12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface MAX
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19-2122; 10/01
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface
MAX5742 quad, 12-bit, low-power, buffered voltage-output, digital-to-analog converter (DAC) packaged space-saving 10-pin µMAX package (5mm 3mm). wide supply voltage range +2.7V +5.5V 229µA supply current accommodates lowpower low-voltage applications. outputs employ on-chip precision output amplifiers that swing Rail-to-Rail®. MAX5742'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. MAX5742 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. MAX5742's software-controlled powerdown reduces supply current less than 0.3µA provides software-selectable output loads (1k, 100k, high impedance) while power-down. MAX5742 specified over -40°C +125°C automotive temperature range. Ultra-Low Power Consumption 229µA +3.6V 271µA +5.5V Wide +2.7V +5.5V Single-Supply Range 10-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
MAX5742
Applications
Automatic Tuning Gain Offset Adjustment Power Amplifier Control Process Control Boards Battery-Powered Instruments Control
PART MAX5742EUB MAX5742AUB
Ordering Information
TEMP RANGE -40°C +85°C -40°C +125°C PIN-PACKAGE µMAX µMAX
Configuration
VIEW
SCLK OUTD OUTC OUTB OUTA
Functional Diagram appears data sheet. Rail-to-Rail registered trademark Nippon Motorola, Inc. QSPI trademarks Motorola, Inc. MICROWIRE trademark National Semiconductor, Corp.
MAX5742
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, Quad, Voltage-Output with Serial Interface MAX5742
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) 10-Pin µMAX (derate mW/°C above +70°C) .555mW Operating Temperature Range .-40°C +125°C Junction Temperature.-65°C +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 Error 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, Quad, 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) V/µs nV-s nV-s nV-s +3V, +3V, Digital inputs ±0.1 SYMBOL CONDITIONS UNITS
MAX5742
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, Quad, Voltage-Output with Serial Interface MAX5742
_Typical Operating Characteristics
(VREF VDD, +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY CODE, +25°C
MAX5742 toc01
DIFFERENTIAL NONLINEARITY CODE, +25°C
MAX5742 toc02
TOTAL UNADJUSTED ERROR CODE, +25°C
-0.2 -0.4 -0.6 1024 1536 2048 2560 3072 3584 4096 CODE
MAX5742 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
MAX5742 toc04
DIFFERENTIAL NONLINEARITY CODE, -40°C
MAX5742 toc05
TOTAL UNADJUSTED ERROR CODE, -40°C
-0.2 -0.4 -0.6 1024 1536 2048 2560 3072 3584 4096 CODE
MAX5742 toc06
(LSB)
-0.2 -0.4 -0.6 -0.8
TOTAL UNADJUSTED ERROR
1024 1536 2048 2560 3072 3584 4096 CODE
-1.0 1024 1536 2048 2560 3072 3584 4096 CODE
INTEGRAL NONLINEARITY CODE, +125°C
MAX5742 toc07
DIFFERENTIAL NONLINEARITY CODE, +125°C
MAX5742 toc08
TOTAL UNADJUSTED ERROR CODE, +125°C
-0.2 -0.4 -0.6 1024 1536 2048 2560 3072 3584 4096 CODE
MAX5742 toc09
(LSB)
(LSB) -0.2 -0.4 -0.6 -0.8
TOTAL UNADJUSTED ERROR
1024 1536 2048 2560 3072 3584 4096 CODE
-1.0 1024 1536 2048 2560 3072 3584 4096 CODE
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface MAX5742
Typical Operating Characteristics (continued)
(VREF VDD, +25°C, unless otherwise noted.)
WORST-CASE TEMPERATURE
MAX5742 toc10
SOURCE-AND-SINK CURRENT CAPABILITY (VDD +3V)
MAX5742 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_
MAX5742 toc12 MAX5742 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
MAX5742 toc13
POWER-DOWN SUPPLY CURRENT SUPPLY VOLTAGE
POWER-DOWN SUPPLY CURRENT (nA)
MAX5742 toc14
SUPPLY CURRENT INPUT VOLTAGE
SUPPLY CURRENT (µA)
CODE SUPPLY CURRENT (µA) CODE SUPPLY VOLTAGE CODE
SUPPLY VOLTAGE INPUT VOLTAGE
SUPPLY CURRENT TEMPERATURE
SUPPLY CURRENT (µA) TEMPERATURE (°C) 3.6V 5.5V
MAX5742 toc16
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface MAX5742
Typical Operating Characteristics (continued)
(VREF VDD, +25°C, unless otherwise noted.)
FULL-SCALE SETTLING TIME (VDD +5V) FULL-SCALE SETTLING TIME (VDD +5V)
VSCLK, 5V/div
MAX5742 toc17
MAX5742 toc18
VSCLK, 5V/div
VOUT_ 1V/div CODE 200pF 1µs/div CODE 200pF 1µs/div
VOUT_ 1V/div
HALF-SCALE SETTLING TIME (VDD +3V)
HALF-SCALE SETTLING TIME (VDD +3V)
MAX5742 toc20
MAX5742 toc19
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)
MAX5742 toc21
DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +5V)
VSCLK, 5V/div
MAX5742 toc22
SCLK, fSCLK 500kHz 2V/div
CODE
VOUT_ 1V/div CODE
VOUT_ AC-COUPLED, 20mV/div
5µs/div
1µs/div
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface MAX5742
_Typical Operating Characteristics (continued)
(VREF VDD, +25°C, unless otherwise noted.)
DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +3V) DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +5V)
SCLK, fSCLK 500kHz, 2V/div
MAX5742 toc23
MAX5742 toc24
SCLK, fSCLK 500kHz 2V/div
CODE
VOUT_ AC-COUPLED, 20mV/div CODE 1µs/div
VOUT_ AC-COUPLED, 20mV/div
1µs/div
DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD +3V)
MAX5742 toc25
POWER-ON RESET, FAST RISE TIME (VDD +5V)
SCLK, fSCLK 500kHz, 2V/div
MAX5742 toc26
2V/div
VOUT_ AC-COUPLED, 20mV/div CODE 800F 1µs/div 20µs/div
RISE TIME 20µs
VOUT_ AC-COUPLED, 10mV/div
POWER-ON RESET, SLOW RISE TIME (VDD +5V)
POWER-ON RESET, FAST RISE TIME (VDD +3V)
2V/div
MAX5742 toc27
MAX5742 toc28
2V/div RISE TIME 20µs
RISE TIME 76µs
VOUT_ AC-COUPLED, 2mV/div
VOUT_ AC-COUPLED, 10mV/div
40µs/div
20µs/div
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface MAX5742
Typical Operating Characteristics (continued)
(VREF VDD, +25°C, unless otherwise noted.)
POWER-ON RESET, SLOW RISE-TIME (VDD +3V)
MAX5742 toc29
CLOCK FEEDTHROUGH (VDD +5V)
MAX5742 toc30
2V/div RISE TIME 72µs
SCLK, 2V/div
VOUT_ AC-COUPLED, 2mV/div
CODE HEX, 2µs/div fSCLK 50kHz 2µs/div
VOUT_ AC-COUPLED, 1mV/div
40µs/div
CLOCK FEEDTHROUGH (VDD +3V)
MAX5742 toc31
LINE TRANSIENT RESPONSE (VDD +5V)
SCLK, 2V/div
MAX5742 toc32
VDD, AC-COUPLED, 100mV/div
CODE HEX, 2µs/div fSCLK 50kHz 2µs/div
VOUT_ AC-COUPLED, 1mV/div
VOUT_ AC-COUPLED, 10mV/div
20µs/div
LINE TRANSIENT RESPONSE (VDD +3V)
MAX5742 toc33
CROSSTALK (VDD +5V)
MAX5742 toc34
VDD, AC-COUPLED, 100mV/div
CODE
VOUTA, 2V/div
VOUT_ AC-COUPLED, 10mV/div
VOUTB, AC-COUPLED, 2mV/div
20µs/div
4µs/div
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface
Description
7-10 NAME SCLK OUTA -OUTD Chip-Select Input Serial-Clock Input Power-Supply Input Ground Serial Data Input External Reference Voltage Input Voltage Outputs. Power-on reset sets registers zero, internally connects with 100k resistor. FUNCTION
MAX5742
Detailed Description
MAX5742 contains four 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. MAX5742 shares reference input (REF) between four DACs. MAX5742 includes rail-torail output buffer amplifiers each DAC, input logic simple microprocessor (µP), CMOS interfaces. power-supply range from +2.7V +5.5V (Functional Diagram). MAX5742's reference input accepts voltage range from VDD. power-down mode reference input high impedance. MAX5742 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 four DACs. reference input voltage range VDD. impedance 45k. 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
MAX5742 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, Quad, Voltage-Output with Serial Interface MAX5742
Table Power-Down Mode Control
EXTENDED CONTROL D11-D5 DATA BITS O/P, wakeup Floating output Output terminated with Output terminated with 100k O/P, wakeup Floating output Output terminated with Output terminated with 100k O/P, wakeup Floating output Output terminated with Output terminated with 100k O/P, wakeup Floating output Output terminated with Output terminated with 100k O/P, wakeup 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.
C3-C0 control bits. data bits straight binary format. zeros correspond zero scale ones correspond full scale.
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.
Power-On Reset (POR)
MAX5742 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.
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface MAX5742
CONTENTS SHIFT REGISTER (MSB) (LSB)
Figure 16-Bit Input Word
SCLK
tCSPWH
tCSS
tCSH
Figure Timing Diagram
Applications Information
Unipolar Output
typical application circuit (Figure shows MAX5742 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
MAX5742 configured bipolar operation using dual supply (Figure transfer function bipolar operation VOUT VREF 4096
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface MAX5742
Table Serial-Interface Programming Commands
CONTROL DATA BITS D11-D00 FUNCTION Shift through reg, updated Shift through reg, updated Shift through reg, updated Shift through reg, updated Shift through reg, unchanged Shift through reg, unchanged Shift through reg, unchanged Shift through reg, unchanged through reg, updated through reg, updated through reg, updated through reg, updated Shift through reg, updated Shift through reg, unchanged through reg, updated
Don't care
+2.7V +5.5V
+2.7V +5.5V
DAC_
OUT_ DAC_
VOUT
MAX6050
OUT_
MAX5742
MAX5742
Figure Typical Operating Circuit, Unipolar Output
Figure Bipolar Output Circuit
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface MAX5742
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 VREF 2047 VREF 4096 VREF 4096
2047 VREF 2048 VREF 2048
VREF
1000 0000 0001
1000 0000 0001 1000 0000 0000 0111 1111 1111
1000 0000 0000
2048 2047 2048
0111 1111 1111
0000 0000 0001 0000 0000 0000
VREF
0000 0000 0001 0000 0000 0000
VREF
Chip Information
TRANSISTOR COUNT: 14,458 PROCESS: BiCMOS
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface MAX5742
Functional Diagram
INPUT REGISTER
12-BIT
OUTPUT BUFFER
OUTA
RESISTOR NETWORK
INPUT REGISTER
12-BIT
OUTPUT BUFFER
OUTB
RESISTOR NETWORK
INPUT REGISTER
12-BIT
OUTPUT BUFFER
OUTC
RESISTOR NETWORK
INPUT REGISTER
12-BIT
OUTPUT BUFFER
OUTD
INPUT CONTROL LOGIC SHIFT REGISTER
RESISTOR NETWORK POWER-DOWN CONTROL LOGIC
MAX5742
SCLK
12-Bit, Low-Power, Quad, Voltage-Output with Serial Interface
Package Information
10LUMAX.EPS
MAX5742
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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