10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX
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19-2125; 7/03
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface
MAX5721 dual 10-bit, low-power, buffered voltageoutput, digital-to-analog converter (DAC) packaged space-saving 8-pin µMAX package (5mm 3mm). wide supply voltage range +2.7V +5.5V 112µA supply current accommodate low-power low-voltage applications. outputs employ on-chip precision output amplifiers that swing Rail-to-Rail®. MAX5721's reference input accepts voltage range from VDD. power-down reference input high impedance, further reducing system's total power consumption. 20MHz, 3-wire SPITM, QSPITM, MICROWIREand DSP-compatible serial interface saves board space reduces complexity opto- transformerisolated applications. MAX5721 on-chip power-on reset (POR) circuit resets outputs zero loads output with 100k resistor ground. This provides additional safety applications that drive valves other transducers that need power-up. MAX5721's software-controlled powerdown reduces supply current less than 0.3µA provides software-selectable output loads (1k, 100k, high impedance) while power-down. MAX5721 specified over -40°C +125°C automotive temperature range Ultra-Low Power Consumption 112µA +3.6V 135µA +5.5V Wide +2.7V +5.5V Single-Supply Range Tiny 8-Pin µMAX Package 0.3µA Power-Down Current Guaranteed 10-Bit Monotonicity (±1LSB DNL) Safe Power-Up Reset Zero Volts Output Three Software Selectable Power-Down Impedances (100k, Hi-Z) Fast 20MHz, 3-Wire SPI, QSPI, MICROWIRECompatible Serial Interface Rail-to-Rail Output Buffer Amplifiers Schmitt-Triggered Logic Inputs Direct Interface Optocouplers Wide -40°C +125°C Operating Temperature Range
Features
MAX5721
Applications
Automatic Tuning Gain Offset Adjustment Power Amplifier Control Process Control Boards Battery-Powered Instruments Control
VIEW
Ordering Information
PART MAX5721EUA MAX5721AUA TEMP RANGE -40°C +85°C -40°C +125°C PIN-PACKAGE µMAX µMAX
Configuration
Functional Diagram appears data sheet. Rail-to-Rail registered trademark Nippon Motorola, Inc. QSPI trademarks Motorola, Inc. MICROWIRE trademark National Semiconductor, Corp.
OUTB OUTA
MAX5721
SCLK
µMAX
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5721
ABSOLUTE MAXIMUM RATINGS
.-0.3V OUT_, SCLK, DIN, GND.-0.3 (VDD+0.3V) Maximum Continuous Current Into Pin.±50mA Continuous Power Dissipation +70°C) 8-Pin µMAX (derate mW/°C above +70°C) .362mW Operating Temperature Range .-40°C +125°C Junction Temperature .+150°C Storage Temperature Range .-65°C +150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD +2.7V +5.5V, VREF VDD, 200pF, TMIN TMAX, unless otherwise noted. Typical values +5V, +25°C.)
PARAMETER STATIC ACCURACY (Note Resolution Intergral Nonlinearity Error Differential Nonlinearity Error Zero-Code Error Zero-Code Error Tempco Gain Error Gain-Error Tempco Power-Supply Rejection Ratio REFERENCE INPUT Reference Input Voltage Range Reference Input Impedance Reference-Down Reference Current OUTPUT Output Voltage Range Output Impedance Short-Circuit Current Wake-Up Time Output Leakage Current load (Note Code Power-down mode output high impedance VREF RREF operation power-down mode power-down mode (Note PSRR Code hex, ±10% Code 0.26 58.8 (Note Guaranteed monotonic (Note Code ±0.5 Bits ppm/°C ppm/°C SYMBOL CONDITIONS UNITS
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(VDD +2.7V +5.5V, VREF VDD, 200pF, TMIN TMAX, unless otherwise noted. Typical values +5V, +25°C.)
PARAMETER DIGITAL INPUTS (SCLK, DIN, Input High Voltage Input Voltage Input Leakage Current Input Capacitance DYNAMIC PERFORMANCE Voltage-Output Slew Rate Voltage-Output Settling Time Digital Feedthrough Digital-Analog Glitch Inpulse DAC-to-DAC Crosstalk POWER REQUIREMENTS Supply Voltage Range Supply Current with Load Power-Down Supply Current IDDPD digital inputs 3.6V digital inputs 5.5V digital inputs 5.5V 0.29 (Note digital inputs from Major carry transition (code code hex) V/µs nV-s nV-s nV-s +3V, +3V, Digital inputs ±0.1 SYMBOL CONDITIONS UNITS
MAX5721
TIMING CHARACTERISTICS
(VDD 2.7V 5.5V, TMIN TMAX, unless otherwise noted.)
PARAMETER SCLK Clock Frequency SCLK Pulse Width High SCLK Pulse Width Fall SCLK Rise Setup Time SCLK Fall Rise Setup Time SCLK Fall Setup Time SCLK Fall Hold Time Pulse Width High SYMBOL SCLK tCSS tCSH tCSW CONDITIONS UNITS
Note Note Note Note Note
specifications tested without output loads. Linearity guaranteed from code code 995. Limited with test conditions. Offset gain error limit FSR. Guaranteed design.
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5721
_Typical Operating Characteristics
(VREF VDD, +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY CODE, +25°C
MAX5721 toc01
DIFFERENTIAL NONLINEARITY CODE, +25°C
0.20 0.15 0.10 (LSB) 0.05 -0.05 -0.10 -0.15 -0.20 -0.25 CODE 1024
MAX5721 toc02
TOTAL UNADJUSTED ERROR CODE, +25°C
MAX5721 toc03
(LSB) CODE
0.25
TOTAL UNADJUSTED ERROR
1024
CODE
1024
INTEGRAL NONLINEARITY CODE, +40°C
MAX5721 toc04
DIFFERENTIAL NONLINEARITY CODE, -40°C
MAX5721 toc05
TOTAL UNADJUSTED ERROR CODE, -40°C
MAX5721 toc06
0.25 0.20 0.15 0.10 (LSB) 0.05 -0.05 -0.10 -0.15 -0.20 -0.25
TOTAL UNADJUSTED ERROR
(LSB)
CODE 1024
CODE 1024 CODE 1024
INTEGRAL NONLINEARITY CODE, +125°C
MAX5721 toc07
DIFFERENTIAL NONLINEARITY CODE, +125°C
0.20 0.15 0.10 (LSB) 0.05 -0.05 -0.10 -0.15 -0.20 -0.25 CODE 1024
MAX5721 toc08
TOTAL UNADJUSTED ERROR CODE, +125°C
MAX5721 toc09
(LSB) CODE
0.25
TOTAL UNADJUSTED ERROR
1024
CODE
1024
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5721
Typical Operating Characteristics (continued)
(VREF VDD, +25°C, unless otherwise noted.)
WORST-CASE TEMPERATURE
MAX5721 toc10
SOURCE-AND-SINK CURRENT CAPABILITY (VDD +3V)
MAX5721 toc11
SOURCE-AND-SINK CURRENT CAPABILITY (VDD +5V)
VOUT CODE HEX, SOURCING CURRENT FROM OUT_ CODE HEX, SINKING CURRENT INTO OUT_ CODE SINKING CURRENT INTO OUT_ CODE HEX, SOURCING CURRENT FROM OUT_
MAX5721 toc12 MAX5721 toc15
(LSB)
VOUT CODE HEX, SOURCING CURRENT FROM OUT_ CODE HEX, SINKING CURRENT INTO OUT_ CODE SINKING CURRENT INTO OUT_ CODE HEX, SOURCING CURRENT FROM OUT_
MAXIMUM
MAXIMUM
MINIMUM
MINIMUM
TEMPERATURE (°C)
ISOURCE/SINK (mA)
ISOURCE/SINK (mA)
SUPPLY CURRENT SUPPLY VOLTAGE
MAX5721 toc13
POWER-DOWN SUPPLY CURRENT SUPPLY VOLTAGE
POWER-DOWN SUPPLY CURRENT (nA)
MAX5721 toc14
SUPPLY CURRENT INPUT VOLTAGE
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA) SUPPLY VOLTAGE CODE
SUPPLY VOLTAGE
INPUT VOLTAGE
SUPPLY CURRENT TEMPERATURE
MAX5721 toc16
FULL-SCALE SETTLING TIME (VDD +5V)
MAX5721 toc17
FULL-SCALE SETTLING TIME (VDD +5V)
MAX5721 toc18
SUPPLY CURRENT (µA) +3.6V +5.5V
VSCLK 5V/div
VSCLK 5V/div
VOUT_ 1V/div CODE 200pF 1µs/div CODE 200pF 1µs/div
VOUT_ 1V/div
TEMPERATURE (°C)
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5721
Typical Operating Characteristics (continued)
(VREF VDD, +25°C, unless otherwise noted.)
HALF-SCALE SETTLING TIME (VDD +3V)
MAX5721 toc19
HALF-SCALE SETTLING TIME (VDD +3V)
MAX5721 toc20
VSCLK 5V/div
VSCLK 5V/div
VOUT_ 1V/div CODE 200pF 1µs/div CODE 200pF 1µs/div
VOUT_ 1V/div
EXITING POWER-DOWN (VDD +5V)
MAX5721 toc21
DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +5V)
VSCLK 5V/div
MAX5721 toc22
SCLK, fSCLK 500kHz 2V/div
CODE
VOUT_ 1V/div
CODE
VOUT_ AC-COUPLED, 20mV/div
5µs/div
1µs/div
DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +3V)
MAX5721 toc23
DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +5V)
SCLK, fSCLK 500kHz, 2V/div
MAX5721 toc24
SCLK, fSCLK 500kHz, 2V/div
CODE
VOUT_ AC-COUPLED, 50mV/div CODE 1µs/div
VOUT_ AC-COUPLED, 50mV/div
1µs/div
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5721
Typical Operating Characteristics (continued)
VREF VDD, +25°C, unless otherwise noted.) DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +3V) POWER-ON RESET, FAST RISE TIME (VDD +5V)
SCLK, fSCLK 500kHz, 1V/div
MAX5721 toc25
MAX5721 toc26
2V/div
CODE 1µs/div
VOUT_ AC-COUPLED, 20mV/div
RISE TIME 20µs
VOUT_ AC-COUPLED, 10mV/div
20µs/div
POWER-ON RESET, SLOW RISE TIME (VDD +5V)
POWER-ON RESET, FAST RISE TIME (VDD +3V)
2V/div RISE TIME 20µs
MAX5721 toc27
MAX5721 toc28
RISE TIME 76µs
2V/div
VOUT_ AC-COUPLED, 2mV/div
VOUT_ AC-COUPLED, 10mV/div
40µs/div
20µs/div
POWER-ON RESET, SLOW RISE TIME (VDD +3V)
CLOCK FEEDTHROUGH (VDD +5V)
MAX5721 toc30
MAX5721 toc29
2V/div RISE TIME 72µs
SCLK, 2V/div
VOUT_ AC-COUPLED, 2mV/div
VOUT_, AC-COUPLED 1mV/div
40µs/div
100ns/div fSCLK 1MHz
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5721
Typical Operating Characteristics (continued)
VREF VDD, +25°C, unless otherwise noted.)
LINE TRANSIENT RESPONSE (VDD +5V)
CLOCK FEEDTHROUGH (VDD +3V)
MAX5721 toc31
MAX5721 toc32
SCLK, 2V/div
VDD, AC-COUPLED, 100mV/div
VOUT_, AC-COUPLED 1mV/div
VOUT_ AC-COUPLED, 10mV/div
100ns/div fSCLK 1MHz
20µs/div
LINE TRANSIENT RESPONSE (VDD +3V)
CROSSTALK (VDD +5V)
MAX5721 toc34
MAX5721 toc33
VDD, AC-COUPLED, 100mV/div
VOUTA, 2V/div CODE
VOUT_ AC-COUPLED, 10mV/div
VOUTB, AC-COUPLED 1mV/div
20µs/div
4µs/div
Description
NAME SCLK OUTA, OUTB Power-Supply Input Ground Chip-Select Input Serial Clock Input Serial Data Input External Reference Voltage Input Voltage Outputs. Power-on reset sets registers zero, internally connects with 100k resistor. FUNCTION
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface
Detailed Description
MAX5721 contains 10-bit, voltage-output, lowpower digital-to-analog converters (DACs). Each employs resistor string architecture that converts 10-bit digital input word equivalent analog output voltage proportional applied reference voltage. MAX5721 shares reference input (REF) between both DACs. MAX5721 includes rail-to-rail output buffer amplifiers each DAC, input logic simple microprocessor (µP), CMOS interfaces. power-supply range from +2.7V +5.5V (Functional Diagram). MAX5721's reference input accepts voltage range from VDD. power-down mode reference input high impedance. MAX5721 compatible with 3-wire SPI, QSPI, MICROWIRE, serial interface with Schmitt-triggered logic inputs. down power-up, 8µs. This extra time needed allow internal bias wake-up. Power-down mode reduces current consumption 0.5µA.
MAX5721
3-Wire Serial Interface
MAX5721 digital interface standard 3-wire connection compatible with SPI/QSPI/MICROWIRE/DSP interfaces. chip-select input (CS) frames serial data loading DIN. Immediately following high-tolow transition, data shifted synchronously latched into input register falling edge serial clock input (SCLK). After bits have been loaded into serial input register, transfers contents latch. then either held brought high. must brought high minimum 80ns before next write sequence, since write sequence initiated falling edge keeping during first SCLK cycles discards input data. serial clock (SCLK) idle either high between transitions. MAX5721 internal registers DAC, input register register. input register holds data that waiting shifted register. Both input registers loaded without updating output. This function useul when both outputs need updated same time. input register made transparent. When input register transparent, data written into loads directly register output updated. output updated until data written register. Table list serial-interface programming commands.
Reference Input Output Range
reference input accepts positive signals. voltage sets full-scale output voltage both DACs. reference input voltage range VDD. impedance 90k. voltage vary from VDD. output voltages (VOUT_) represented digitally programmable voltage source VOUT_ (VREF where decimal equivalent binary input code ranging from 1023. VREF voltage REF.
Output Buffer Amplifiers
DACs internally buffered output. buffer amplifiers have both rail-to-rail common mode (GND VREF) output voltage range. buffers unity-gain stable with 200pF Buffer amplifiers disabled during power-up individual outputs shorted through 100k resistor. Buffer amplifiers individually altogether powereddown programming input register control bits. During power down, contents input registers remain same. wake-up outputs restored their pre-power-down voltage values.
Power-On Reset (POR)
MAX5721 internal circuit. power-up DACs powered-down OUT_ terminated through 100k resistors. Contents input registers cleared zero. recovery time after issuing wake-up command needed before writing registers. Power-down mode control commands applied immediately with recovery time. C3-C0 control bits. data bits straight binary format. bits zero. zeros correspond zero scale ones correspond full scale.
Power-Down Mode
power-down mode, outputs programmed three output states, 100k, floating (Table input high impedance typ) conserve current drain from system reference; therefore, system reference does have powered-down. outputs return values contained registers when brought power-down. recovery time, from total power-
Digital Inputs
digital inputs compatible with CMOS logic. order save power reduce input output coupling, SCLK input buffers powered down immediately after completion shifting bits into input shift register. high transition powers SCLK input buffers.
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5721
Table Power-Down Mode Control
EXTENDED CONTROL D9-D3 DATA BITS O/P, wake-up Floating output Output terminated with Output terminated with 100k O/P, wake-up Floating output Output terminated with Output terminated with 100k O/P, wake-up Floating output Output terminated with Output terminated with 100k DESCRIPTION FUNCTION
Don't Care
CONTENTS INPUT SHIFT REGISTER (MSB) (LSB)
Figure 16-Bit Input Word
SCLK tCSW tCSS tCSH
Figure Timing Diagram
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5721
Table Serial-Interface Programming Commands
CONTROL DATA BITS D9-D0 S1-S0 FUNCTION Input register transparent, data shifted directly register, OUTA updated Input register transparent, data shifted directly register, OUTB updated Data shifted input register, OUTA unchanged Data shifted input register, OUTB unchanged Shift data from input register register, OUTA updated Shift data from input register register, OUTB updated Input registers transparent, data shifted directly registers, OUTA OUTB updated Data shifted input registers, OUTA OUTB unchanged Shift data from input registers registers, OUTA OUTB updated
Don't Care
Applications Information
Unipolar Output
typical application circuit (Figure shows MAX5721 configured unipolar output, where output voltages reference inputs have same polarity. Table lists unipolar output codes.
where decimal value DACs binary input code. Table shows digital codes (offset binary) corresponding output voltages circuit Figure
Power Supply Layout Considerations
Careful board layout important optimal system performance. reduce noise injection digital feedthrough, keep analog digital signals separate. Ensure that that return path from supply ground short impedance. ground plane. Bypass with 0.1µF capacitor close possible VDD.
Bipolar Output
MAX5721 configured bipolar operation using dual supply (Figure transfer function bipolar operation VOUT VREF 1024
+2.7V +5.5V
+2.7V +5.5V
DAC_
OUT_
DAC_
OUT_
VOUT
MAX6050
MAX5721
MAX5721
Figure Typical Operating Circuit, Unipolar Output
Figure Bipolar Output Circuit
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5721
Table Unipolar Code Table
CONTENTS 1111 1111 1100 ANALOG OUTPUT
Table Bipolar Code Table
CONTENTS 1111 1111 1100 ANALOG OUTPUT
1023 VREF 1024 VREF 1024 VREF 1024 VREF 1024
VREF VREF
VREF
1000 0000 0100
1000 0000 01000 1000 0000 0000
1000 0000 0000
0111 1111 11100
0111 1111 1100
0000 0000 0100 0000 0000 0000
VREF
0000 0000 0100 0000 0000 0000
VREF
Chip Information
TRANSISTOR COUNT: 7737 PROCESS: BiCMOS
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface
Functional Diagram
MAX5721
INPUT REGISTER
REGISTER
10-BIT
OUTPUT BUFFER
OUTA
RESISTOR NETWORK
INPUT REGISTER
REGISTER
10-BIT
OUTPUT BUFFER
OUTB
INPUT CONTROL LOGIC SHIFT REGISTER
RESISTOR NETWORK POWER-DOWN CONTROL LOGIC
MAX5721
SCLK
10-Bit, Low-Power, Dual, Voltage-Output with Serial Interface
Package Information (continued)
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.)
8LUMAXD.EPS
MAX5721
INCHES 0.002 0.030 0.043 0.006 0.037
MILLIMETERS 0.05 0.75 1.10 0.15 0.95
0.50±0.1
0.6±0.1
0.6±0.1
BOTTOM VIEW
0.010 0.014 0.005 0.007 0.116 0.120 0.0256 0.116 0.120 0.188 0.198 0.016 0.026 0.0207
0.25 0.36 0.13 0.18 2.95 3.05 0.65 2.95 3.05 4.78 5.03 0.41 0.66 0.5250
VIEW
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, uMAX/uSOP
APPROVAL DOCUMENT CONTROL REV.
21-0036
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2003 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
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