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AD8021ARZ

Low-noise 200MHz op-amp, 2.1nV/sqrtHz, 16-bit systems, 8-SOIC

7890

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Manufacturer Part：

AD8021ARZ

Package：

8-SOIC (5.0 x 4.0 mm)

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Description

Product Overview

The AD8021ARZ from Analog Devices is a low-noise, high-speed voltage feedback amplifier designed for 16-bit resolution systems. Available in an 8-lead SOIC package, it delivers 200MHz bandwidth at G=-1 with only 2.1nV/sqrtHz input voltage noise and 6.7mA supply current.

Key Specifications

Bandwidth 200MHz (G=-1)
Input Voltage Noise 2.1 nV/sqrtHz
Input Current Noise 2.1 pA/sqrtHz
Supply Voltage 5V to 24V (+-2.25V to +-12V)
Supply Current 6.7mA (typical)
Input Offset Voltage 1mV max
Package 8-SOIC
Operating Temperature -40°C ~ 85°C

Features

  • Low noise: 2.1 nV/sqrtHz voltage noise
  • High speed: 200MHz at G=-1
  • Low power: 34mW on 5V supply
  • Low distortion: -93 dBc HD2 at 1MHz
  • Custom compensation for bandwidth control
  • Output disable function (1.3mA standby)

Applications

  • 16-bit ADC driver circuits
  • High-speed signal processing chains
  • Medical imaging systems
  • Test and measurement instrumentation
  • Active filter and integrator circuits

The AD8021 is an exceptionally high-performance voltage feedback amplifier optimized for 16-bit resolution systems. It combines the industry’s lowest voltage noise (2.1 nV/sqrtHz) with low current noise (2.1 pA/sqrtHz) at a quiescent supply current of just 7mA on +/-5V rails. The amplifier supports supply voltages from +/-2.25V to +/-12V as well as single 5V operation. A compensation pin allows constant bandwidth from G=-1 to G=-10, and an output disable pin reduces supply current to 1.3mA when the amplifier is not in use.

The AD8021 uses a voltage feedback architecture with a custom compensation node that allows external capacitance to set the frequency response. The input stage employs a low-noise differential pair biased for optimal noise-speed tradeoff. At G=-1, the bandwidth reaches 200MHz with constant bandwidth maintained up to G=-10. The output stage provides low distortion (-93 dBc HD2 at 1MHz) suitable for driving 16-bit ADCs. The disable function opens the output and reduces quiescent current, enabling multiplexed signal chains.

Pin Name Type Function
1 COMP I/O Compensation capacitor
2 -IN Input Inverting input
3 +IN Input Non-inverting input
4 -VS Power Negative supply
5 DISABLE Input Output disable (active high)
6 OUTPUT Output Amplifier output
7 +VS Power Positive supply
8 NC – No connect
  • 16-bit SAR ADC driver with low distortion
  • High-speed signal processing front-ends
  • Medical imaging and ultrasound systems
  • Precision test and measurement equipment
  • Active filters requiring low noise and wide bandwidth
Manufacturer Part Number Package Notes
Analog Devices AD8021ARMZ 8-MSOP MSOP package option
Texas Instruments THS4551 8-VSSOP Low-noise FDA, 150MHz
Analog Devices ADA4899-1 8-SOIC Ultra-low noise, 600MHz
Texas Instruments OPA838 8-SOIC Low-noise, 300MHz
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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