7

LTC1293/LTC1294/LTC1296

129346fs

PI FU CTIO S

#

PIN

FUNCTION

DESCRIPTION

1 – 6

CH0 – CH5

Analog Inputs

The analog inputs must be free of noise with respect to AGND.

7

COM

Common

The common pin defines the zero reference point for all single ended inputs. It must be free of noise and is

usually tied to the analog ground plane.

8

DGND

Digital Ground

This is the ground for the internal logic. Tie to the ground plane.

9V

–

Negative Supply

Tie V

10

AGND

Analog Ground

AGND should be tied directly to the analog ground plane.

11

Ref. Input

The reference inputs must be kept free of noise with respect to AGND.

12

Data Input

The A/D configuration word is shifted into this input.

13

Digital Data Output The A/D conversion result is shifted out of this output.

14

CS

Chip Select Input

A logic low on this input enables data transfer.

15

CLK

Clock

This clock synchronizes the serial data transfer and controls A/D conversion rate.

16

Positive supply

This supply must be kept free of noise and ripple by bypassing directly to the analog ground plane.

LTC1293

#

PIN

FUNCTION

DESCRIPTION

1 –8

CH0 – CH7

Analog Inputs

The analog inputs must be free of noise with respect to AGND.

9

COM

Common

The common pin defines the zero reference point for all single ended inputs. It must be free of noise and is

usually tied to the analog ground plane.

10

DGND

Digital Ground

This is the ground for the internal logic. Tie to the ground plane.

11

V

–

Negative Supply

Tie V

12

AGND

Analog Ground

AGND should be tied directly to the analog ground plane.

13, 14 REF

The reference inputs must be kept free of noise with respect to AGND. The A/D sees a reference voltage equal

to the difference between REF

15

Data Input

The A/D configuration word is shifted into this input.

16

Digital Data Output The A/D conversion result is shifted out of this output.

17

CS

Chip Select Input

A logic low on this input enables data transfer.

18

CLK

Clock

This clock synchronizes the serial data transfer and controls A/D converion rate.

Positive Supplies

LTC1294

#

PIN

FUNCTION

DESCRIPTION

1 –8

CH0 – CH7

Analog Inputs

The analog inputs must be free of noise with respect to AGND.

9

COM

Common

The common pin defines the zero reference point for all single ended inputs. It must be free of noise and is

usually tied to the analog ground plane.

10

DGND

Digital Ground

This is the ground for the internal logic. Tie to the ground plane.

11

V

–

Negative Supply

Tie V

12

AGND

Analog Ground

AGND should be tied directly to the analog ground plane.

13, 14 REF

The reference inputs must be kept free of noise with respect to AGND. The A/D sees a reference voltage equal

to the difference between REF

15

Data Input

The A/D configuration word is shifted into this input.

16

Digital Data Output The A/D conversion result is shifted out of this output.

17

CS

Chip Select Input

A logic low on this input enables data transfer.

18

CLK

Clock

This clock synchronizes the serial data transfer and controls A/D conversion rate.

19

SSO

System Shutdown

System Shutdown Output pin will go low when power shutdown is requested.

Output

20

Positive Supply

This supply must be kept free of noise and ripple by bypassing directly to the analog ground plane.

LTC1296