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 one LTC1446 to make an

autoranging ADC. The microprocessor sets the reference

span and the Common pin for the analog input by loading

the appropriate digital code into the LTC1446. VOUT A

controls the Common pin for the analog inputs to the

LTC1296 and VOUT B controls the reference span by setting

the REF + pin on the LTC1296. The LTC1296 has a Shut-

down pin that goes low in shutdown mode. This will turn

off the PNP transistor supplying power to the LTC1446.

The resistor and capacitor on the LTC1446 outputs act as

a lowpass filter for noise.

An Autoranging 8-Channel ADC with Shutdown

22µF

5V

VCC

CS

CH0

DOUT

8 ANALOG

µP

CLK LTC1296

INPUT CHANNELS

DIN

CH7

COM

REF+

SSO REF –

74HC04

50k

50k

CLK

VOUT B

DIN

VCC

LTC1446

CS/LD

GND

DOUT

VOUT A

100Ω

100Ω

5V

0.1µF

0.1µF

0.1µF

1446/46L F03

10

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