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LTC1294CCSW

Single Chip 12-Bit Data Acquisition System

Linear Technology 

LTC1293/LTC1294/LTC1296

APPLICATI S I FOR ATIO

Table 1a. LTC1294/6 Multiplexer Channel Selection

MUX ADDRESS

SGL/ ODD SELECT

DIFF SIGN 1 0

0 0 00

0 0 01

0 0 10

0 0 11

0 1 00

0 1 01

0 1 10

0 1 11

DIFFERENTIAL CHANNEL SELECTION

01 234 5 6 7

+–

+–

+–

+–

–+

–+

–+

–+

MUX ADDRESS

SGL/ ODD SELECT

DIFF SIGN 1 0

1 0 00

1 0 01

1 0 10

1 0 11

1 1 00

1 1 01

1 1 10

1 1 11

SINGLE-ENDED CHANNEL SELECTION

0 1 2 3 4 5 6 7 COM

+

–

+

–

+

–

+

–

+

–

+

–

+

–

+–

Table 1b. LTC1293 Channel Selection

MUX ADDRESS

SGL/ ODD SELECT

DIFF SIGN 1 0

0 0 00

0 0 01

0 0 10

0 0 11

0 1 00

0 1 01

0 1 10

0 1 11

DIFFERENTIAL CHANNEL SELECTION

0 12 34 5

+–

+–

+–

Not Used

–+

–+

–+

Not Used

MUX ADDRESS

SGL/ ODD SELECT

DIFF SIGN 1 0

1 0 00

1 0 01

1 0 10

1 0 11

1 1 00

11

11

01

10

1 1 11

SINGLE-ENDED CHANNEL SELECTION

0 1 2 3 4 5 COM

+

–

+

–

+

–

Not Used

+

–

+

–

+–

Not Used

Unipolar/Bipolar (UNI)

The UNI bit determines whether the conversion will be

unipolar or bipolar. When UNI is a logical one, a unipolar

conversion will be performed on the selected input volt-

age. When UNI is a logical zero, a bipolar conversion will

result. The input span and code assignment for each

conversion type are shown in the figures below:

Unipolar Transfer Curve (UNI = 1)

Unipolar Output Code (UNI = 1)

OUTPUT CODE

INPUT VOLTAGE

INPUT VOLTAGE (VREF = 5V)

111111111111

111111111110

•

•

•

000000000001

000000000000

VREF – 1LSB

VREF – 2LSB

•

•

•

1LSB

0V

4.9988V

4.9976V

•

•

•

0.0012V

0V

LTC1293 AI03a

111111111111

111111111110

•

•

•

000000000001

000000000000

VIN

LTC1293 AI03b

129346fs

11

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