AD822ANZ Analog Devices Inc, AD822ANZ Datasheet - Page 19

• Manufacturer Part Number: AD822ANZ
• Description: IC OPAMP GP R-R 1.9MHZ DUAL 8DIP
• Manufacturer: Analog Devices Inc

Specifications of AD822ANZ

• Slew Rate: 3 V/µs
• Design Resources: 16-Bit Fully Isolated 4 mA to 20 mA Output Module Using AD5662, ADuM1401, and External Amplifiers (CN0064)
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 1.9MHz
• -3db Bandwidth: 1.9MHz
• Current - Input Bias: 2pA
• Voltage - Input Offset: 400µV
• Current - Supply: 1.4mA
• Current - Output / Channel: 20mA
• Voltage - Supply, Single/dual (±): 3 V ~ 36 V, ±1.5 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Op Amp Type: Precision
• No. Of Amplifiers: 2
• Bandwidth: 1.8MHz
• Supply Voltage Range: ± 1.5V To ± 18V
• Amplifier Case Style: DIP
• No. Of Pins: 8
• Common Mode Rejection Ratio: 80
• Current, Input Bias: 2 pA
• Current, Input Offset: 2 pA
• Current, Output: 20 mA
• Harmonic Distortion: -85 dB
• Impedance, Thermal: 90 °C/W
• Number Of Amplifiers: Dual
• Package Type: PDIP-8
• Resistance, Input: 10^13 Ohms
• Temperature, Operating, Range: -40 to +85 °C
• Voltage, Input: +14 V
• Voltage, Noise: 25 nV/sqrt Hz
• Voltage, Offset: 0.4 mV
• Voltage, Output, High: 800 mV
• Voltage, Output, Low: 300 mV
• Voltage, Supply: ±15 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

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.
100
0%
90
10
5
4
3
2
1
300
. . . .
. . . .
Figure 45. Noise Gain vs. Capacitive Load Tolerance
Figure 44. Small Signal Response of AD822 as
. . . .
. . . .
CAPACITIVE LOAD FOR 20° PHASE MARGIN (pF)
20mV
Unity-Gain Follower Driving 350 pF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1k
R1
R
F
3k
2µs
10k
C
L
30k
Rev. I | Page 19 of 24
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.
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 t
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, V
AD822 output drives the timer trigger input, closing the overall
feedback loop.
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.
FULL SCALE
C5
0.1µF
Figure 46. Extending Unity-Gain Follower Capacitive Load Capability
0V TO 2.5V
V
3
IN
V
IN
10V
4
2
Figure 47. Single-Supply Voltage-to-Frequency Converter
499kΩ
5
0.01µF
6
499kΩ
R1
1%
V
REF
REF02
2%
1%
C2
R2
U4
R
10kΩ
= 5V
SCALE
+
–
20kΩ
AD822
1/2
+
AD822B
–
8
4
V+
V–
U1
NOTES
1. f
2. R3 = 1% METAL FILM <50ppm/°C TC.
3. R
4. t
1/2
OUT
1
SCALE
0.01µF
CMOS
74HCO4
4
= 33µF FOR f
0.01µF
0.01µF, 2%
20pF
Beyond 350 pF
U3B
= V
= 25kHz
C1
= 10% 20T FILM <100ppm/°C TC.
IN /
3
(V
REF ×
116kΩ
f
S
U3A
2
OUT
100Ω
AS SHOWN.
R3
t
1
= 20kHz @ V
), t
6
2
7
1
1
= 1.1
THR
DIS
TR
R
4
U2
CMOS 555
GND
×
R3
1
C
IN
OUT
V+
L
CV
×
1
8
= 2.0V.
C3
0.1 µF
. The positive
C6.
3
5
V
OUT
AD822
C4
0.01µF
IN
OUT2
OUT1
. The