GENERAL DESCRIPTION：

The AD8021 is an exceptionally high performance, high speedvoltage feedback amplifier that can be used in 16-bit resolutionsystems. It is designed to have both low voltage and low currentnoise (2.1 nV/√Hz typical and 2.1 pA/√Hz typical) while operatingat the lowest quiescent supply current (7 mA @ ±5 V) amongtoday’s high speed, low noise op amps. The AD8021 operatesover a wide range of supply voltages from ±2.25 V to ±12 V, aswell as from single 5 V supplies, making it ideal for high speed,low power instruments. An output disable pin allows furtherreduction of the quiescent supply current to 1.3 mA. 

The AD8021 allows the user to choose the gain bandwidthproduct that best suits the application. With a single capacitor,the user can compensate the AD8021 for the desired gain withlittle trade-off in bandwidth. The AD8021 is a well-behavedamplifier that settles to 0.01% in 23 ns for a 1 V step. It has a fastoverload recovery of 50 ns.The AD8021 is stable over temperature with low input offsetvoltage drift and input bias current drift, 0.5 μV/°C and 10 nA/°C,respectively. The AD8021 is also capable of driving a 75 Ω linewith ±3 V video signals.The AD8021 is both technically superior and priced considerablyless than comparable amps drawing much higher quiescentcurrent. The AD8021 is a high speed, general-purpose amplifier,ideal for a wide variety of gain configurations and can be usedthroughout a signal processing chain and in control loops. TheAD8021 is available in both standard 8-lead SOIC and MSOPpackages in the industrial temperature range of −40°C to +85°C. 

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