AD822ARMZ-R2 datasheet(21/28 Pages) AD

Part #	AD822ARMZ-R2

Description	Single-Supply, Rail-to-Rail Low Power FET-Input Op Amp

PDF	28 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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21 / 28 page

AD822

Rev. G | Page 21 of 28

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100

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

VIN

+VS

0.01µF

VOUT

0.01µF

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.

300

10k

30k

CAPACITIVE LOAD FOR 20° PHASE MARGIN (pF)

Figure 45. Capacitive Load Tolerance vs. Noise Gain

AD822ARMZ-R2 Datasheet(PDF) 21 Page - Analog Devices