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AD822AR-REEL Datasheet(PDF) 19 Page - Analog Devices

Part No. AD822AR-REEL
Description  Single-Supply, Rail-to-Rail Low Power FET-Input Op Amp
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD822AR-REEL Datasheet(HTML) 19 Page - Analog Devices

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AD822
Rev. I | Page 19 of 24
90
... .
....
.... .... .... .... .... .... .... . ...
....
....
.... . ... . ... .... .... .... .... . ...
100
0%
10
20mV
2µs
Figure 44. Small Signal Response of AD822 as
Unity-Gain Follower Driving 350 pF
Figure 45 is a plot of noise gain vs. capacitive load that results in
a 20° phase margin 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. Noise Gain vs. Capacitive Load Tolerance
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
100
20k
8
4
VIN
V+
0.01µF
VOUT
0.01µF
CL
1/2
AD822
+
V–
Figure 46. Extending Unity-Gain Follower Capacitive Load Capability
Beyond 350 pF
SINGLE-SUPPLY VOLTAGE-TO-FREQUENCY
CONVERTER
The circuit shown in Figure 47 uses the AD822 to drive a low
power timer that produces a stable pulse of width t1. The positive
going output pulse is integrated by R1 and C1 and used as one
input to the AD822 that is connected as a differential integrator.
The other input (nonloading) is the unknown voltage, VIN. The
AD822 output drives the timer trigger input, closing the overall
feedback loop.
2
3
4
6
5
U3A
U3B
C3
0.1µF
1
2
3
4
OUT2
OUT1
U1
C1
U2
CMOS 555
THR
TR
DIS
GND
OUT
CV
1
2
3
4
5
6
7
8
RV+
C4
0.01µF
R3
116k
0.01µF, 2%
CMOS
74HCO4
RSCALE
10k
U4
REF02
VREF = 5V
10V
C5
0.1µF
R2
499k
1%
R1
499k
1%
VIN
C2
0.01µF
2%
0V TO 2.5V
FULL SCALE
1/2
AD822B
+
NOTES
1. fOUT = VIN/(VREF × t1), t1 = 1.1 × R3 × C6.
2. R3 = 1% METAL FILM <50ppm/°C TC.
3. RSCALE = 10% 20T FILM <100ppm/°C TC.
4. t1 = 33µF FOR fOUT = 20kHz @ VIN = 2.0V.
= 25kHz
fS AS SHOWN.
Figure 47. Single-Supply Voltage-to-Frequency Converter
Typical AD822 bias currents of 2 pA allow MΩ range source
impedances with negligible dc errors. Linearity errors on the
order of 0.01% full scale can be achieved with this circuit. This
performance is obtained with a 5 V single supply that delivers
less than 1 mA to the entire circuit.


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