6

LTC1287

1287fa

On and Off Channel Leakage Current

3V

A

A

POLARITY

OFF CHANNEL

ON CHANNEL

LTC1287 TC1

I

DAGRA

BLOCK

TEST CIRCUITS

CLK

0.45V

0.6V

2.1V

LTC1287 TC03

0.6V

2.1V

LTC1287 TC04

3k

100pF

TEST POINT

LTC1287 TC05

INPUT

SHIFT

REGISTER

COMP

SAMPLE

AND

HOLD

12-BIT

CAPACITIVE

DAC

OUTPUT

SHIFT

REGISTER

12-BIT

SAR

CONTROL

AND

TIMING

8

ANALOG

INPUT MUX

2

3

5

GND

4

–IN

+IN

6

1

CLK

7

CS

LTC1287 BD

WAVEFORM 1

(SEE NOTE 1)

2.1V

90%

10%

WAVEFORM 2

(SEE NOTE 2)

CS

NOTE 1: WAVEFORM 1 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH

THAT THE OUTPUT IS HIGH UNLESS DISABLED BY THE OUTPUT CONTROL.

NOTE 2: WAVEFORM 2 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH

THAT THE OUTPUT IS LOW UNLESS DISABLED BY THE OUTPUT CONTROL.

LTC1287 TC06

1.5V

3k

100pF

TEST POINT

LTC1287 TC02