_______________General Description

The MAX548A/MAX549A/MAX550A serial, 8-bit voltage-

output digital-to-analog converters (DACs) operate from

a single +2.5V to +5.5V supply. Their ±1LSB TUE spec-

ification is guaranteed over temperature. Operating cur-

rent (supply current plus reference current) is typically

is disconnected from the reference, reducing current

drain to less than 1µA. The MAX548A/MAX549A allow

each DAC to be shut down independently.

The 10MHz, 3-wire serial interface is compatible with

SPI™/QSPI™ and Microwire™ interface standards.

Double-buffered inputs provide flexibility when updat-

ing the DACs; the input and DAC registers can be

updated individually or simultaneously.

The MAX548A is a dual DAC with an asynchronous

MAX549A is a dual DAC with an external reference

input. The MAX550A is a single DAC with an external

reference input and an asynchronous load input.

The MAX548A/MAX549A/MAX550A’s low power con-

sumption and small µMAX and DIP packages make

these devices ideal for portable and battery-powered

applications.

________________________Applications

Battery-Powered Systems

VCXO Control

Comparator-Level Settings

GaAs Amp Bias Control

Digital Gain and Offset Control

____________________________Features

o +2.5V to +5.5V Single-Supply Operation

o ±1LSB (max) TUE

o Power-On Reset Clears All Registers to Zero

o Low Operating Current:

o 1µA Shutdown Mode

o 10MHz, 3-Wire Serial Interface Compatible with

SPI/QSPI and Microwire

o µMAX Package—50% Smaller than 8-Pin SO

o Independent Shutdown of DACs

(MAX548A/MAX549A)

+2.5V to +5.5V, Low-Power, Single/Dual,

8-Bit Voltage-Output DACs in µMAX Package

________________________________________________________________

Maxim Integrated Products

1

LDAC

SCLK

DIN

1

2

8

7

OUTB

OUTA

CS

GND

DIP/

µMAX

TOP VIEW

3

4

6

5

MAX548A

_________________Pin Configurations

_____________________Selector Guide

19-1206; Rev 0; 3/97

PART

MAX548ACPA

MAX548ACUA

MAX548AC/D

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE†

8 Plastic DIP

8 µMAX

Dice*

______________Ordering Information

Ordering Information continued at end of data sheet.

*

†Contact factory for availability of 8-pin SO package.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

MAX548A

MAX549A

Number of DACs

2

2

DAC Reference

External

FEATURE

External

Asynchronous

Load DAC Input

√

MAX550A

1

—

µMAX Package

√

√

√

√

SPI and QSPI are trademarks of Motorola Inc.

Microwire is a trademark of National Semiconductor Corp.

MAX548AEPA

MAX548AEUA

-40°C to +85°C

-40°C to +85°C

8 Plastic DIP

8 µMAX

Pin Configurations continued at end of data sheet.