OP97_07 Datasheet, PDF (12/16 Pages) Analog Devices – Low Power, High Precision Operational Amplifier

OP97
AC PERFORMANCE
The ac characteristics of the OP97 are highly stable over its full
operating temperature range. Unity-gain small-signal response
is shown in Figure 30. Extremely tolerant of capacitive loading
on the output, the OP97 displays excellent response even with
1000 pF loads (see Figure 31). In large signal applications, the
input protection diodes effectively short the input to the output
during the transients if the amplifier is connected in the usual
unity-gain configuration. The output enters short-circuit current
limit, with the flow going through the protection diodes.
Improved large signal transient response is obtained by using a
feedback resistor between the output and the inverting input.
Figure 32 shows the large-signal response of the OP97 in unity-
gain with a 10 kΩ feedback resistor. The unity-gain follower
circuit is shown in Figure 33.
The overcompensation pin (Pin 5) can be used to increase the
phase margin of the OP97 or to decrease gain bandwidth
product at gains greater than 10.
100
90
10
0%
20mV
5µs
Figure 30. Small Signal Transient Response
(CLOAD = 100 pF, AVCL = 1)
100
90
100
90
10
0%
2V
20µs
Figure 32. Large Signal Transient Response (AVCL = 1)
10kΩ
2
6
OP97
V_IN
3
V_OUT
Figure 33. Unity-Gain Follower
100
90
10
0%
20mV
5µs
Figure 34. Small Signal Transient Response with Overcompensation
(CLOAD = 1000 pF, AVCL = 1, COC = 220 pF)
10
0%
20mV
5µs
Figure 31. Small-Signal Transient Response
(CLOAD = 1000 pF, AVCL = 1)
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