1

LTC1257

Complete Single Supply

12-Bit Voltage Output

DAC in SO-8

APPLICATI

TYPICAL

CODE

0

0.5

0.0

–0.5

1024

2048 2560

1257 TA05

512

1536

3072 3584 4098

Differential Nonlinearity

vs Input Code

S

APPLICATI

s

Digital Offset/Gain Adjustment

s

Industrial Process Control

s

Automatic Test Equipment

S

FEATURE

The LTC

output D/A converter (DAC) in an SO-8 package. The

LTC1257 includes an output buffer amplifier, 2.048V

voltage reference and an easy to use three-wire cascadable

serial interface. An external reference can be used to

override the internal reference and extend the output

voltage range to 12V. The power supply current is a low

350

µA when operating from a 5V supply, making the

LTC1257 ideal for battery-powered applications. The space-

saving 8-pin SO package and operation with no external

components provide the smallest 12-bit D/A system

available.

DESCRIPTIO

s

8-Pin SO Package

s

Buffered Voltage Output

s

Built-In 2.048V Reference

s

500

µV/LSB with 2.048V Full Scale

s

1/2LSB Max DNL Error

s

Guaranteed 12-Bit Monotonic

s

3-Wire Cascadable Serial Interface

s

s

, LTC and LT are registered trademarks of Linear Technology Corporation.

µP

5V

0.1

µF

0.1

µF

CONTROL OUTPUT 1

CONTROL OUTPUT 2

GND

CLK

LOAD

LTC1257

GND

CLK

LOAD

LTC1257

TO NEXT DAC

1257 TA01

Daisy-Chained Control Outputs