LTC1090CN Ver la hoja de datos (PDF) - Linear Technology
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LTC1090CN Datasheet PDF : 28 Pages
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LTC1090
APPLICATIO S I FOR ATIO
CHANNEL
0,1
2,3
4,5
6,7
4 Differential
+( – )
–( + )
+( – )
–( + )
+( – )
–( + )
+( – )
–( + )
LTC1090 • AI04A
8 Single Ended
Combinations of Differential and Single Ended
CHANNEL
0
+
1
+
2
+
3
+
4
+
5
+
6
+
7
+
COM ( – )
CHANNEL
0,1
2,3
4
5
6
7
+
–
–
+
+
+
+
+
COM ( – )
LTC1090 • AI04B
Changing the MUX Assignment “On the Fly”
LTC1090 • AI04C
+
4,5
–
+
6,7
–
COM (UNUSED)
–
5,4
+
6
+
7
+
COM ( – )
1ST CONVERSION
2ND CONVERSION
LTC1090 • AI04D
LTC1090 • AI04E
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)
1111111111
1111111110
0000000001
0000000000
OV 1LSB
VREF – 2LSB VREF
VREF – 1LSB
Bipolar Transfer Curve (UNI = 0)
VIN
LTC1090 • AI05
– VREF +1LSB
– VREF
0111111111
0111111110
0000000001
0000000000
1LSB
– 1LSB
– 2LSB
1111111111
1111111110
1000000001
1000000000
VIN
VREF – 2LSB VREF
VREF – 1LSB
LTC1090 • AI06
1090fc
11
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