Single-Supply, Rail-to-Rail
Low Power FET-Input Op Amp
AD822
FEATURES
CONNECTION DIAGRAM
True single-supply operation
Output swings rail-to-rail
Input voltage range extends below ground
Single-supply capability from 3 V to 36 V
Dual-supply capability from 1.ꢀ V to 18 V
High load drive
8
7
6
5
OUT1
–IN1
+IN1
1
2
3
4
V+
OUT2
–IN2
V–
+IN2
AD822
Figure 1. 8-Lead PDIP (N Suffix); 8-Lead MSOP (RM Suffix);
and 8-Lead SOIC (R Suffix)
Capacitive load drive of 3ꢀ0 pF, G = +1
Minimum output current of 1ꢀ mA
Excellent ac performance for low power
800 μA maximum quiescent current per amplifier
Unity gain bandwidth: 1.8 MHz
Slew rate of 3.0 V/ꢁs
GENERAL DESCRIPTION
The AD822 is a dual precision, low power FET input op amp
that can operate from a single supply of 3.0 V to 36 V or dual
supplies of ±±.ꢀ V to ±±8 V. It has true single-supply capability
with an input voltage range extending below the negative rail,
allowing the AD822 to accommodate input signals below
ground in the single-supply mode. Output voltage swing
extends to within ±0 mV of each rail, providing the maximum
output dynamic range.
Good dc performance
800 μV maximum input offset voltage
2 μV/°C typical offset voltage drift
2ꢀ pA maximum input bias current
Low noise
13 nV/√Hz @ 10 kHz
100
10
1
No phase inversion
APPLICATIONS
Battery-powered precision instrumentation
Photodiode preamps
Active filters
12-bit to 14-bit data acquisition systems
Medical instrumentation
Low power references and regulators
10
100
FREQUENCY (Hz)
10k
1k
Figure 2. Input Voltage Noise vs. Frequency
Offset voltage of 800 μV maximum, offset voltage drift of 2 μV/°C,
input bias currents below 2ꢀ pA, and low input voltage noise
provide dc precision with source impedances up to a gigaohm. The
±.8 MHz unity gain bandwidth, –93 dB THD at ±0 kHz, and 3 V/μs
slew rate are provided with a low supply current of 800 μA per
amplifier.
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Rev. G
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