PGA281
SBOS664A –MARCH 2013–REVISED JUNE 2013
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Application Examples
Multiplexed Data Acquisition
Figure 48 shows the PGA281 used in a multiplexed data-acquisition application.
Low-Pass
Filters
Ch 1
S1
15 V
+5 V
Ch 2
S2
50 ꢀ
Ref
Out
2.5 V
In+
+
Ch 3
S3
10 nF
2.5 V
Mux
Controller
ADS1259
PGA281
In-
50 ꢀ
-15 V
Ch x
Sx
Figure 48. Typical Block Diagram for Multiplexed Data Acquisition
Programmable Logic Controller (PLC) Input
An example of the PGA281 used in a programmable logic controller (PLC) input application is shown in
Figure 49 .
±10 V
100 kꢀ
+
VOP
2.5 V
VOUT = 2.5 V ± 1.8 V at G = 4
VOCM
VON
4.87 kꢀ
20 ꢀ
PGA281
4 mA to 20 mA
±20 mA
µC
Figure 49. ±10-V, 4-mA to 20-mA PLC Input
24
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