Datasheet

11
LTC1090
1090fc
4 Differential 8 Single Ended Combinations of Differential and Single Ended
Changing the MUX Assignment “On the Fly”
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)
Bipolar Transfer Curve (UNI = 0)
APPLICATIO S I FOR ATIO
WUUU
LTC1090 • AI04A
0,1
CHANNEL
2,3
4,5
6,7
+( – )
–( + )
+( – )
–( + )
+( – )
–( + )
+( – )
–( + )
LTC1090 • AI04B
CHANNEL
0
1
2
3
4
5
6
7
COM ( – )
+
+
+
+
+
+
+
+
LTC1090 • AI04C
+
+
+
+
0,1
CHANNEL
2,3
4
5
6
7
+
–
+
–
COM (
–
)
LTC1090 • AI04D
4,5
6,7
–
+
–
+
COM (UNUSED)
1ST CONVERSION
LTC1090 • AI04E
5,4
6
7
–
+
+
+
COM (
–
)
2ND CONVERSION
LTC1090 • AI05
1111111111
1111111110
0000000001
0000000000
OV 1LSB
V
REF
– 2LSB
V
REF
– 1LSB
V
REF
V
IN
LTC1090 • AI06
0111111111
0111111110
1111111111
1111111110
0000000001
0000000000
1000000001
1000000000
V
REF
– 2LSB
–V
REF
+1LSB
V
REF
– 1LSB
V
REF
–V
REF
V
IN
–2LSB
–1LSB
1LSB