LTC1598LCG-PBF Просмотр технического описания (PDF) - Linear Technology

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LTC1598LCG-PBF

4- and 8-Channel, 3V Micropower Sampling 12-Bit Serial I/O A/D Converters

Linear Technology 

LTC1594L/LTC1598L

PIN FUNCTIONS

LTC1594L

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.

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.

LTC1598L

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.

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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