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MAX5721AUAMAXIMN/a1avai10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface
MAX5721EUAMAXIMN/a17avai10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface


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MAX5721AUA-MAX5721EUA
10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface
General Description
The MAX5721 dual 10-bit, low-power, buffered voltage-
output, digital-to-analog converter (DAC) is packaged
in a space-saving 8-pin µMAX package (5mm ✕3mm).
The wide supply voltage range of +2.7V to +5.5V and
112µA supply current accommodate low-power and
low-voltage applications. DAC outputs employ on-chip
precision output amplifiers that swing Rail-to-Rail®. The
MAX5721’s reference input accepts a voltage range
from 0 to VDD. In power-down the reference input is
high impedance, further reducing the system’s total
power consumption.
The 20MHz, 3-wire SPI™, QSPI™, MICROWIRE™ and
DSP-compatible serial interface saves board space
and reduces the complexity of opto- and transformer-
isolated applications. The MAX5721 on-chip power-on
reset (POR) circuit resets the DAC outputs to zero and
loads the output with a 100kΩresistor to ground. This
provides additional safety for applications that drive
valves or other transducers that need to be off on
power-up. The MAX5721’s software-controlled power-
down reduces supply current to less than 0.3µA and
provides software-selectable output loads (1kΩ, 100kΩ,
or high impedance) while in power-down. The
MAX5721 is specified over the -40°C to +125°C auto-
motive temperature range
Applications

Automatic Tuning
Gain and Offset Adjustment
Power Amplifier Control
Process Control I/O Boards
Battery-Powered Instruments
VCO Control
Features
Ultra-Low Power Consumption
112µA at VDD= +3.6V
135µA at VDD= +5.5V
Wide +2.7V to +5.5V Single-Supply RangeTiny 8-Pin µMAX Package 0.3µA Power-Down Current Guaranteed 10-Bit Monotonicity (±1LSB DNL)Safe Power-Up Reset to Zero Volts at DAC OutputThree Software Selectable Power-Down
Impedances (100kΩ, 1kΩ, Hi-Z)
Fast 20MHz, 3-Wire SPI, QSPI, and MICROWIRE-
Compatible Serial Interface
Rail-to-Rail Output Buffer AmplifiersSchmitt-Triggered Logic Inputs for Direct
Interface to Optocouplers
Wide -40°C to +125°C Operating Temperature
Range
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
Pin Configuration

19-2125; Rev 2; 7/03
Rail-to-Rail is a registered trademark of Nippon Motorola, Inc.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Corp.
Ordering Information
Functional Diagram appears at end of data sheet.
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.5V, GND = 0, VREF= VDD, RL= 5kΩ, CL= 200pF, TA= TMINto TMAX, unless otherwise noted. Typical values are
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDDto GND..............................................................-0.3V to +6V
OUT_, SCLK, DIN, CS, REF to GND...............-0.3 to (VDD+0.3V)
Maximum Continuous Current Into Any Pin......................±50mA
Continuous Power Dissipation (TA= +70°C)
8-Pin µMAX (derate 4.6 mW/°C above +70°C)............362mW
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature.....................................................+150°C
Storage Temperature Range............................-65°C to +150°C
Lead Temperature (soldering, 10s)................................+300°C
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.5V, GND = 0, VREF= VDD, RL= 5kΩ, CL= 200pF, TA= TMINto TMAX, unless otherwise noted. Typical values are
TIMING CHARACTERISTICS
Note 1:
DC specifications are tested without output loads.
Note 2:
Linearity guaranteed from code 29 to code 995.
Note 3:
Limited with test conditions.
Note 4:
Offset and gain error limit the FSR.
Note 5:
Guaranteed by design.
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
1024
MAX5721 toc01
CODE
INL (LSB)
INTEGRAL NONLINEARITY
vs. CODE, TA = +25°C

MAX5721 toc02
CODE
DNL (LSB)
DIFFERENTIAL NONLINEARITY
vs. CODE, TA = +25°C

MAX5721 toc03
CODE
TOTAL UNADJUSTED ERROR (%)5122567681024
TOTAL UNADJUSTED ERROR
vs. CODE, TA = +25°C
1024
MAX5721 toc04
CODE
INL (LSB)
INTEGRAL NONLINEARITY
vs. CODE, TA = +40°C

MAX5721 toc07
CODE
INL (LSB)
INTEGRAL NONLINEARITY
vs. CODE, TA = +125°C

MAX5721 toc05
CODE
DNL (LSB)
DIFFERENTIAL NONLINEARITY
vs. CODE, TA = -40°C

MAX5721 toc06
CODE
TOTAL UNADJUSTED ERROR (%)
TOTAL UNADJUSTED ERROR
vs. CODE, TA = -40°C
MAX5721 toc08
CODE
DNL (LSB)
DIFFERENTIAL NONLINEARITY
vs. CODE, TA = +125°C

MAX5721 toc09
CODE
TOTAL UNADJUSTED ERROR (%)
TOTAL UNADJUSTED ERROR
vs. CODE, TA = +125°C
__________________________________________Typical Operating Characteristics
(VREF= VDD, TA= +25°C, unless otherwise noted.)
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface

MAX5721 toc10
TEMPERATURE (°C)
INL AND DNL (LSB)
WORST-CASE INL AND DNL
vs. TEMPERATURE

SOURCE-AND-SINK CURRENT CAPABILITY
(VDD = +3V)
MAX5721 toc11
ISOURCE/SINK (mA)
OUT
(V)26810121416
SOURCE-AND-SINK CURRENT CAPABILITY
(VDD = +5V)

MAX5721 toc12
ISOURCE/SINK (mA)
OUT
(V)
MAX5721 toc13
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
FULL-SCALE SETTLING TIME (VDD = +5V)

MAX5721 toc17
VOUT_
1V/div
1µs/div
VSCLK
5V/div
MAX5721 toc14
SUPPLY VOLTAGE (V)
POWER-DOWN SUPPLY CURRENT (nA)
POWER-DOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE

SUPPLY CURRENT vs. CS INPUT VOLTAGE
MAX5721 toc15
SUPPLY CURRENT (
CS INPUT VOLTAGE (V)
Typical Operating Characteristics (continued)

(VREF= VDD, TA= +25°C, unless otherwise noted.)
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
HALF-SCALE SETTLING TIME (VDD = +3V)

MAX5721 toc19
VOUT_
1V/div
1µs/div
VSCLK
5V/div
HALF-SCALE SETTLING TIME (VDD = +3V)

MAX5721 toc20
VOUT_
1V/div
1µs/div
VSCLK
5V/div
Typical Operating Characteristics (continued)

(VREF= VDD, TA= +25°C, unless otherwise noted.)
MAX5721
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
DIGITAL-TO-ANALOG GLITCH IMPULSE
(VDD = +3V)

MAX5721 toc25
VOUT_
AC-COUPLED,
20mV/div
1µs/div
SCLK,
fSCLK = 500kHz,
1V/div
POWER-ON RESET, FAST RISE TIME
(VDD = +5V)

MAX5721 toc26
VOUT_
AC-COUPLED,
10mV/div
20µs/div
VDD
2V/div
Typical Operating Characteristics (continued)

( VREF= VDD, TA= +25°C, unless otherwise noted.)
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