AD381LH 查看數據表（PDF） - Analog Devices
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AD381LH Datasheet PDF : 8 Pages
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>Ys
')
-Vs
7°".' ~,.0.'
Figure 24c. A 0382 Unity Gain
Follower Pulse Response
(Small Signal)
Figure 25a. AO382 Overdrive
Recovery Test Circuit
Figure 25b. AO382 Overdrive
Recovery Response
40
+Vs
35
30
,
V,N
OBSOLETE 25
~.g
20
~
;J: 15
;:
~
'" 10
AD382
JIJ +-tlVV
-v,
VOUT
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
- INPUT DIFFERENTIAL VOLTAGE <V
Figure 26. Slew Rate vs. Input Voltage
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Figure 27a. AO381 Overdrive Recovery
Test Circuit
Figure 27b. AO381 Overdrive
Recovery Response
V,N
RL
VOUT
2kf!
J
~~~'
-Vs ~O.,.' ~'o.,
Rgum28a. AO381UnftyGam
Follower
Figure 28b. AO381 Unity Gain
Follower Large Signal Pulse
Response
Compensation Capacitor
The AD381 and AD382 have sufficient phase margin to insure
stability in most applications without compensation. However,
in applications with capacitive load, very high speed, low gain
or high resistor values (RIN"",5kO) the high frequency noise
rejection will be improved by adding a compensation capacitor.
The AD381 and AD382 have an input capacitance of 7pF.
When soldered on a printed circuit board or inserted in a socket
the total input capacitance could be lOpF. This input capacitance
can lower the 0° phase margin crossover point from 8MHz, as
shown in Figure IS, to around IMHz.
A scheme for compensating inverting and noninverting circuits
~. is shown in Figure 29. Choose CF = CIN
C,
Rl
I
-LI .
CON......
~
R2
AD381 OR
AD382
+/
(INCLUDE HIGH FREQUENCY
IMPEDANCE IN Rll
SQURCE
a. Inverting Amplifier
By adding a small compensation capacitor in the feedback loop
we can cancel the effects of the input capacitance and reduce
high frequency noise gain. 5 to lOpF will suffice in most appli-
C,
cations. In some current output, digital-to-analog converter
applications the output capacitance of the DAC may be 200pF
which would require a large compensation capacitor in the amplifier
)
feedback loop.
b. Noninverting Amplifier
Figure 29.
-6-
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