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AD621:  Low Drift, Low Power Instrumentation Amp with fixed gains of 10 and 100

Product Details


The AD621 is an easy to use, low cost, low power, high accuracy instrumentation amplifier which is ideally suited for a wide range of applications. Its unique combination of high performance, small size and low power, outperforms discrete in amp implementations. High functionality, low gain errors and low gain drift errors are achieved by the use of internal gain setting resistors. Fixed gains of 10 and 100 can be easily set via external pin strapping. The AD621 is fully specified as a total system, therefore, simplifying the design process.

For portable or remote applications, where power dissipation, size and weight are critical, the AD621 features a very low supply current of 1.3 mA max and is packaged in a compact 8-pin SOIC, 8-pin plastic DIP or 8-pin cerdip. The AD621 also excels in applications requiring high total accuracy, such as precision data acquisition systems used in weigh scales and transducer interface circuits. Low maximum error specifications including nonlinearity of 10 ppm, gain drift of 5 ppm°/C, 50 µV offset voltage and 0.6 mV/°C offset drift ("B" grade), make possible total system performance at a lower cost than has been previously achieved with discrete designs or with other monolithic instrumentation amplifiers.

When operating from high source impedances, as in ECG and blood pressure monitors, the AD621 features the ideal combination of low noise and low input bias currents. Voltage noise is specified as 9 nV/(root) Hz at 1 kHz and 0.28 µV p-p from 0.1 Hz to 10 Hz. Input current noise is also extremely low at 0.1 pA/Hz. The AD621 outperforms FET input devices with an input bias current specification of 1.5 nA max over the full industrial temperature range.

FEATURES and BENEFITS

  • EASY TO USE
    Pin-Strappable Gains of 10 and 100
    All Errors Specified for Total System Performance
    High Performance than Discrete In Amp Designs
    Available in 8-Lead DIP and SOIC
    Low Power, 1.3 mA Max Supply Current
    Wide Power Supply
  • LOW NOISE
    9 nV/vHz, @ 1 kHz, Input Voltage Noise
    0.28 µV p-p Noise (0.1 Hz to 10 Hz)
  • EXCELLENT DC PERFORMANCE
    0.15% Max, Total Gain Error
    ±5 ppm/°C, Total Gain Drift
    125 µV Max, Total Offset Voltage
    1.0 µV/°C Max, Offset Voltage Drift
  • EXCELLENT AC SPECIFICATIONS
    800 kHz Bandwidth (G = 10), 200 kHz (G = 100)
    12 µs Settling Time to 0.01%

Pin Configuration Diagram for AD621

Documentation

Title Content Type File Type
AD621: Low Drift, Low Power Instrumentation Amp with fixed gains of 10 and 100 Data Sheet  (Rev B, 01/2001) (pdf, 522 kB) Data Sheets PDF
AN-282: Fundamentals of Sampled Data Systems  (pdf, 2131 kB) Application Notes PDF
AN-244: A User's Guide to I.C. Instrumentation Amplifiers  (pdf, 522 kB) Application Notes PDF
AN-245: Instrumentation Amplifiers Solve Unusual Design Problems  (pdf, 543 kB)
Traditionally Considered Only for Transducer-Conditioning Applications, Instrumentation Amplifiers Bring Unique Performance Benefits to a Range of Other Applications as Well.
Application Notes PDF
AN-671: Reducing RFI Rectification Errors in In-Amp Circuits  (pdf, 208 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-589: Ways to Optimize the Performance of a Difference Amplifier  (pdf, 115 kB)
This Application Note presents several ways to build and optimize the performance of a discrete difference amplifier. It also recommends amplifiers that will make the overall solution cost/performance competitive with monolithic instrument amplifiers.
Application Notes PDF
A Designer's Guide to Instrumentation Amplifiers (3rd Edition) Design Handbooks HTML
UG-261: Evaluation Boards for the AD62x, AD822x and AD842x Series  (pdf, 604 kB) User Guides PDF
Auto-Zero Amplifiers  (doc, 75 kB)
A wide variety of electronic applications, especially those involving very small input signals, require signal paths with very low offset voltage and offset voltage drift over time and temperature.
Technical Articles DOC
High-performance Adder Uses Instrumentation Amplifiers
Make an adder circuit using instrumentation amplifiers to increase input impedance.
(EDN, 9/3/2009)
Technical Articles HTML
Low-Power, Low-Voltage IC Choices for ECG System Requirements
(Analog Dialogue, Vol. 29, No. 3, 1995)
Technical Articles HTML
Input Filter Prevents Instrumentation-amp RF-Rectification Errors
by Charles Kitchin, Lew Counts, and Moshe Gerstenhaber, Analog Devices, Inc. (EDN, 11/13/2003)
Technical Articles HTML
The AD8221 - Setting a New Industry Standard for Instrumentation Amplifiers  (pdf, 582 kB) Technical Articles PDF
Low-Power, Low-Voltage IC Choices for ECG System Requirements
(Analog Dialogue, Vol. 29, No. 3, 1995)
Analog Dialogue HTML
Applying Instrumentation Amplifiers Effectively: The Importance of an Input Ground Return  (pdf, 508 kB) Technical Documentation PDF
Leading Inside Advertorials: Applying Instrumentation Amplifiers Effectively–The Importance of an Input Ground Return  (pdf, 121 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
In-Amp Error Calculator
These tools will help estimate error contributions in your instrumentation amplifier circuit. It uses input parameters such as temperature, gain, voltage input, and source impedance to determine the errors that can contribute to your overall design.
Design Calculators 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

AD621 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD621ANZ Status: Production 8 ld PDIP 8 Ind Tube, 50 $5.37 $4.56 Y  Material Info PCN Purchase
AD621AR Status: Production 8 ld SOIC 8 Ind Tube, 98 $5.78 $4.89 N  Material Info PCN Purchase
AD621AR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 750 - $4.89 N  Material Info PCN Purchase
AD621ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $5.11 $4.34 Y  Material Info PCN Purchase
AD621ARZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $4.34 Y  Material Info PCN Purchase
AD621ARZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $4.34 Y  Material Info PCN Purchase
AD621BNZ Status: Production 8 ld PDIP 8 Ind Tube, 50 $8.05 $6.85 Y  Material Info PCN Purchase
AD621BR Status: Production 8 ld SOIC 8 Ind Tube, 98 $8.66 $7.36 N  Material Info PCN Purchase
AD621BR-REEL Status: Last Time Buy 8 ld SOIC 8 Ind Reel, 2500 - $7.36 N  Material Info PCN/PDN Purchase
AD621BR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $7.36 N  Material Info PCN Purchase
AD621BRZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $7.67 $6.52 Y  Material Info PCN Purchase
AD621BRZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $6.52 Y  Material Info PCN Purchase
AD621BRZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $6.52 Y  Material Info PCN Purchase
AD621SQ/883B Status: Production 8 ld CerDIP 8 Mil Tube, 48 $30.50 $27.46 N  Material Info PCN 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.

AD62x, AD822x, AD842x Series InAmp Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-INAMP-62RZ Status: Production AD620/621/AD622/623/627/AD8223 SOIC Eval Board $40.23 Yes -
EVAL-INAMP-ICF-RMZ Status: Production AD8420/AD8237 MSOP Eval Board $34.58 Yes -
EVAL-INAMP-82RMZ Status: Production AD8220/8221/8226/8227/8228/8236/8421/8422 MSOP Eval Board $34.49 Yes -
EVAL-INAMP-82RZ Status: Production AD8221/8226/8227/8228/8229/8421/8422/8428/8429 SOIC Eval Board $34.49 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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