LTC1290(Rev_C) データシートの表示（PDF） - Linear Technology
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LTC1290 Datasheet PDF : 28 Pages
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LTC1290
APPLICATI S I FOR ATIO
MUX Address
The first four bits of the input word assign the MUX
configuration for the requested conversion. For a given
channel selection, the converter will measure the voltage
between the two channels indicated by the + and – signs
in the selected row of Table 1. Note that in differential
mode (SGL/DIFF = 0) measurements are limited to four
adjacent input pairs with either polarity. In single-ended
mode, all input channels are measured with respect to
COM.
Table 1. Multiplexer Channel Selection
MUX ADDRESS
SGL/ ODD SELECT
DIFF SIGN 1 0
0 0 00
0 0 01
0 0 10
0 0 11
0 1 00
0 1 01
0 1 10
0 1 11
DIFFERENTIAL CHANNEL SELECTION
01 2 3 4 5 6 7
+–
+–
+–
+–
–+
–+
–+
–+
MUX ADDRESS
SGL/ ODD SELECT
DIFF SIGN 1 0
1 0 00
1 0 01
1 0 10
1 0 11
1 1 00
1 1 01
1 1 10
1 1 11
SINGLE-ENDED CHANNEL SELECTION
0 1 2 3 4 5 6 7 COM
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+–
4 Differential
CHANNEL
{ 0,1
{ 2,3
{ 4,5
{ 6,7
+ (–)
– (+)
+ (–)
– (+)
+ (–)
– (+)
+ (–)
– (+)
8 Single-Ended
CHANNEL
0
+
1
+
2
+
3
+
4
+
5
+
6
+
7
+
COM (–)
Combinations of Differential and Single-Ended
CHANNEL
{ 0,1
+
–
{ 2,3
–
+
4+
5
+
6+
7+
COM (–)
Changing the MUX Assignment “On the Fly”
{ 4,5
+
–
{ 6,7
+
–
COM (UNUSED)
1ST CONVERSION
{ 5,4
–
+
6
7
{
+
+
COM (–)
2ND CONVERSION
Figure 1. Examples of Multiplexer Options on the LTC1290
LTC1290 • F01
10
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