1

LTC1448

Dual 12-Bit Rail-to-Rail

Micropower DAC

–

+

–

+

12-BIT

DAC B

RAIL-TO-RAIL

VOLTAGE

OUTPUTS

12-BIT

DAC A

POWER-ON

RESET

24-BIT

SHIFT

REG

AND

DAC

LATCH

µP

2

7

REF

4

6

1448 TA01

CLK

1

CS/LD

3

8

5

GND

2.7V TO 5.5V

Functional Block Diagram: 12-Bit Rail-to-Rail Dual DAC

Differential Nonlinearity

vs Input Code

CODE

0

–0.5

–0.4

–0.2

–0.1

0

0.5

0.2

1024

2048 2560

1448 TA02

–0.3

0.3

0.4

0.1

512

1536

3072 3584 4095

FEATURES

s

SO-8 Package

s

12-Bit Resolution

s

Buffered True Rail-to-Rail Voltage Output

s

s

s

3V and 5V Supply Operation

s

Schmitt Trigger on Clock Input Allows Direct

Optocoupler Interface

s

Power-On Reset Clears DACs to 0V

s

3-Wire Serial Interface

s

Maximum DNL Error: 0.5LSB

s

Low Cost

The LTC

digital-to-analog converter (DAC). It includes rail-to-rail

output buffer amplifiers and an easy-to-use 3-wire serial

interface. It is available in 8-pin SO and PDIP packages and

provides the smallest footprint of any dual 12-bit DAC.

The LTC1448 has an external reference input pin (REF)

and its outputs swing from 0V to REF. The REF input can

of 2.7V to 5.5V. (For devices with internal reference see the

LTC1446 data sheet.) The LTC1448 dissipates 2.5mW

from a 5V supply.

The low power supply current and the small SO-8 package

make the LTC1448 ideal for battery-powered applications.

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

s

Digital Calibration

s

Industrial Process Control

s

Automatic Test Equipment

s

Cellular Telephones