GENERAL DESCRIPTION

The AD823 is a dual precision, 16 MHz, JFET input op amp that can operate from a single supply of 3.0 V to 36 V or from dual supplies of ±1.5 V to ±18 V. It has true single-supply capability with an input voltage range extending below ground in single-supply mode. Output voltage swing extends to within 50 mV of each rail for IOUT ≤ 100 µA, providing outstanding output dynamic range.

An offset voltage of 800 µV maximum, an 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. It provides 16 MHz, −3 dB bandwidth, −108 dB THD @ 20 kHz, and a 22 V/µs slew rate with a low supply current of 2.6 mA per amplifier. The AD823 drives up to 500 pF of direct capacitive load as a follower and provides an output current of 15 mA, 0.5 V from the supply rails. This allows the amplifier to handle a wide range of load conditions.

FEATURES

Single-supply operation

Output swings rail-to-rail

Input voltage range extends below ground

Single-supply capability from 3 V to 36 V

High load drive

Capacitive load drive of 500 pF, G = +1

Output current of 15 mA, 0.5 V from supplies

Excellent ac performance on 2.6 mA/amplifier

−3 dB bandwidth of 16 MHz, G = +1

350 ns settling time to 0.01 (2 V step)

Slew rate of 22 V/µs

Good dc performance

800 µV maximum input offset voltage

2 µV/°C offset voltage drift

25 pA maximum input bias current

Low distortion: −108 dBc worst harmonic @ 20 kHz

Low noise: 16 nV/√Hz @ 10 kHz

No phase inversion with inputs to the supply rails

APPLICATIONS

Battery-powered precision instrumentation

Photodiode preamps

Active filters

12-bit to 16-bit data acquisition systems

Medical instrumentation