LTC1448IS8 데이터 시트보기 (PDF) - Linear Technology

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LTC1448IS8

Dual 12-Bit Rail-to-Rail Micropower DAC

Linear Technology 

LTC1448

TYPICAL APPLICATIONS

This circuit shows how to use one LTC1448 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 LTC1448. 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 LTC1448.

The resistor and capacitor on the LTC1448 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

LTC1448

CS/LD

GND

REF

VOUT A

100Ω

100Ω

5V

0.1µF

0.1µF

0.1µF

1448 TA04

8

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