LTC1288CS8 datasheet(7/24 Pages) LINER

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LTC1285/LTC1288

LTC1285

VREF (Pin 1): Reference Input. The reference input defines

the span of the A/D converter.

IN+ (Pin 2): Positive Analog Input.

IN – (Pin 3): Negative Analog Input.

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

to an analog ground plane.

CS/SHDN (Pin 5): Chip Select Input. A logic low on this

input enables the LTC1285. A logic high on this input

disables and powers down the LTC1285.

DOUT (Pin 6): Digital Data Output. The A/D conversion

result is shifted out of this output.

CLK (Pin 7): Shift Clock. This clock synchronizes the serial

data transfer and determines conversion speed.

VCC (Pin 8): Power Supply Voltage. This pin provides

power to the A/D converter. It must be kept free of noise

and ripple by bypassing directly to the analog ground

plane.

TYPICAL PERFORMANCE CHARACTERISTICS

Minimum Clock Frequency

for 0.1 LSB Error vs Temperature

TEMPERATURE (°C)

100

120

LTC1285/88 • TPC22

VCC = 2.7V

VREF = 2.5V

TEMPERATURE (°C)

–55

100

1000

105

LTC1285/88 • TPC24

0.1

0.01

–15

–35

125

VCC = 2.7V

VREF = 2.5V

ON CHANNEL

OFF CHANNEL

Input Channel Leakage Current

vs Temperature

Digital Input Logic Threshold

vs Supply Voltage

SUPPLY VOLTAGE (V)

2.5

2.0

2.5

3.0

4.0

5.0

LTC1285/88 • TPC23

1.5

1.0

3.0

3.5

4.5

5.5

6.0

0.5

TA = 25°C

PIN FUNCTIONS

LTC1288

CS/SHDN (Pin 1): Chip Select Input. A logic low on this

input enables the LTC1288. A logic high on this input

disables and powers down the LTC1288.

CH0 (Pin 2): Analog Input.

CH1 (Pin 3): Analog Input.

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

to an analog ground plane.

DIN (Pin 5): Digital Data Input. The multiplexer address is

shifted into this input.

DOUT (Pin 6): Digital Data Output. The A/D conversion

result is shifted out of this output.

CLK (Pin 7): Shift Clock. This clock synchronizes the

serial data transfer and determines conversion speed.

VCC/VREF (Pin 8): Power Supply and Reference Voltage.

This pin provides power and defines the span of the A/D

converter. It must be kept free of noise and ripple by

bypassing directly to the analog ground plane.

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