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AD825:  Low Cost, General-Purpose High Speed JFET Amplifier

Product Details


The AD825 is a superbly optimized operational amplifier for high speed, low cost and dc parameters, making it ideally suited for a broad range of signal conditioning and data acquisition applications. The ac performance, gain, bandwidth, slew rate and drive capability are all very stable over temperature. The AD825 also maintains stable gain under varying load conditions.

The unique input stage has ultralow input bias current and input current noise. Signals that go to either rail on this high performance input do not cause phase reversals at the output. These features make the AD825 a good choice as a buffer for MUX outputs, creating minimal offset and gain errors.

The AD825 is fully specified for operation with dual ±5 V and ±15 V supplies. This power supply flexibility, and the low supply current of 6.5 mA with excellent ac characteristics under all supply conditions, makes the AD825 well suited for many demanding applications.

FEATURES and BENEFITS

  • High Speed
    41 MHz, -3 dB bandwidth
    125 V/µs slew rate
    80 ns settling time
  • Input bias current of 20 pA and noise
    current of 10 fA/√Hz
  • Fully specified power supplies: ±5 V to ±15V
  • Input voltage noise of 12 nV/√Hz
  • Low distortion: -76 dB at 1 MHz
  • High output drive capability
    Drives unlimited capacitance load
    50 mA min output current
  • No phase reversal when input is
    at rail
  • Available in 8-lead SOIC

Pin Configuration Diagram for AD825

Documentation

Title Content Type File Type
AD825: Low Cost, General-Purpose High Speed JFET Amplifier Data Sheet (Rev G, 04/2014) (pdf, 407 kB) Data Sheets PDF
AN-108: 08: JFET-Input Amps are Unrivaled for Speed and Accuracy  (pdf, 499 kB) Application Notes PDF
AN-649: Using the Analog Devices Active Filter Design Tool  (pdf, 5301 kB) Application Notes PDF
AN-581: Biasing and Decoupling Op Amps in Single Supply Applications  (pdf, 166 kB) Application Notes PDF
AN-214: Ground Rules for High Speed Circuits  (pdf, 356 kB)
Layout and Wiring Are Critical in Video Converter Circuits.
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
MT-060: Choosing Between Voltage Feedback and Current Feedback Op Amps  (pdf, 62 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
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 Stability
An applet for demonstrating stability effects in opamp buffers.
Design Calculators HTML
AD825 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.

SampleSample & Buy

Price, packaging, availability

AD825 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD825ACHIPS Status: Production CHIPS OR DIE 0 Ind Tray, 100 - - Y  Material Info Notify Me Contact ADI
AD825AR Status: Last Time Buy 8 ld SOIC 8 Ind Tube, 98 $2.37 $2.02 N  Material Info PDN Purchase
AD825AR-16-REEL Status: Last Time Buy 16 ld SOIC - Wide 16 Ind Reel, 1000 - $3.01 N  Material Info PCN/PDN Purchase
AD825AR-16-REEL7 Status: Last Time Buy 16 ld SOIC - Wide 16 Ind Reel, 400 $3.56 $3.01 N  Material Info PCN/PDN Purchase Sample
AD825AR-REEL Status: Last Time Buy 8 ld SOIC 8 Ind Reel, 2500 - $2.02 N  Material Info PDN Purchase
AD825AR-REEL7 Status: Last Time Buy 8 ld SOIC 8 Ind Reel, 750 $2.37 $2.02 N  Material Info PDN Purchase
AD825ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $2.16 $1.84 Y  Material Info Notify Me Purchase
AD825ARZ-16 Status: Production 16 ld SOIC - Wide 16 Ind Tube, 47 $3.24 $2.75 Y  Material Info PCN Purchase
AD825ARZ-16-REEL Status: Production 16 ld SOIC - Wide 16 Ind Reel, 1000 - $2.75 Y  Material Info PCN Purchase
AD825ARZ-16-REEL7 Status: Production 16 ld SOIC - Wide 16 Ind Reel, 400 $3.24 $2.75 Y  Material Info PCN Purchase
AD825ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $1.84 Y  Material Info Notify Me Purchase
AD825ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 $2.16 $1.84 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.

AD825 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD825AR-EBZ Status: Production 8-Lead SOIC Bare Evaluation Board $18.25 Yes -
AD825ARZ Status: Production 8-Lead SOIC $3.03 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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