INA111_07 BURR-BROWN [Burr-Brown Corporation], INA111_07 Datasheet - Page 10

• Manufacturer Part Number: INA111_07
• Description: High Speed FET-Input INSTRUMENTATION AMPLIFIER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

FIGURE 7. Bridge Transducer Amplifier.
mismatched values, causes a high frequency common-mode
signal to be converted to a differential signal. This degrades
common-mode rejection. The differential input capacitor,
C
mismatch in C
C
OUTPUT VOLTAGE SENSE
(SOL-16 Package Only)
The surface-mount version of the INA111 has a separate
output sense feedback connection (pin 12). Pin 12 must be
connected, usually to the output terminal, pin 11, for proper
operation. (This connection is made internally on the DIP
version of the INA111.)
The output feedback connection can be used to sense the
output voltage directly at the load for best accuracy. Figure 8
shows how to drive a load through series interconnection
resistance. Remotely located feedback paths may cause
instability. This can be generally be eliminated with a high
frequency feedback path through C
FIGURE 6. Input Low-Pass Filter.
3
2
V
V
, reduces the bandwidth and mitigates the effects of
. If properly matched, C
IN
IN
–
+
R
R
Bridge
+10V
1
2
®
1
INA111
and C
2
. Make C
C
C
C
1
3
2
100
R
1
G
and C
f
R
C
C
3
1
1
3
3 d B
much larger than C
2
= R
= C
1
also improve CMR.
10C
.
INA111
2
2
INA111
1
4 R
G = 500
Ref
Ref
1
C
1
3
V
O
V
C
1
2
O
1
and
10
FIGURE 8. Remote Load and Ground Sensing.
FIGURE 9. High-Pass Input Filter.
FIGURE 10. Galvanically Isolated Instrumentation
V
V
IN
IN
–
+
V
V
IN
IN
–
+
R
G
NOTE: To preserve good low frequency CMR,
make R
C
C
INA111
1
2
R
INA111
Common
Amplifier.
1
Isolated
1
Ref
Feedback
= R
Ref
Equal resistance here preserves
good common-mode rejection.
2
Isolated Power
±6V to ±18V
and C
Surface-mount package
version only.
V+
R
R
2
G
1
V–
= C
1000pF
2
.
C
1
INA111
ISO122
Ref
±15V
f
c
=
2 R
1
1
C
V
V
1
O
O
Load