GENERAL DESCRIPTION
The AD820 is a precision, low power FET input op amp that can operate from a single supply of 5.0 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 36 V
  Dual-supply capability from ±2.5 V to ±18 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 3.0 V/μs
Excellent dc performance
  800 μV maximum input offset voltage
  1 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- to 14-bit data acquisition systems
Medical instrumentation
Low power references and regulators