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AD8021:  Low Noise, High Speed Amplifier for 16-Bit Systems

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.

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

Pin Configuration Diagram for AD8021

Documentation

Title Content Type File Type
AD8021: Low Noise, High Speed Amplifier for 16-Bit Systems Data Sheet  (Rev F, 05/2006) (pdf, 579 kB) Data Sheets PDF
AN-649: Using the Analog Devices Active Filter Design Tool  (pdf, 5301 kB) Application Notes PDF
AN-357: Operational Integrators  (pdf, 272 kB) Application Notes PDF
AN-581: Biasing and Decoupling Op Amps in Single Supply Applications  (pdf, 166 kB) Application Notes PDF
AN-358: Noise and Operational Amplifier Circuits  (pdf, 593 kB) Application Notes PDF
AN-356: User's Guide to Applying and Measuring Operational Amplifier Specifications  (pdf, 538 kB) Application Notes PDF
AN-402: Replacing Output Clamping Op Amps with Input Clamping Amps  (pdf, 55 kB)
So far most clamping amplifiers have relied upon an output clamping architecture and are called output clamp amps (OCAs). A new architecture called an input clamp amp (ICA) offers superior clamping accuracy and lower distortion.
Application Notes PDF
AN-417: Fast Rail-to-Rail Operational Amplifiers Ease Design Constraints in Low Voltage High Speed Systems  (pdf, 228 kB)
Movement towards lower power supply voltages is driven by the demand that systems consume less and less power coupled with the desire to reduce the number of power supply voltages in the system. The following applications are discussed: Single-Ended and Differential Input ADC Input Circuits, Video Line Driver, Active Filter, HDSL Transceiver, and Transformer Drive Circuits.
Application Notes PDF
AN-257: Careful Design Tames High Speed Op Amps  (pdf, 611 kB) Application Notes PDF
AN-253: Find Op Amp Noise with Spreadsheet  (pdf, 77 kB) Application Notes PDF
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change  (pdf, 76 kB) Application Notes PDF
CN-0260: Oversampled SAR ADC with PGA Achieving Greater Than 125 dB Dynamic Range  (pdf) Circuit Note PDF
CN-0042: Driving the AD7366/AD7367 Bipolar SAR ADC in Low-Distortion DC-Coupled  (pdf, 130 kB) Circuit Note PDF
MT-060: Choosing Between Voltage Feedback and Current Feedback Op Amps  (pdf, 62 kB) Tutorials PDF
MT-059: Compensating for the Effects of Input Capacitance on VFB and CFB Op Amps Used in Current-to-Voltage Converters  (pdf, 69 kB) Tutorials PDF
MT-058: Effects of Feedback Capacitance on VFB and CFB Op Amps  (pdf, 66 kB) Tutorials PDF
MT-056: High Speed Voltage Feedback Op Amps  (pdf, 109 kB) Tutorials PDF
MT-053: Op Amp Distortion: HD, THD, THD + N, IMD, SFDR, MTPR  (pdf, 104 kB) Tutorials PDF
MT-052: Op Amp Noise Figure: Don't Be Misled  (pdf, 60 kB) Tutorials PDF
MT-050: Op Amp Total Output Noise Calculations for Second-Order System  (pdf, 38 kB) Tutorials PDF
MT-049: Op Amp Total Output Noise Calculations for Single-Pole System  (pdf, 40 kB) Tutorials PDF
MT-048: Op Amp Noise Relationships: 1/f Noise, RMS Noise, and Equivalent Noise Bandwidth  (pdf, 81 kB) Tutorials PDF
MT-047: Op Amp Noise  (pdf, 72 kB) Tutorials PDF
MT-033: Voltage Feedback Op Amp Gain and Bandwidth  (pdf, 251 kB) Tutorials PDF
MT-032: Ideal Voltage Feedback (VFB) Op Amp  (pdf, 65 kB) Tutorials PDF
A Stress-Free Method for Choosing High-Speed Op Amps
A decision-tree approach to making the critical decision about high-speed op amp selection, including a look at some helpful tools.
Webcasts WEBCAST
UG-101: Evaluation Board User Guide  (pdf, 189 kB) User Guides PDF
Low-Cost Video Multiplexing Using High-Speed Amplifiers Analog Dialogue HTML
High Speed Op Amp Drives a 16-Bit, 1-MSPS Differential-Input A/D Converter
(Analog Dialogue, Vol. 36, No. 6, November/December 2002)
Analog Dialogue HTML
SAR ADC & Driver Quick-Match Guide  (pdf, 251 kB)
Find drivers for ADI's most popular single-ended and differential SAR ADCs based on your specific application conditions.
Product Selection Guide PDF
High Speed Amplifiers Selection Table  (pdf, 77 kB) Product Selection Guide PDF
What's the difference between, power-down, shutdown, standby, sleep mode or disable? FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
dBm/dBu/dBv Calculator
This calculator converts between standard units of power measurement and signal strength.
Utilities and Conversions HTML
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.
Utilities and Conversions HTML
ADIsimOpAmp™
This tool will help with the selection, evaluation and troubleshooting of voltage feedback Op-Amps. It uses typical data to model the behavior of a selected amplifier. It allows a user to select an amplifier, configure a circuit, apply a signal and evaluate the performance. It is useful for checking an amplifier's spec's such as Bandwidth, Slew Rate, Input/Output Range, Gain Error, Load Current, Stability Issues and DC Errors in a given circuit.
ADIsim Design/Simulation Tools HTML
OpAmp Error Budget Calculator
An online tool to illustrate range, gain and accuracy issues in simple opamp buffers.
Amplifier Error Budget Analysis HTML
OpAmp Stability
An applet for demonstrating stability effects in opamp buffers.
Design Calculators HTML
AD8021 SPICE Macro-Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

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Price, packaging, availability

AD8021 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8021AR Status: Production 8 ld SOIC 8 Ind Tube, 98 $1.77 $1.51 N  Material Info Notify Me Purchase
AD8021AR-REEL Status: Last Time Buy 8 ld SOIC 8 Ind Reel, 2500 - $1.51 N  Material Info PDN Purchase
AD8021AR-REEL7 Status: Last Time Buy 8 ld SOIC 8 Ind Reel, 1000 - $1.51 N  Material Info PDN Purchase
AD8021ARM Status: Last Time Buy 8 ld MSOP 8 Ind Tube, 50 $1.77 $1.51 N  Material Info PCN/PDN Purchase
AD8021ARM-REEL Status: Last Time Buy 8 ld MSOP 8 Ind Reel, 3000 - $1.51 N  Material Info PCN/PDN Purchase
AD8021ARM-REEL7 Status: Last Time Buy 8 ld MSOP 8 Ind Reel, 1000 - $1.51 N  Material Info PCN/PDN Purchase
AD8021ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $1.54 $1.31 Y  Material Info PCN Purchase Sample
AD8021ARMZ-REEL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $1.31 Y  Material Info PCN Purchase
AD8021ARMZ-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $1.31 Y  Material Info PCN Purchase
AD8021ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $1.54 $1.31 Y  Material Info Notify Me Purchase Sample
AD8021ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $1.31 Y  Material Info Notify Me Purchase
AD8021ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $1.31 Y  Material Info Notify Me Purchase
Price Table Help

The USA 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. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD8021 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8021AR-EBZ Status: Production 8-lead SOIC Evaluation Board $18.25 Yes -
AD8021ARZ Status: Production SOIC 150 MIL $2.15 Yes -

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.

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