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LTC1283CS bảng dữ liệu(PDF) 9 Page - Linear Technology

tên linh kiện LTC1283CS
Giải thích chi tiết về linh kiện  3V Single Chip 10-Bit Data Acquisition System
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9
LTC1283
S
APPLICATI
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.
0
1
2
3
4
5
6
7
CHANNEL
COM (
–)
8 Single-Ended
+
+
+
+
+
+
+
0,1
CHANNEL
4 Differential
2,3
4,5
6,7
+ (–)
+
+ (–)
+ (–)
+ (–)
– (+)
– (+)
– (+)
– (+)
4
5
6
7
CHANNEL
COM (
–)
Combinations of Differential and Single-Ended
+
+
+
+
+
+
0,1
2,3
–
–
COM (UNUSED)
Changing the MUX Assignment “On the Fly”
COM (
–)
4,5
6,7
5,4
1ST CONVERSION
2ND CONVERSION
+
–
+
–
+
–
+
+
7
6
{
{
{
{
{
{
{
{
{
{
LTC1283 • F01
Figure 1. Examples of Multiplexer Options on the LTC1283
SGL/
DIFF
0
0
0
0
0
0
0
0
0DD/
SIGN
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
SELECT
0
0
1
0
1
0
1
0
1
0
+
–
7
–
+
1
–
+
2
+
–
3
–
+
4
+
–
5
–
+
6
+
–
MUX ADDRESS
DIFFERENTIAL CHANNEL SELECTION
SGL/
DIFF
1
1
1
1
1
1
1
1
0DD/
SIGN
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
SELECT
0
0
1
0
1
0
1
0
1
0
+
7
+
1
+
2
+
3
+
4
+
5
+
6
+
MUX ADDRESS
SINGLE-ENDED CHANNEL SELECTION
COM
–
–
–
–
–
–
–
–
Table 1. Multiplexer Channel Selection



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