LTC1446 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC1446

Dual 12-Bit Rail-to-Rail Micropower DACs in SO-8

Linear Technology 

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LTC1446/LTC1446L

TYPICAL APPLICATIONS N

This circuit shows how to use an LTC1446 and an

LT®1077 to make a wide bipolar output swing 12-bit DAC

with an offset that can be digitally programmed. VOUT A,

which can be set by loading the appropriate digital code

for DAC A, sets the offset. As this value changes, the

transfer curve for the output moves up and down as

illustrated in the graph below.

A Wide Swing, Bipolar Output DAC with Digitally Controlled Offset

5V

0.1µF

CLK

VOUT B

DIN

VCC

µP

LTC1446

CS/LD

GND

50k

100k

15V

+

LT1077

–

DOUT

VOUT A

50k

–15V

100k

VOUT =

2 (VOUT B – VOUT A)

8.190

VOUT

4.094

0

–4.096

–8.190

A

B

DIN

C

A: VOUT A ≅ 0V

B: VOUT A ≅ 2.048V

C: VOUT A ≅ 4.095V

1446/46L F02

9

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