LTC1598IG datasheet(7/24 Pages) LINER

Part #	LTC1598IG

Description	4- and 8-Channel, Micropower Sampling 12-Bit Serial I/O A/D Converters

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Manufacturer	LINER [Linear Technology]

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LTC1594/LTC1598

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PIN FUNCTIONS

LTC1594

CH0 (Pin 1): Analog Multiplexer Input.

CH1 (Pin 2): Analog Multiplexer Input.

CH2 (Pin 3): Analog Multiplexer Input.

CH3 (Pin 4): Analog Multiplexer Input.

ADCIN (Pin 5): ADC Input. This input is the positive analog

input to the ADC. Connect this pin to MUXOUT for normal

operation.

VREF (Pin 6): Reference Input. The reference input defines

the span of the ADC.

COM (Pin 7): Negative Analog Input. This input is the

negative analog input to the ADC and must be free of noise

with respect to GND.

GND (Pin 8): Analog Ground. GND should be tied directly

to an analog ground plane.

CSADC (Pin 9): ADC Chip Select Input. A logic high on this

input powers down the ADC and three-states DOUT. A logic

low on this input enables the ADC to sample the selected

channel and start the conversion. For normal operation

drive this pin in parallel with CSMUX.

LTC1598

CH5 (Pin 1): Analog Multiplexer Input.

CH6 (Pin 2): Analog Multiplexer Input.

CH7 (Pin 3): Analog Multiplexer Input.

GND (Pin 4): Analog Ground. GND should be tied directly

to an analog ground plane.

CLK (Pin 5): Shift Clock. This clock synchronizes the serial

data transfer to both MUX and ADC. It also determines the

conversion speed of the ADC.

CSMUX (Pin 6): MUX Chip Select Input. A logic high on

this input allows the MUX to receive a channel address. A

logic low enables the selected MUX channel and connects

it to the MUXOUT pin for A/D conversion. For normal

operation, drive this pin in parallel with CSADC.

DIN (Pin 7): Digital Data Input. The multiplexer address is

shifted into this input.

DOUT (Pin 10): Digital Data Output. The A/D conversion

result is shifted out of this output.

VCC (Pin 11): Power Supply Voltage. This pin provides

power to the ADC. It must be bypassed directly to the

analog ground plane.

CLK (Pin 12): Shift Clock. This clock synchronizes the

serial data transfer to both MUX and ADC.

CSMUX (Pin 13): MUX Chip Select Input. A logic high on

this input allows the MUX to receive a channel address. A

logic low enables the selected MUX channel and connects

it to the MUXOUT pin for A/D conversion. For normal

operation, drive this pin in parallel with CSADC.

DIN (Pin 14): Digital Data Input. The multiplexer address

is shifted into this input.

MUXOUT (Pin 15): MUX Output. This pin is the output of

the multiplexer. Tie to ADCIN for normal operation.

VCC (Pin 16): Power Supply Voltage. This pin should be

tied to Pin 11.

COM (Pin 8): Negative Analog Input. This input is the

negative analog input to the ADC and must be free of noise

with respect to GND.

GND (Pin 9): Analog Ground. GND should be tied directly

to an analog ground plane.

CSADC (Pin 10): ADC Chip Select Input. A logic high on

this input deselects and powers down the ADC and three-

states DOUT. A logic low on this input enables the ADC to

sample the selected channel and start the conversion. For

normal operation drive this pin in parallel with CSMUX.

DOUT (Pin 11): Digital Data Output. The A/D conversion

result is shifted out of this output.

NC (Pin 12): No Connection.

NC (Pin 13): No Connection.

CLK (Pin 14): Shift Clock. This input should be tied to Pin 5.

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