LTC1289C データシートの表示（PDF） - Linear Technology
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LTC1289C Datasheet PDF : 28 Pages
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LTC1289
APPLICATI S 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
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)
Unipolar Transfer Curve (UNI = 1)
OUTPUT CODE INPUT VOLTAGE
111111111111
111111111110
•
•
•
000000000001
000000000000
VREF – 1LSB
VREF – 2LSB
•
•
•
1LSB
0V
INPUT VOLTAGE
(VREF = 2.5V)
2.4994V
2.4988V
•
•
•
0.0006V
0V
LTC1289 AI04a
111111111111
111111111110
•
•
•
000000000001
000000000000
Bipolar Output Code (UNI = 0)
OUTPUT CODE INPUT VOLTAGE
011111111111
011111111110
•
•
•
000000000001
000000000000
VREF – 1LSB
VREF – 2LSB
•
•
•
1LSB
0V
INPUT VOLTAGE
(VREF = 2.5V)
2.4988V
2.4976V
•
•
•
0.0012V
0V
OUTPUT CODE INPUT VOLTAGE
111111111111
111111111110
•
•
•
100000000001
100000000000
–1LSB
–2LSB
•
•
•
–(VREF) + 1LSB
– (VREF)
INPUT VOLTAGE
(VREF = 2.5V)
–0.0012V
–0.0024V
•
•
•
–2.4988V
–2.5000V
LTC1289 AI05a
Bipolar Transfer Curve (UNI = 0)
VIN
LTC1289 AI04b
011111111111
011111111110
•
•
•
000000000001
000000000000
111111111111
111111111110
•
•
•
100000000001
100000000000
VIN
LTC1289 AI05b
11
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