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AD8221:  Precision Instrumentation Amplifier

Product Details


Newer Alternatives:
  • Looking for a high performance in-amp with lower noise, wider bandwidth, and fast settling time? Consider the AD8421.
  • Looking for a high performance in-amp with lower power and a rail-to-rail output? Consider the AD8422.

The AD8221 is a gain programmable, high performance instrumentation amplifier that delivers the industry’s highest CMRR over frequency in its class. The CMRR of instrumentation amplifiers on the market today falls off at 200 Hz. In contrast, the AD8221 maintains a minimum CMRR of 80 dB to 10 kHz for all grades at G = 1. High CMRR over frequency allows the AD8221 to reject wideband interference and line harmonics, greatly simplifying filter requirements. Possible applications include precision data acquisition, biomedical analysis, and aerospace instrumentation.

Low voltage offset, low offset drift, low gain drift, high gain accuracy, and high CMRR make this part an excellent choice in applications that demand the best dc performance possible, such as bridge signal conditioning.

Programmable gain affords the user design flexibility. A single resistor sets the gain from 1 to 1000. The AD8221 operates on both single and dual supplies and is well suited for applications where ±10 V input voltages are encountered.

The AD8221 is available in a low cost 8-lead SOIC and 8-lead MSOP, both of which offer the industry’s best performance. The MSOP requires half the board space of the SOIC, making it ideal for multichannel or space-constrained applications.

Performance is specified over the entire industrial temperature range of −40°C to +85°C for all grades. Furthermore, the AD8221 is operational from −40°C to +125°C*.

Applications

  • Weigh scales
  • Industrial process controls
  • Bridge amplifiers
  • Precision data acquisition systems
  • Medical instrumentation
  • Strain gages
  • Transducer interfaces

FEATURES and BENEFITS

  • Chinese data sheet available
  • Available in space-saving MSOP
  • Gain set with 1 external resistor (gain range 1 to 1000)
  • Operational up to 125°C*
  • Wide power supply range: ±2.3 V to ±18 V
  • Excellent AC specifications
    80 dB minimum CMRR to 10 kHz ( G = 1)
    825 kHz, –3 dB bandwidth (G = 1)
    2 V/μs slew rate

* See Typical Performance Characteristics for expected operation from 85°C to 125°C.

  • Temperature range for specified performance: −40°C to +85°C
  • Low noise
    8 nV/√Hz, @ 1 kHz, maximum input voltage noise
    0.25 μV p-p input noise (0.1 Hz to 10 Hz)
  • High accuracy dc performance (AD8221BR)
    90 dB minimum CMRR (G = 1)
    25 μV maximum input offset voltage
    0.3 μV/°C maximum input offset drift
    0.4 nA maximum input bias current

Connection Diagram for AD8221

Documentation

Title Content Type File Type
AD8221: Precision Instrumentation Amplifier Data Sheet  (Rev C, 03/2011) (pdf, 701 kB) Data Sheets PDF
AN-282: Fundamentals of Sampled Data Systems  (pdf, 2131 kB) Application Notes PDF
AN-671: Reducing RFI Rectification Errors in In-Amp Circuits  (pdf, 208 kB) Application Notes PDF
AN-683: Strain Gage Measurement Using an AC Excitation  (pdf, 122 kB) Application Notes PDF
CN-0114: Low Cost, High Voltage, Programmable Gain Instrumentation Amplifier Using the AD5292 Digital Potentiometer and the AD8221 In-Amp  (pdf, 155 kB) Circuit Note 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
MS-2178: Discussion Between CareFusion and Analog Devices: Optimizing Performance and Lowering Power in an EEG Amplifer  (pdf, 147 kB) Technical Articles PDF
MS-2160: Mitigation Strategies for ECG Design Challenges  (pdf, 205 kB) Technical Articles PDF
Eye Movement Controls Gaming Console
(EE Times, 11/4/2010)
Technical Articles HTML
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
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
Applying Instrumentation Amplifiers Effectively: The Importance of an Input Ground Return  (pdf, 508 kB) Technical Documentation PDF
analogZONE Reviews the AD8221  (htm)
(February 10, 2003)
Product Reviews HTM
Dual In-Amp And Signal Isolators Sweat The Small Stuff
(ED, 4/13/2006)
Product Reviews HTML
DigiPot Circuits from the Lab Overview HTML
Optimum process control means efficiency, reliability, and Analog ICs. Overview HTML
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
AD8221 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

AD8221 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8221AC-P7 Status: Production CHIPS OR DIE 0 Ind Reel, 5000 - - Y  Material Info Notify Me Contact ADI
AD8221AR Status: Production 8 ld SOIC 8 Ind Tube, 98 $3.36 $2.85 N  Material Info PCN Purchase
AD8221AR-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 $3.36 $2.85 N  Material Info PCN Purchase
AD8221AR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 $3.36 $2.85 N  Material Info PCN/PDN Purchase
AD8221ARM Status: Production 8 ld MSOP 8 Ind Tube, 50 $2.89 $2.45 N  Material Info PCN Purchase
AD8221ARM-REEL Status: Production 8 ld MSOP 8 Ind Reel, 3000 $2.89 $2.45 N  Material Info PCN/PDN Purchase
AD8221ARM-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 $2.89 $2.45 N  Material Info PCN Purchase
AD8221ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $2.38 $2.01 Y  Material Info PCN Purchase Sample
AD8221ARMZ-R7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 $2.38 $2.01 Y  Material Info PCN Purchase
AD8221ARMZ-RL Status: Production 8 ld MSOP 8 Ind Reel, 3000 $2.38 $2.01 Y  Material Info PCN Purchase
AD8221ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $2.77 $2.35 Y  Material Info PCN Purchase Sample
AD8221ARZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 $2.77 $2.35 Y  Material Info PCN Purchase
AD8221ARZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 $2.77 $2.35 Y  Material Info PCN Purchase
AD8221BR Status: Production 8 ld SOIC 8 Ind Tube, 98 $5.34 $4.54 N  Material Info PCN Purchase
AD8221BR-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 $5.34 $4.54 N  Material Info PCN/PDN Purchase
AD8221BR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 $5.34 $4.54 N  Material Info PCN Purchase
AD8221BRZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $4.60 $3.90 Y  Material Info PCN Purchase Sample
AD8221BRZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $3.90 Y  Material Info PCN Purchase
AD8221BRZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $3.90 Y  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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