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AD822ARMZ-R2 数据表(PDF) 21 Page - Analog Devices

部件名 AD822ARMZ-R2
功能描述  Single-Supply, Rail-to-Rail Low Power FET-Input Op Amp
PDF  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD822ARMZ-R2 数据表(HTML) 21 Page - Analog Devices

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AD822
Rev. G | Page 21 of 28
90
... .
....
.... .... .... .... .... .... .... . ...
....
....
.... . ... . ... .... .... .... .... . ...
100
0%
10
20mV
2µs
Figure 46 shows a method for extending capacitance load drive
capability for a unity gain follower. With these component
values, the circuit drives 5000 pF with a 10% overshoot.
20pF
100Ω
20kΩ
8
4
VIN
+VS
0.01µF
VOUT
0.01µF
CL
1/2
AD822
+
–
–VS
Figure 44. Small Signal Response of AD822 as
Unity Gain Follower Driving 350 pF
Figure 46. Extending Unity Gain Follower Capacitive Load Capability
Beyond 350 pF
Figure 45 is a plot of capacitive load that results in a 20° phase
margin vs. noise gain for the AD822. Noise gain is the inverse of
the feedback attenuation factor provided by the feedback
network in use.
1
2
3
4
5
300
1k
3k
10k
30k
CAPACITIVE LOAD FOR 20° PHASE MARGIN (pF)
R1
RF
CL
Figure 45. Capacitive Load Tolerance vs. Noise Gain



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