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LTC1283

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

APPLICATI

I FOR ATIO

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.

Bipolar Transfer Curve (UNI = 0)

1LSB

VREF – 2LSB

VREF – 1LSB

VREF

VIN

1 1 1 1 1 1 1 1 1 1

0 0 0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0 0 0

0 1 1 1 1 1 1 1 1 0

0 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 0

1 0 0 0 0 0 0 0 0 1

1 0 0 0 0 0 0 0 0 0

–1LSB

–2LSB

–VREF

–VREF + 1LSB

LTC1283 AI05

1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 0

•

1 0 0 0 0 0 0 0 0 1

1 0 0 0 0 0 0 0 0 0

–1LSB

–2LSB

•

–(VREF) + 1LSB

–(VREF)

– 0.0049V

– 0.0098V

•

–2.4951V

–2.5000V

OUTPUT CODE

0 1 1 1 1 1 1 1 1 1

0 1 1 1 1 1 1 1 1 0

•

0 0 0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0 0 0

INPUT VOLTAGE

VREF – 1LSB

VREF – 2LSB

•

1LSB

INPUT VOLTAGE

(VREF = 2.5V)

2.4951V

2.4902V

•

0.0049V

LTC1283 AI07

Bipolar Output Code (UNI = 0)

Unipolar Transfer Curve (UNI = 1)

1LSB

VREF – 2LSB

VREF – 1LSB

VREF

VIN

0 0 0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0 0 0

1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 0

•

LTC1283 AI04

Unipolar Output Code (UNI = 1)

OUTPUT CODE

1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 0

•

0 0 0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0 0 0

INPUT VOLTAGE

VREF – 1LSB

VREF – 2LSB

•

1LSB

INPUT VOLTAGE

(VREF = 2.5V)

2.4976V

2.4951V

•

0.0024V

LTC1283 AI06

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