY BINARY CODE HEX CODE Table 12. Ideal Input Voltages and Output Codes for 10-Bit Devices (ADS7954/55/56/57 ADS7954/55/56/57) DESCRIPTION ANALOG VALUE DIGITAL OUTPUT Full scale range Range 1 Vref Range 2 2×Vref Least significant bit (LSB) Vref/1024 2Vref/1024 Full scale Vref ­ 1 LSB 2Vref ­ 1 LSB 11 1111 1111 3FF Midscale Vref/2 Vref 10 0000 0000 200 Midscale ­ 1 LSB Vref/2 ­ 1 LSB Vref ­ 1 LSB 01 1111 1111 1FF Zero 0V 0V 00 0000 0000 000 STRAIGHT BINARY BINARY CODE HEX CODE Table 13. Ideal Input Voltages and Output Codes for 8-Bit Devices (ADS7958/59/60/61 ADS7958/59/60/61) DESCRIPTION ANALOG VALUE DIGITAL OUTPUT Full scale range Range 1 Vref Range 2 2×Vref Least significant bit (LSB) Vref/256 2Vref/256 Full scale Vref ­ 1 LSB 2Vref ­ 1 LSB 1111 1111 FF Midscale Vref/2 Vref 1000 0000 80 Midscale ­ 1 LSB Vref/2 ­ 1 LSB Vref ­ 1 LSB 0111 1111 7F Zero 0V 0V 0000 0000 00 36 Submit Documentation Feedback STRAIGHT BINARY BINARY CODE HEX CODE Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ADS7950 ADS7950, ADS7951 ADS7951, ADS7952 ADS7952, ADS7953 ADS7953 ADS7954 ADS7954, ADS7955 ADS7955, ADS7956 ADS7956, ADS7957 ADS7957 ADS7958 ADS7958, ADS7959 ADS7959, ADS7960 ADS7960, ADS7961 ADS7961 PACKAGE OPTION ADDENDUM www.ti.com 11-Jul-2008 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty ADS7950SBDBT ADS7950SBDBT ACTIVE TSSOP DBT 30 60 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR ADS7950SBDBTG4 ADS7950SBDBTG4 ACTIVE TSSOP DBT 30 60 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR ADS7950SBDBTR ADS7950SBDBTR ACTIVE TSSOP DBT 30 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR ADS7950SBDBTRG4 ADS7950SBDBTRG4 ACTIVE TSSOP DBT 30 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR ADS7950SDBT ADS7950SDBT ACTIVE TSSOP DBT 30 60 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR ADS7950SDBTG4 ADS7950SDBTG4 ACTIVE TSSOP DBT 30 60 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR ADS7950SDBTR ADS7950SDBTR ACTIVE TSSOP DBT 30 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR ADS7950SDBTRG4 ADS7950SDBTRG4 ACTIVE TSSOP DBT