Single-Supply, Rail-to-Rail

Low Power FET-Input Op Amp

Data Sheet

AD822

Rev. J

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FEATURES

True single-supply operation

Output swings rail-to-rail

Input voltage range extends below ground

Single-supply capability from 5 V to 30 V

Dual-supply capability from ±2.5 V to ±15 V

High load drive

Capacitive load drive of 350 pF, G = +1

Minimum output current of 15 mA

Excellent ac performance for low power

800 µA maximum quiescent current per amplifier

Unity-gain bandwidth: 1.8 MHz

Slew rate of 3 V/μs

Good dc performance

800 µV maximum input offset voltage

2 µV/°C typical offset voltage drift

25 pA maximum input bias current

Low noise

13 nV/√Hz at 10 kHz

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

CONNECTION DIAGRAM

1

2

3

4

8

7

6

5

AD822

OUT1

–IN1

+IN1

V–

V+

OUT2

–IN2

+IN2

Figure 1. 8-Lead PDIP (N Suffix);

8-Lead MSOP (RM Suffix);

and 8-Lead SOIC_N (R Suffix)

GENERAL DESCRIPTION

The AD822 is a dual precision, low power FET input op amp

that can operate from a single supply of 5 V to 30 V or from

dual supplies of ±2.5 V to ±15 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

while in the single-supply mode. Output voltage swing extends

to within 10 mV of each rail, providing the maximum output

dynamic range.

Offset voltage of 800 µV maximum, offset voltage drift of 2 µV/°C,

input bias currents below 25 pA, and low input voltage noise

provide dc precision with source impedances up to a gigaohm.

The 1.8 MHz unity-gain bandwidth, –93 dB total harmonic

distortion (THD) at 10 kHz, and 3 V/µs slew rate are provided

with a low supply current of 800 µA per amplifier.

FREQUENCY (Hz)

1

10

10k

1k

100

100

10

Figure 2. Input Voltage Noise vs. Frequency