General Description

The MAX5721 dual 10-bit, low-power, buffered voltage-

output, digital-to-analog converter (DAC) is packaged

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

MAX5721’s reference input accepts a voltage range

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 100k

Ω resistor 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 (1k

Ω, 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

o Ultra-Low Power Consumption

o Wide +2.7V to +5.5V Single-Supply Range

o Tiny 8-Pin µMAX Package

o 0.3µA Power-Down Current

o Guaranteed 10-Bit Monotonicity (±1LSB DNL)

o Safe Power-Up Reset to Zero Volts at DAC Output

o Three Software Selectable Power-Down

Impedances (100k

Ω, 1kΩ, Hi-Z)

o Fast 20MHz, 3-Wire SPI, QSPI, and MICROWIRE-

Compatible Serial Interface

o Rail-to-Rail Output Buffer Amplifiers

o Schmitt-Triggered Logic Inputs for Direct

Interface to Optocouplers

o Wide -40°C to +125°C Operating Temperature

Range

10-Bit, Low-Power, Dual, Voltage-Output

DAC with Serial Interface

________________________________________________________________ Maxim Integrated Products

1

REF

DIN

SCLK

1

2

8

7

OUTB

OUTA

GND

CS

µMAX

TOP VIEW

3

4

6

5

MAX5721

Pin Configuration

19-2125; Rev 2; 7/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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

PART

TEMP RANGE

PIN-PACKAGE

MAX5721EUA

-40°C to +85°C

8 µMAX

MAX5721AUA

-40°C to +125°C

8 µMAX

Functional Diagram appears at end of data sheet.