Low Noise, High Speed Amplifier for 16-Bit Systems

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.

The AD8021 is both technically superior and priced considerably less than comparable amps drawing much higher quiescent current. The AD8021 is a high speed, general-purpose amplifier, ideal for a wide variety of gain configurations, and can be used throughout a signal processing chain and in control loops. The AD8021 is available in both standard 8-lead SOIC and MSOP packages in the industrial temperature range of -40°C to +85°C.

* 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 typ for 5 V supply

34 mW or 6.7 mA typ for 5 V supply

* Low distortion

-93 dBc second harmonic, fc = 1 MHz

-108 dBc third harmonic, fc = 1 MHz

* DC precision

1 mV max 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