GENERAL DESCRIPTION

The AD820 is a precision, low power FET input op amp that can operate from a single supply of 5 V to 36 V, or dual supplies of ±2.5 V to ±18 V. It has true single-supply capability, with an input voltage range extending below the negative rail, allowing the AD820 to accommodate input signals below ground in the single-supply mode. Output voltage swing extends to within 10 mV of each rail, providing the maximum output dynamic range.

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

Excellent load drive

Capacitive load drive up to 350 pF

Minimum output current of 15 mA

Excellent ac performance for low power

800 μA maximum quiescent current

Unity-gain bandwidth: 1.8 MHz

Slew rate of 3 V/μs

Excellent 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 @ 10 kHz

APPLICATIONS

Battery-powered precision instrumentation

Photodiode preamps

Active filters

12-bit to 14-bit data acquisition systems

Medical instrumentation

Low power references and regulators