OPA3832_07 Datasheet, PDF (20/32 Pages) Burr-Brown (TI) – Triple, Low-Power, High-Speed, Fixed-Gain Operational Amplifier

OPA3832
SBOS370 – DECEMBER 2006
HIGH-SPEED INSTRUMENTATION
AMPLIFIER
Figure 51 shows an instrumentation amplifier based
on the OPA3832. The offset matching between
inputs makes this an attractive input stage for this
application. The differential-to-single-ended gain for
this circuit is 2.0V/V. The inputs are high impedance,
with only 1pF to ground at each input. The loads on
the OPA3832 outputs are equal for the best
harmonic distortion possible.
V₁
1/3
OPA3832
400W
400W
400W
400W
1/3
OPA3832
V₂
200W
200W
1/3
OPA3832
400W
400W
V_OUT
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9
6
3
0
-3
-6
-9
-12
VOUT
20log
-15
|V₁ - V₂|
-18
1
10
100
400
Frequency (MHz)
Figure 52. High-Speed Instrumentation Amplifier
Response
Figure 51. High-Speed Instrumentation Amplifier
As shown in Figure 52, the OPA3832 used as an
instrumentation amplifier has a 55MHz, –3dB
bandwidth. This data plots a 1V_PP output signal using
a low-impedance differential input source.
20
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