Datasheet

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V
COM
OUTPUT
−
R
1
R
3
R
2
C
1
C
2
V
CC
10 F
(a) Using V
COM
to Bias a Single−Supply Filter Stage
(b) Using a Voltage Follower to Buffer V
COM
When Biasing Multiple Nodes
(c) Using an INA134 for DC−Coupled Output
x = L or R
10 F
Filtered
Output
OPA337
2
3
1
A
V
=
−1, where A
V
=
R
2
R
1
V
OUT
x
V
COM
V
COM
PC M 17 42
+
+
Buffered
V
COM
V
CC
V+
V−
V
CC
+
1/2
OPA2353
10 F
PC M 1742
25k
Ω
25k
Ω
49.9k
Ω
1%
25k
Ω
25k
Ω
SENSE
OUT
−IN
+IN
REF
x = L or R
10 F
To Low−Pass
Filter Stage
INA134
V
OUT
x
V
COM
PC M 17 42
+
µ
µ
µ
µ
PCM1742
SBAS176A – DECEMBER 2000 – REVISED APRIL 2005
One unbuffered common-mode voltage output pin, V
COM
(pin 10), is brought out for decoupling purposes. This
pin is nominally biased to a dc voltage level equal to V
CC
/2. This pin can be used to bias external circuits. An
example of using the V
COM
pin for external biasing applications is shown in Figure 27 .
Figure 27. Biasing External Circuits Using the V
COM
Pin
23