Overview
Features and Benefits
- 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
Product Details
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.
Product Categories
Markets and Technologies
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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AD8021: Low Noise, High Speed Amplifier for 16-Bit Systems Data Sheet (Rev. F)8/13/2001PDF579 kB
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Understanding PulSAR ADC Support Circuitry7/30/2020
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AN-1502: Driving the AD7366/AD7367 Bipolar SAR ADC in Low Distortion DC-Coupled Applications (Rev. B)11/15/2017PDF126 K
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AN-357: Operational Integrators2/14/2015PDF272 kB
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AN-253: Find Op Amp Noise with Spreadsheet2/14/2015PDF77 kB
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AN-402: Replacing Output Clamping Op Amps with Input Clamping Amps2/14/2015PDF55 kB
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AN-581: Biasing and Decoupling Op Amps in Single Supply Applications (Rev. 0)2/14/2015PDF166 kB
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AN-356: User's Guide to Applying and Measuring Operational Amplifier Specifications2/14/2015PDF538 kB
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AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)2/14/2015PDF76 K
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AN-257: Careful Design Tames High Speed Op Amps2/14/2015PDF611 kB
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AN-358: Noise and Operational Amplifier Circuits2/14/2015PDF593 kB
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MT-053: Op Amp Distortion: HD, THD, THD + N, IMD, SFDR, MTPR2/14/2015PDF104 kB
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MT-052: Op Amp Noise Figure: Don't Be Misled2/14/2015PDF60 kB
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MT-050: Op Amp Total Output Noise Calculations for Second-Order System2/14/2015PDF38 kB
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MT-049: Op Amp Total Output Noise Calculations for Single-Pole System2/14/2015PDF40 kB
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MT-048: Op Amp Noise Relationships: 1/f Noise, RMS Noise, and Equivalent Noise Bandwidth2/14/2015PDF81 kB
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MT-047: Op Amp Noise2/14/2015PDF72 kB
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MT-060: Choosing Between Voltage Feedback and Current Feedback Op Amps2/14/2015PDF62 kB
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MT-059: Compensating for the Effects of Input Capacitance on VFB and CFB Op Amps Used in Current-to-Voltage Converters2/14/2015PDF69 kB
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MT-033: Voltage Feedback Op Amp Gain and Bandwidth2/14/2015PDF251 kB
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MT-058: Effects of Feedback Capacitance on VFB and CFB Op Amps2/14/2015PDF66 kB
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MT-056: High Speed Voltage Feedback Op Amps2/3/2009PDF109 kB
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MT-032: Ideal Voltage Feedback (VFB) Op Amp12/11/2008PDF65 kB
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SAR ADC & Driver Quick-Match Guide9/13/2013PDF251 kB
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High Speed Amplifiers Selection Table2/27/2008PDF77 kB
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New High-Resolution Multiplying DACs Excel at Handling AC Signals9/1/2010 Analog Dialogue
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Low-Cost Video Multiplexing Using High-Speed Amplifiers1/1/2009 Analog Dialogue
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Amplifier Input Protection... Friend or Foe?5/1/2007 Analog Dialogue
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High Speed Op Amp Drives a 16-Bit, 1-MSPS Differential-Input A/D Converter11/1/2002 Analog Dialogue
Tools & Simulations
Precision ADC Driver Tool
The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input
SPICE Models
CIR
AD8021 SPICE Macro Model
2.9 K
Design Tools
OpAmp Error Budget Calculator
An online tool to illustrate range, gain and accuracy issues with Op Amp.
Analog Filter Wizard
Use the Analog Filter Wizard to design low-pass, high-pass, or band-pass filters with actual op amps in minutes. As you progress through the design process, you can observe the characteristics of your filter design from ideal specifications to real world circuit behavior. Quickly evaluate the tradeoffs in op amp specifications - including gain-bandwidth, noise, and supply current – to determine the best filter design for your requirements.
Analog Photodiode Wizard
Use Photodiode Wizard to design a transimpedance amplifier circuit to interface with a photodiode. Select a photodiode from the library included in the tool, or enter custom photodiode specifications. Quickly observe tradeoffs between Bandwidth, Peaking (Q), and ENOB/SNR. Modify circuit parameters, and immediately see results in plots for pulse response, frequency response, and noise gain.
VRMS/dBm/dBu/dBV calculators
A utility to convert between standard units of power measurement and signal strength.
Power Dissipation vs Die Temp
This tool estimates die temperature and power dissipation based on the supply voltages, ambient temperature, load characteristics, and package thermal data.
Reference Designs (1)
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
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List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.