LTC1290BMJ datasheet(11/28 Pages) LINER

Part #	LTC1290BMJ

Description	Single Chip 12-Bit Data Acquisition System

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Manufacturer	LINER [Linear Technology]

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11

LTC1290

S

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)

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

•

LTC1290 AI04b

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

0V

INPUT VOLTAGE

(VREF = 5V)

4.9988V

4.9976V

•

0.0012V

0V

LTC1290 • AI04a

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 = 5V)

–0.0024V

–0.0048V

•

–4.9976V

–5.0000V

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

0V

INPUT VOLTAGE

(VREF = 5V)

4.9976V

4.9851V

•

0.0024V

0V

LTC1290 AI05a

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

•

LTC1290 AI05b

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