General Description

The MAX5821 is a dual, 10-bit voltage-output, digital-to-

2-wire interface that operates at clock rates up to

400kHz. The device operates from a single 2.7V to 5.5V

decreases current consumption to less than 1µA. The

MAX5821 features three software-selectable power-

down output impedances: 100k

Ω, 1kΩ, and high

impedance. Other features include internal precision

circuit that powers up the DAC in the 100k

Ω power-

down mode.

ble serial interface that allows multiple devices to share

a single bus. All logic inputs are CMOS-logic compati-

ble and buffered with Schmitt triggers, allowing direct

interfacing to optocoupled and transformer-isolated

interfaces. The MAX5821 minimizes digital noise

feedthrough by disconnecting the clock (SCL) signal

from the rest of the device when an address mismatch

is detected.

The MAX5821 is specified over the extended tempera-

ture range of -40°C to +85°C and is available in a

miniature 8-pin µMAX package. Refer to the MAX5822

data sheet for the 12-bit version.

Applications

Digital Gain and Offset Adjustments

Programmable Voltage and Current Sources

Programmable Attenuation

VCO/Varactor Diode Control

Low-Cost Instrumentation

Battery-Operated Instrumentation

Features

o Ultra-Low Supply Current

o 300nA Low-Power Power-Down Mode

o Single 2.7V to 5.5V Supply Voltage

Serial Interface

o Schmitt-Trigger Inputs for Direct Interfacing

to Optocouplers

o Rail-to-Rail Output Buffer Amplifiers

o Three Software-Selectable Power-Down Output

Impedances

100k

Ω, 1kΩ, and High Impedance

o Read-Back Mode for Bus and Data Checking

o Power-On Reset to Zero

o 8-Pin µMAX Package

Dual, 10-Bit, Low-Power, 2-Wire, Serial

Voltage-Output DAC

________________________________________________________________ Maxim Integrated Products

1

REF

SDA

SCL

1

2

8

7

OUTB

OUTA

GND

ADD

µMAX

TOP VIEW

3

4

6

5

MAX5821

Pin Configuration

Ordering Information

µC

SDA

SCL

SDA

SDA

REF

REF

REF

SCL

SCL

OUTA

OUTB

OUTA

OUTB

MAX5821

MAX5821

Typical Operating Circuit

19-2316; Rev 0; 1/02

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.

PART

TEMP

RANGE

PIN-

PACKAGE

ADDRESS

MAX5821LEUA

-40

8 µMAX

0111 00X

MAX5821MEUA

-40

8 µMAX

1011 00X

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

230