LTC1283 データシートの表示（PDF） - Linear Technology
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LTC1283 Datasheet PDF : 24 Pages
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LTC1283
APPLICATI S I FOR ATIO
Multiplexer (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 indicted 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. Figure
1 shows some examples of multiplexer assignments.
Table 1. Multiplexer Channel Selection
MUX ADDRESS
SGL/ 0DD/ SELECT
DIFF SIGN 1 0
0
00 0
0
00 1
0
01 0
0
01 1
0
10 0
0
10 1
0
11 0
0
11 1
DIFFERENTIAL CHANNEL SELECTION
0 1 23 4 5 6 7
+–
+–
+–
+–
–+
–+
–+
–+
MUX ADDRESS
SGL/ 0DD/ SELECT
DIFF SIGN 1 0
1
00 0
1
00 1
1
01 0
1
01 1
1
10 0
1
10 1
1
11 0
1
11 1
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 (–)
LTC1283 • F01
2ND CONVERSION
Figure 1. Examples of Multiplexer Options on the LTC1283
9
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