LTC1289BCSW datasheet(11/28 Pages) LINER

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LTC1289

1289fb

APPLICATI

I FOR ATIO

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

Unipolar Transfer Curve (UNI = 1)

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 Output Code (UNI = 1)

Bipolar Transfer Curve (UNI = 0)

Bipolar Output Code (UNI = 0)

OUTPUT CODE

1 1 1 1 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 0 0 1

0 0 0 0 0 0 0 0 0 0 0 0

INPUT VOLTAGE

VREF – 1LSB

VREF – 2LSB

•

1LSB

INPUT VOLTAGE

(VREF = 2.5V)

2.4994V

2.4988V

•

0.0006V

LTC1289 AI04a

VIN

0 0 0 0 0 0 0 0 0 0 0 1

0 0 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 1 1 1 1 0

•

LTC1289 AI04b

VIN

1 1 1 1 1 1 1 1 1 1 1 1

0 0 0 0 0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0 0 0 0 0

0 1 1 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 1 1 1 1 0

•

1 0 0 0 0 0 0 0 0 0 0 1

1 0 0 0 0 0 0 0 0 0 0 0

•

LTC1289 AI05b

OUTPUT CODE

1 1 1 1 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 0 0 1

1 0 0 0 0 0 0 0 0 0 0 0

INPUT VOLTAGE

–1LSB

–2LSB

•

–(VREF) + 1LSB

– (VREF)

INPUT VOLTAGE

(VREF = 2.5V)

–0.0012V

–0.0024V

•

–2.4988V

–2.5000V

OUTPUT CODE

0 1 1 1 1 1 1 1 1 1 1 1

0 1 1 1 1 1 1 1 1 1 1 0

•

0 0 0 0 0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0 0 0 0 0

INPUT VOLTAGE

VREF – 1LSB

VREF – 2LSB

•

1LSB

INPUT VOLTAGE

(VREF = 2.5V)

2.4988V

2.4976V

•

0.0012V

LTC1289 AI05a

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