This document describes the features and characteristics of the Analog Devices AD823 dual, 16 MHz, rail-to-rail FET input amplifier. It features single supply operation, output swings rail to rail, input voltage range extends below ground, and single supply capability from +3V to +36V. Additionally, it has high load drive capacity, low distortion, and low noise. The product can be used in battery-powered precision instrumentation, photodiode preamps, active filters, 12- to 16-bit data acquisition systems, and medical instrumentation.