GENERAL DESCRIPTION

The AD8021 is an exceptionally high performance, high speed voltage feedback amplifier that can be used in 16-bit resolution systems. It is designed to have both low voltage and low current

noise (2.1 nV/√Hz typical and 2.1 pA/√Hz typical) while operating at the lowest quiescent supply current (7 mA @ ±5 V) among today’s high speed, low noise op amps. The AD8021 operates

over a wide range of supply voltages from ±2.25 V to ±12 V, as well as from single 5 V supplies, making it ideal for high speed, low power instruments. An output disable pin allows further

reduction of the quiescent supply current to 1.3 mA. 

FEATURES

Low noise

  2.1 nV/√Hz input voltage noise

  2.1 pA/√Hz input current noise

Custom compensation

  Constant bandwidth from G = −1 to G = −10

High speed

  200 MHz (G = −1)

  190 MHz (G = −10)

Low power

  34 mW or 6.7 mA typical for 5 V supply

Output disable feature, 1.3 mA

Low distortion

  −93 dBc second harmonic, fC= 1 MHz

  −108 dBc third harmonic, fC= 1 MHz

DC precision

  1 mV maximum input offset voltage

  0.5 μV/°C input offset voltage drift

Wide supply range, 5 V to 24 V

Low price

Small packaging

  Available in SOIC-8 and MSOP-8



APPLICATIONS

ADC preamps and drivers

Instrumentation preamps

  Active filters

Portable instrumentation

Line receivers

Precision instruments

  Ultrasound signal processing

  High gain circuits