LTC1090CSW datasheet(11/28 Pages) LINER

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LTC1090

1090fc

4 Differential

8 Single Ended

Combinations of Differential and Single Ended

Changing the MUX Assignment “On the Fly”

Figure 1. Examples of Multiplexer Options on the LTC1090

Unipolar/Bipolar (UNI)

The fifth input bit (UNI) determines whether the conver-

sion will be unipolar or bipolar. When UNI is a logical one,

a unipolar conversion will be performed on the selected

input voltage. When UNI is a logical zero, a bipolar conver-

sion will result. The input span and code assignment for

each conversion type are shown in the figures below.

Unipolar Transfer Curve (UNI = 1)

Bipolar Transfer Curve (UNI = 0)

APPLICATIO S I FOR ATIO

LTC1090 • AI04A

0,1

CHANNEL

2,3

4,5

6,7

+( – )

–( + )

+( – )

–( + )

+( – )

–( + )

+( – )

–( + )

LTC1090 • AI04B

CHANNEL

COM ( – )

LTC1090 • AI04C

0,1

CHANNEL

2,3

–

COM (

– )

LTC1090 • AI04D

4,5

6,7

–

COM (UNUSED)

1ST CONVERSION

LTC1090 • AI04E

5,4

–

COM (

– )

2ND CONVERSION

LTC1090 • AI05

1111111111

1111111110

0000000001

0000000000

1LSB

VREF – 2LSB

VREF – 1LSB

VREF

VIN

LTC1090 • AI06

0111111111

0111111110

1111111111

1111111110

0000000001

0000000000

1000000001

1000000000

VREF – 2LSB

–VREF +1LSB

VREF – 1LSB

VREF

–VREF

VIN

– 2LSB

– 1LSB

1LSB

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