General Description

The MAX5548 dual, 8-bit, digital-to-analog converter

(DAC) features high-output-current capability. The

MAX5548 sources up to 30mA per DAC, making it ideal

for PIN diode biasing applications. Outputs can also be

paralleled for high-current applications (up to 60mA

typ). Operating from a single +2.7V to +5.25V supply,

the MAX5548 typically consumes 1.5mA per DAC in

normal operation and less than 1µA (max) in shutdown

mode. The MAX5548 also features low output leakage

current in shutdown mode (±1µA max) that is essential

to ensure that the external PIN diodes are off.

Additional features include an integrated +1.25V

bandgap reference, and a control amplifier to ensure

high accuracy and low-noise performance. A separate

reference input (REFIN) allows for the use of an external

reference source, such as the MAX6126, for improved

serial interface provides optimum flexibility for the

MAX5548. The maximum programmable output current

value is set using software and an adjustment resistor.

The MAX5548 is available in a 3mm x 3mm, 16-pin, thin

QFN package, and is specified over the extended

(-40°C to +85°C) temperature range.

Applications

PIN Diode Biasing

RF Attenuator Control

VCO Tuning

Features

♦ Guaranteed Low Output Leakage Current in

Shutdown (±1µA max)

♦ Guaranteed Monotonic over Extended

Temperature Range

♦ Dual Outputs for Balanced Systems

♦ Current Outputs Source Up to 30mA per DAC

♦ Parallelable Outputs for 60mA Applications

♦ Output Stable with RF Filters

♦ Internal or External Reference Capability

♦ Digital Output (DOUT) Available for Daisy

Chaining in SPI Mode

♦ +2.7V to +5.25V Single-Supply Operation

♦ 16-Pin (3mm x 3mm) Thin QFN Package

♦ Programmable Output Current Range Set by

Software and Adjustment Resistor

Dual, 8-Bit, Programmable, 30mA

High-Output-Current DAC

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-3836; Rev 0; 10/05

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-

PKG

PKG

CODE

TOP

MARK

MAX5548ETE

-40°C to

+85°C

16 Thin

QFN

T1633F-3

ACY

Inc., or one of its sublicensed Associated Companies, conveys

SPI is a trademark of Motorola, Inc.

+1.25V

REF

REFIN

BUFFER

8-BIT CURRENT-STEERING

DAC A

OUTA

FSADJA

OUTB

FSADJB

GND

DOUT/A1

CS/A0

DIN/SDA

SCLK/SCL

SPI/

I2C

16-BIT INPUT REGISTER

DAC REGISTER A

DAC REGISTER B

8-BIT CURRENT-STEERING

DAC B

MAX5548

P

P

Functional Diagram

Pin Configuration appears at end of data sheet.