LTC1290B(Rev_C) 查看數據表（PDF） - Linear Technology

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LTC1290B
(Rev.:Rev_C)

Single Chip 12-Bit Data Acquisition System

Linear Technology 

LTC1290

PI FU CTIO S

DIN (Pin 17): Digital Data Input. The A/D configuration

word is shifted into this input after CS is recognized.

SCLK (Pin 18): Shift Clock. This clock synchronizes the

serial data transfer.

ACLK (Pin 19): A/D Conversion Clock. This clock controls

the A/D conversion process.

VCC (Pin 20): Positive Supply. This supply must be kept

free of noise and ripple by bypassing directly to the analog

ground plane.

BLOCK DIAGRAM

VCC 20

17

DIN

INPUT

SHIFT

REGISTER

1

CH0

2

CH1

CH2 3

CH3 4

5

CH4

CH5 6

CH6 7

8

CH7

9

COM

ANALOG

INPUT MUX

SAMPLE-

AND-

HOLD

COMP

12-BIT

CAPACITIVE

DAC

10

DGND

11

AGND

12

13

V–

REF–

14

REF+

18

SCLK

OUTPUT

SHIFT

REGISTER

16

DOUT

12-BIT

SAR

CONTROL

AND

TIMING

19

ACLK

15

CS

LTC1290 • BD

TEST CIRCUITS

On and Off Channel Leakage Current

5V

ION

A

IOFF

A

POLARITY

ON CHANNEL

•

•

•

OFF

CHANNELS

•

LTC1290 • TC01

Load Circuit for tdis and ten

TEST POINT

DOUT

3k

100pF

5V WAVEFORM 2

WAVEFORM 1

LTC1290 • TC02

7

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