AD820

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 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. Offset voltage of 800 μV maximum, offset voltage drift of 2 μV/°C, typical input bias currents below 25 pA, and low input voltage noise provide dc precision with source impedances up to 1 GΩ. 1.8 MHz unity gain bandwidth, −93 dB THD at 10 kHz, and 3 V/μs slew rate are provided for a low su...