LTC1290BI LINER [Linear Technology], LTC1290BI Datasheet - Page 10

• Manufacturer Part Number: LTC1290BI
• Description: Single Chip 12-Bit Data Acquisition System
• Manufacturer: LINER [Linear Technology]

LTC1290
A
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
10
Table 1. Multiplexer Channel Selection
SGL/
DIFF
PPLICATI
0
0
0
0
0
0
0
0
MUX ADDRESS
SIGN
ODD
0
0
0
0
1
1
1
1
SELECT
CHANNEL
0,1
1 0
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
2,3
4,5
6,7
{
{
{
{
O
U
4 Differential
0
+
–
+
–
+
–
+
–
+
–
S
(
(
(
(
(
(
(
(
–
+
–
+
–
+
–
+
DIFFERENTIAL CHANNEL SELECTION
)
)
)
)
)
)
)
)
1
–
+
I FOR ATIO
U
4,5
6,7
{
{
+
–
2
Figure 1. Examples of Multiplexer Options on the LTC1290
1ST CONVERSION
+
+
–
–
COM (UNUSED)
3
–
+
W
Changing the MUX Assignment “On the Fly”
4
+
–
CHANNEL
5
–
+
0
1
2
3
4
5
6
7
U
+
–
6
8 Single-Ended
+
+
+
+
+
+
+
+
COM (
7
–
+
–
)
SGL/
DIFF
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.
5,4
1
1
1
1
1
1
1
1
MUX ADDRESS
6
7
{
{
SIGN
ODD
0
0
0
0
1
1
1
1
2ND CONVERSION
COM (
–
+
+
+
SELECT
1 0
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
–
Combinations of Differential and Single-Ended
)
CHANNEL
0,1
2,3
0
+
4
5
6
7
{
{
SINGLE-ENDED CHANNEL SELECTION
+
1
+
–
–
+
+
+
+
+
COM (
2
+
–
3
+
)
4
+
+
5
LTC1290 • F01
+
6
+
7
COM
–
–
–
–
–
–
–
–