12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX
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19-2124; 10/01
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface
MAX5722 dual,12-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 accommodates low-power low-voltage applications. outputs employ on-chip precision output amplifiers that swing Rail-to-Rail®. MAX5722'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, MICROWIRETM, DSP-compatible serial interface save board space reduce complexity opto- transformer-isolated applications. MAX5722 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. MAX5722's software-controlled power-down reduces supply current less than 0.3µA provides software-selectable output loads (1k, 100k, high impedance) while power-down. MAX5722 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 8-Pin µMAX Package 0.3µA Power-Down Current Guaranteed 12-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 Interfacing Optocouplers Wide -40°C +125°C Operating Temperature Range
Features
MAX5722
Applications
Automatic Tuning Gain Offset Adjustment Power Amplifier Control Process Control Boards Battery-Powered Instruments Control
VIEW
PART MAX5722EUA MAX5722AUA
Ordering Information
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
MAX5722
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.
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5722
ABSOLUTE MAXIMUM RATINGS
.-0.3V OUT_, SCLK, DIN, .-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 Integral Nonlinearity Error Differential Nonlinearity Error Zero-Code Error Zero-Code Tempco Gain Error Gain-Error Tempco Power-Supply Rejection Ratio REFERENCE INPUT Reference Input Voltage Range Reference Input Impedance Power-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 Bits ppm/°C ppm/°C SYMBOL CONDITIONS UNITS
12-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 Impulse 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) 0.15 V/µs nV-s nV-s nV-s +3V, +3V, Digital inputs ±0.1 SYMBOL CONDITIONS UNITS
MAX5722
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 3981. Limited with test conditions. Offset gain error limit FSR. Guaranteed design.
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5722
Typical Operating Characteristics
(VREF VDD, +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY CODE, +25°C
MAX5722 toc01
DIFFERENTIAL NONLINEARITY CODE, +25°C
MAX5722 toc02
TOTAL UNADJUSTED ERROR CODE, +25°C
-0.2 -0.4 -0.6 1024 1536 2048 2560 3072 3584 4096 CODE
MAX5722 toc03
(LSB)
(LSB) -0.2 -0.4
TOTAL UNADJUSTED ERROR
-0.6 -0.8 -1.0
1024 1536 2048 2560 3072 3584 4096 CODE
1024 1536 2048 2560 3072 3584 4096 CODE
INTEGRAL NONLINEARITY CODE, -40°C
MAX5722 toc04
DIFFERENTIAL NONLINEARITY CODE, -40°C
MAX5722 toc05
TOTAL UNADJUSTED ERROR CODE, -40°C
-0.2 -0.4 -0.6 1024 1536 2048 2560 3072 3584 4096 CODE
MAX5722 toc06
(LSB) -0.2 -0.4 -0.6
TOTAL UNADJUSTED ERROR
(LSB)
-0.8 1024 1536 2048 2560 3072 3584 4096 CODE -1.0 1024 1536 2048 2560 3072 3584 4096 CODE
INTEGRAL NONLINEARITY CODE, +125°C
MAX5722 toc07
DIFFERENTIAL NONLINEARITY CODE, +125°C
MAX5722 toc08
TOTAL UNADJUSTED ERROR CODE, +125°C
-0.2 -0.4 -0.6 1024 1536 2048 2560 3072 3584 4096 CODE
MAX5722 toc09
(LSB) -0.2 -0.4
TOTAL UNADJUSTED ERROR
(LSB)
-0.6 -0.8 -1.0
1024 1536 2048 2560 3072 3584 4096 CODE
1024 1536 2048 2560 3072 3584 4096 CODE
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5722
Typical Operating Characteristics (continued)
(VREF VDD, +25°C, unless otherwise noted.)
WORST CASE TEMPERATURE
MAX5722 toc10
SOURCE-AND-SINK CURRENT CAPABILITY (VDD +3V)
MAX5722 toc11
SOURCE-AND-SINK CURRENT CAPABILITY (VDD +5V)
VOUT CODE HEX, SOURCING CURRENT FROM OUT_ CODE HEX, SINKING CURRENT INTO OUT_ CODE HEX, SINKING CURRENT INTO OUT_ CODE HEX, SOURCING CURRENT FROM OUT_
MAX5722 toc12 MAX5722 toc15
(LSB) MAXIMUM
VOUT CODE HEX, SOURCING CURRENT FROM OUT_ CODE HEX, SINKING CURRENT INTO OUT_ CODE HEX, SINKING CURRENT INTO OUT_ CODE HEX, SOURCING CURRENT FROM OUT_
MAXIMUM
MINIMUM MINIMUM
TEMPERATURE (°C)
ISOURCE/SINK (mA)
ISOURCE/SINK (mA)
SUPPLY CURRENT SUPPLY VOLTAGE
MAX5722 toc13
POWER-DOWN SUPPLY CURRENT SUPPLY VOLTAGE
POWER-DOWN SUPPLY CURRENT (nA)
MAX5722 toc14
SUPPLY CURRENT INPUT VOLTAGE
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA) CODE SUPPLY VOLTAGE
SUPPLY VOLTAGE INPUT VOLTAGE
SUPPLY CURRENT TEMPERATURE
MAX5722 toc16
FULL-SCALE SETTLING TIME (VDD +5V)
SUPPLY CURRENT (µA)
MAX5722 toc17
FULL-SCALE SETTLING TIME (VDD +5V)
MAX5722 toc18
VSCLK 5V/div
VSCLK 5V/div
CODE 200pF 1µs/div
VOUT_ 1V/div
CODE 200pF
VOUT_ 1V/div
1µs/div
TEMPERATURE (°C)
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5722
Typical Operating Characteristics (continued)
(VREF VDD, +25°C, unless otherwise noted.)
HALF-SCALE SETTLING TIME (VDD +3V)
MAX5722 toc19
HALF-SCALE SETTLING TIME (VDD +3V)
MAX5722 toc20
VSCLK 5V/div
VSCLK 5V/div
CODE 200pF
VOUT_ 1V/div
CODE 200pF
VOUT_ 1V/div
1µs/div
1µs/div
EXITING POWER-DOWN (VDD +5V)
MAX5722 toc21
DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +5V)
VSCLK 5V/div
MAX5722 toc22
SCLK, fSCLK 500kHz 2V/div
CODE
VOUT_ 1V/div
VOUT_ AC-COUPLED, CODE 20mV/div
5µs/div
1µs/div
DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +3V)
MAX5722 toc23
DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +5V)
SCLK, fSCLK 500kHz, 2V/div
MAX5722 toc24
SCLK, fSCLK 500kHz, 2V/div
VOUT_
AC-COUPLED,
VOUT_
AC-COUPLED,
CODE
50mV/div CODE
50mV/div
1µs/div
1µs/div
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5722
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
MAX5722 toc25
MAX5722 toc26
2V/div
VOUT_
AC-COUPLED,
VOUT_ RISE TIME 20µs
AC-COUPLED,
CODE
20mV/div
10mV/div
1µs/div
20µs/div
POWER-ON RESET, SLOW RISE TIME (VDD +5V)
POWER-ON RESET, FAST RISE TIME (VDD +3V)
MAX5722 toc28
MAX5722 toc27
RISE TIME 76µs
2V/div RISE TIME 20µs
2V/div
VOUT_
AC-COUPLED,
VOUT_
AC-COUPLED,
2mV/div
10mV/div
40µs/div
20µs/div
POWER-ON RESET, SLOW RISE TIME (VDD +3V)
MAX5722 toc29
CLOCK FEEDTHROUGH (VDD +5V)
2V/div
MAX5722 toc30
fSCLK 1MHz SCLK 2V/div RISE TIME 72µs
VOUT_
AC-COUPLED,
VOUT_
AC-COUPLED,
2mV/div
1mV/div
40µs/div
100ns/div
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5722
Typical Operating Characteristics (continued)
(VREF VDD, +25°C, unless otherwise noted.)
CLOCK FEEDTHROUGH (VDD +3V) LINE TRANSIENT RESPONSE (VDD +5V)
SCLK 2V/div
MAX5722 toc31
MAX5722 toc32
fSCLK 1MHz VDD,
AC-COUPLED, 100mV/div
VOUT_
AC-COUPLED,
VOUT_
AC-COUPLED,
1mV/div
10mV/div
100ns/div
20µs/div
LINE TRANSIENT RESPONSE (VDD +3V)
MAX5722 toc33
CROSSTALK (VDD +5V)
VDD,
AC-COUPLED, 100mV/div
MAX5722 toc34
VOUTA 2V/div
VOUT_
AC-COUPLED,
VOUTB AC-COUPLED, 1mV/div CODE
10mV/div
20µs/div
4µs/div
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface
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 register zero, internally connects with 100k resistor. FUNCTION
MAX5722
Detailed Description
MAX5722 contains 12-bit, voltage-output, lowpower, digital-to-analog converters (DACs). Each employs resistor string architecture that converts 12-bit digital input word equivalent analog output voltage proportional applied reference voltage. MAX5722 shares reference input (REF) between both DACs. MAX5722 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). MAX5722's reference input accepts voltage range from VDD. power-down mode reference input high impedance. MAX5722 compatible with 3-wire SPI, QSPI, MICROWIRE, serial interface with Schmitt-triggered logic inputs.
(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 powered-down programming input register control bits. During power-down, contents input registers remain same. wake-up, outputs restored their prepower-down voltage values.
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 powerdown power-up, 8µs. This extra time needed allow internal bias wake-up. Power-down mode reduces current consumption 0.3µA.
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 4095. VREF voltage REF.
3-Wire Serial Interface
MAX5722 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
Output Buffer Amplifiers
DACs internally buffered output. buffer amplifiers have both rail-to-rail common mode
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5722
Table Power-Down Mode Control
EXTENDED CONTROL D11-D5 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
write sequence initiated falling edge keeping during first SCLK cycles discards input data. serial clock (SCLK) idle either high between transitions. Table lists serial-interface programming commands.
Applications Information
Unipolar Output
typical application circuit (Figure shows MAX5722 configured unipolar output, where output voltages reference inputs have same polarity. Table lists unipolar output codes.
Power-On Reset (POR)
MAX5722 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. zeros correspond zero scale ones correspond full scale.
Bipolar Output
MAX5722 configured bipolar operation using dual supply (Figure transfer function bipolar operation VOUT VREF 4096 where decimal value DACs binary input code. Table shows digital codes (offset binary) corresponding output voltages circuit Figure
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.
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5722
CONTENTS SHIFT REGISTER (MSB) (LSB)
Figure 16-Bit Input Word
SCLK
tCSW
tCSS
tCSH
Figure Timing Diagram
+2.7V +5.5V
+2.7V +5.5V
DAC_
VOUT OUT_
OUT_
DAC_
MAX6050
MAX5722
MAX5722
Figure Typical Operating Circuit, Unipolar Output
Figure Bipolar Output Circuit
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5722
Table Serial-Interface Programming Commands
CONTROL DATA BITS D11-D00 FUNCTION Shift through reg, updated Shift through reg, updated Shift through reg, unchanged Shift through reg, unchanged through reg, updated through reg, updated Shift through reg, updated Shift through reg, unchanged through reg, updated
Don't Care
Table Unipolar Code Table
CONTENTS 1111 1111 1111 ANALOG OUTPUT
Table Bipolar Code Table
CONTENTS 1111 1111 1111 ANALOG OUTPUT
4095 VREF 4096 2049 VREF 4096 2047 VREF 4096 VREF 4096
2047 VREF 2048 VREF 2048
VREF
1000 0000 0001
1000 0000 0001 1000 0000 0000
1000 0000 0000
0111 1111 1111
2048 2047 2048
VREF
0111 1111 1111
0000 0000 0001 0000 0000 0000
VREF
0000 0000 0001 0000 0000 0000
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface
Functional Diagram
MAX5722
INPUT REGISTER
12-BIT
OUTPUT BUFFER
OUTA
RESISTOR NETWORK
INPUT REGISTER
12-BIT
OUTPUT BUFFER
OUTB
INPUT CONTROL LOGIC SHIFT REGISTER
RESISTOR NETWORK POWER-DOWN CONTROL LOGIC
MAX5722
SCLK
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.
Chip Information
TRANSISTOR COUNT: 7737 PROCESS: BiCMOS
12-Bit, Low-Power, Dual, Voltage-Output with Serial Interface MAX5722
Package Information
8LUMAXD.EPS
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 2001 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
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