_______________General Description

The MAX522 contains two 8-bit, buffered, voltage-output

digital-to-analog converters (DAC A and DAC B) in small

8-pin SO and DIP packages. DAC A’s buffer can source

and sink 5mA, and DAC B’s output can source and sink

MAX522 operates with a single +2.7V to +5.5V supply.

The device utilizes a 3-wire serial interface, which oper-

ates at clock rates up to 5MHz and is compatible with

SPI™, QSPI™, and Microwire™ interface standards.

The serial input shift register is 16 bits long and con-

sists of eight bits of DAC input data and eight bits for

DAC selection and shutdown control. DAC registers

can be loaded independently or in parallel at the posi-

tive edge of CS.

The MAX522’s ultra-low power consumption and small

8-pin SO package make it ideal for portable and bat-

tery-powered applications. Supply current is less than

1mA and drops below 1µA in shutdown mode. In addi-

tion, the reference input is disconnected from the REF

pin during shutdown, further reducing the system’s total

power consumption. The software format is compatible

with the MAX512/MAX513 triple 8-bit DACs.

________________________Applications

Digital Gain and Offset Adjustment

Programmable Current Source

Programmable Voltage Source

Power-Amp Bias Control

VCO Tuning

____________________________Features

o Operates from a Single +2.7V to +5.5V Supply

o Dual Buffered Voltage Output

o Low Power Consumption:

1mA Operating Current

<1µA Shutdown Current

o Independently Programmable Shutdown Mode

o 5MHz, 3-Wire Serial Interface

o SPI™, QSPI™, and Microwire™ Compatible

o Space-Saving 8-Pin SO Package

Dual, 8-Bit, Voltage-Output

Serial DAC in 8-Pin SO Package

________________________________________________________________

Maxim Integrated Products

1

DAC

LATCH

A

DAC A

DAC

LATCH

B

DAC B

SCLK

OUTA

OUTB

DIN

REF

CS

MAX522

83

1

5

6

7

2

0.1

µF

0.1

µF

(OPTIONAL)

0.01

µF

GND

4

0.22

µF

________________Functional Diagram

OUTB

OUTA

GND

1

2

8

7

DIN

REF

SCLK

CS

MAX522

TOP VIEW

3

4

6

5

DIP/SO

__________________Pin Configuration

Call toll free 1-800-998-8800 for free samples or literature.

19-0403; Rev 0; 6/95

PART

TEMP. RANGE

PIN-PACKAGE

MAX522CPA

0°C to +70°C

8 Plastic DIP

MAX522CSA

0°C to +70°C

8 SO

MAX522EPA

-40°C to +85°C

8 Plastic DIP

SPI and QSPI are trademarks of Motorola Inc.

Microwire is a trademark of National Semiconductor Corp.

______________Ordering Information

MAX522ESA

-40°C to +85°C

8 SO