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OP176GBC 데이터시트(PDF) 10 Page - Analog Devices

부품명 OP176GBC
상세설명  Bipolar/JFET, Audio Operational Amplifier
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OP176
REV. 0
–10–
Figure 33. Unity Gain Follower
Figure 34. Unity Gain Inverter
In inverting and noninverting applications, the feedback
resistance forms a pole with the source resistance and capaci-
tance (R
S and CS) and the OP176’s input capacitance (CIN), as
shown in Figure 35. With R
S and RF in the kΩ range, this pole
can create excess phase shift and even oscillation. A small
capacitor, C
FB, in parallel with RFB eliminates this problem.
By
setting R
S (CS + CIN) = RFB CFB, the effect of the feedback pole is
completely removed.
Figure 35. Compensating the Feedback Pole
Output Voltage Phase Reversal
Since the OP176’s input stage combines bipolar transistors for
low noise and p-channel JFETs for high speed performance, the
output voltage of the OP176 may exhibit phase reversal if either
of its inputs exceeds the specified negative common-mode input
voltage. This might occur in some applications where a trans-
ducer, or a system, fault might apply very large voltages upon
the inputs of the OP176. Even though the input voltage range
of the OP176 is
±10.5 V, an input voltage of approximately
–13.5 V will cause output voltage phase reversal. In inverting
amplifier configurations, the OP176’s internal 7.5 V clamping
diodes will prevent phase reversal; however, they will not
prevent this effect from occurring in noninverting applications.
For these applications, the fix is a 3.92 k
Ω resistor in series
with the noninverting input of the device and is illustrated in
Figure 31.
Figure 31. Output Voltage Phase Reversal Fix
Overdrive Recovery
The overdrive recovery time of an operational amplifier is the
time required for the output voltage to recover to a rated output
level from a saturated condition. This recovery time is impor-
tant in applications where the amplifier must recover quickly
after a large abnormal transient event. The circuit shown in
Figure 32 was used to evaluate the OP176’s overload recovery
time. The OP176 takes approximately 1
µs to recover to V
OUT =
+10 V and approximately 900 ns to recover to V
OUT = –10 V.
Figure 32. Overload Recovery Time Test Circuit
High Speed Operation
As with most high speed amplifiers, care should be taken with
supply decoupling, lead dress, and component placement.
Recommended circuit configurations for inverting and
noninverting applications are shown in Figure 33 and Figure 34.
VIN
RS
909
VOUT
RL
2.43kΩ
R2
10kΩ
R1
1kΩ
4Vp-p
@ 100Hz
6
2
3
OP176
+15V
+
10µF
0.1µF
2
3
7
6
4
VIN
VOUT
RL
2k
–15V
10µF
0.1µF
OP176
+15V
+
10µF
0.1µF
2
3
7
6
4
VIN
VOUT
2k
–15V
10µF
0.1µF
OP176
10pF
4.99k
2.49k
4.99k
+
CFB
RFB
CIN
VOUT
RS
CS
R
S
3.92k
R
L
2k
RFB*
VIN
VOUT
*RFB IS OPTIONAL
OP176
2
3
6


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