1

LTC1446/LTC1446L

APPLICATIO S

DESCRIPTIO

FEATURES

Dual 12-Bit Rail-to-Rail

Micropower DACs in SO-8

s

Dual DACs with 12-Bit Resolution

s

SO-8 Package

s

Rail-to-Rail Output Amplifiers

s

Internal Reference

s

Maximum DNL Error: 0.5LSB

s

s

s

Settling Time: 14

µs to ±0.5LSB

s

Power-On Reset Clears DACs to 0V

s

3-Wire Cascadable Serial Interface with 500kHz

Update Rate

s

Schmitt Trigger On Input Allows Direct

Optocoupler Interface

s

Low Cost

The LTC

converters (DACs) available in an SO-8 package. They are

complete with a rail-to-rail voltage output amplifier, an

internal reference and an easy-to-use 3-wire cascadable

serial interface.

The LTC1446 has an internal reference and a full-scale

output of 4.095V. It operates from a single 4.5V to 5.5V

supply.

The LTC1446L has an internal reference and a full-scale

output of 2.5V. It operates from a single 2.7V to 5.5V

supply.

The low power supply current makes the LTC1446 family

ideal for battery-powered applications. These DACs are

available in space saving 8-pin SO and PDIP packages and

require no external components for operation.

Differential Nonlinearity vs Input Code

CODE

0

–0.5

–0.4

–0.2

–0.1

0

0.5

0.2

1024

2048 2560

1446/46L G13

–0.3

0.3

0.4

0.1

512

1536

3072 3584 4095

–

+

–

+

12-BIT

DAC B

LTC1446: 5V

LTC1446L: 3V TO 5V

RAIL-TO-RAIL

VOLTAGE

OUTPUT

12-BIT

DAC A

POWER-ON

RESET

24-BIT

SHIFT

REG

AND

DAC

LATCH

µP

2

7

4

6

1446/1446L TA01

CLK

1

CS/LD

3

8

5

GND

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

s

Digital Calibration

s

Industrial Process Control

s

Automatic Test Equipment

s

Cellular Telephones

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