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1446L Datasheet(PDF) 10 Page - Linear Technology |
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1446L Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LTC1446/LTC1446L TYPICAL APPLICATIONS N An Autoranging 8-Channel ADC with Shutdown LTC1296 VCC 50k 74HC04 5V 5V CS 22 µF µP CLK 8 ANALOG INPUT CHANNELS DOUT DIN CH0 COM SSO REF – CH7 REF+ 50k 0.1 µF 100 Ω 100 Ω LTC1446 CS/LD CLK DOUT DIN VOUT B GND VCC 1446/46L F03 VOUT A 0.1 µF 0.1 µF 2N3906 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 VOUTB 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. |
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