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AD8220:  JFET Input Instrumentation Amplifier with Rail-to-Rail Output

Product Details

Product Status:Recommended for New Designs

The AD8220 is the first single-supply, JFET input instrumentation amplifier available in an MSOP package. Designed to meet the needs of high performance, portable instrumentation, the AD8220 has a minimum common-mode rejection ratio (CMRR) of 86 dB at dc and a minimum CMRR of 80 dB at 5 kHz for G = 1. Maximum input bias current is 10 pA and typically remains below 300 pA over the entire industrial temperature range. Despite the JFET inputs, the AD8220 typically has a noise corner of only 10 Hz.

With the proliferation of mixed-signal processing, the number of power supplies required in each system has grown. The AD8220 is designed to alleviate this problem. The AD8220 can operate on a ±18 V dual supply, as well as on a single +5 V supply. Its rail-to-rail output stage maximizes dynamic range on the low voltage supplies common in portable applications. Its ability to run on a single 5 V supply eliminates the need to use higher voltage, dual supplies. The AD8220 draws a maximum of 750 μA of quiescent current, making it ideal for battery powered devices.

Gain is set from 1 to 1000 with a single resistor. Increasing the gain increases the common-mode rejection. Measurements that need higher CMRR when reading small signals benefit when the AD8220 is set for large gains.

A reference pin allows the user to offset the output voltage. This feature is useful when interfacing with analog-to-digital converters.

The AD8220 is available in an MSOP that takes roughly half the board area of an SOIC. Performance for the A and B grade is specified over the industrial temperature range of −40°C to +85°C, and the W grade is specified over the automotive temperature range of −40°C to +125°C.

Applications

  • Medical instrumentation
  • Precision data acquisition
  • Transducer interfaces

FEATURES and BENEFITS

  • High CMRR
    100 dB CMRR min, G = 10 (B grade)
    80 dB CMRR min to 5 kHz,
    G = 1 (B Grade)
  • Excellent ac specifications and low power
    1.5 MHz bandwidth (G = 1)
    14 nV/√Hz input noise (1 kHz)
    Slew rate: 2 V/μs
    750 μA quiescent supply current max
  • Qualified for Automotive Applications
  • Low input currents
    10 pA max input bias current (B grade)
    0.6 pA max input offset current (B grade)
  • Versatile
    MSOP package
    Rail-to-rail output
    Input voltage range to below negative supply rail
    4 kV ESD protection
    4.5 V to 36 V single supply
    ±2.25 V to ±18 V dual supply
    Gain set with single resistor (G = 1 to 1000)

Pin Configuration for AD8220

Documentation

Title Content Type File Type
AD8220: JFET Input Instrumentation Amplifier with Rail-to-Rail Output in MSOP Package Data Sheet  (Rev B, 05/2010) (pdf, 803 kB) Data Sheets 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
CN-0067: Fully Isolated Input Module Based on the AD7793 24-Bit Σ-Δ ADC, the ADuM5401 Digital Isolator, and a High Performance In-Amp  (pdf, 271 kB) Circuit Note PDF
Biopotential Electrode Sensors in ECG/EEG/EMG Systems  (pdf, 122 kB) White Papers 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
UG-181: PLC Demo System User Guide  (pdf, 541 kB) User Guides PDF
MS-2160: Mitigation Strategies for ECG Design Challenges  (pdf, 205 kB) Technical Articles PDF
Biopotential Electrode Sensors in ECG/EEG/EMG Systems  (pdf, 122 kB) Technical Articles 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
Simplifying Design of Industrial Process-Control Systems with PLC Evaluation Boards
PLC evaluation board applications for industrial process-control systems are diverse, ranging from simple traffic control to complex electrical power grids, from environmental control systems to oil-refinery process control.
(Industrial Control DesignLine, 8/24/09 - Part 1 and 9/3/09 - Part 1)
Technical Articles HTML
Simplifying Design of Industrial Process-Control Systems with PLC Evaluation Boards (Part 1 of 2)
PLC evaluation board applications for industrial process-control systems are diverse, ranging from simple traffic control to complex electrical power grids, from environmental control systems to oil-refinery process control.
(Industrial Control DesignLine, 8/24/09)
Technical Articles HTML
High-performance Adder Uses Instrumentation Amplifiers
Make an adder circuit using instrumentation amplifiers to increase input impedance.
(EDN, 9/3/2009)
Technical Articles HTML
PLC Evaluation Board Simplifies Design of Industrial Process Control Systems
(Analog Dialogue, Vol. 43, April 2009)
Technical Articles HTML
High Performance Electrocardiogram (ECG) Signal Conditioning Technical Articles HTML
Biopotential Electrode Sensing in ECG, EMG, and EEG Monitors Technical Articles HTML
PLC Evaluation Board Simplifies Design of Industrial Process Control Systems
(Analog Dialogue, Vol. 43, April 2009)
Analog Dialogue HTML
Biopotential Electrode Sensors in ECG/EEG/EMG Systems  (pdf, 122 kB) Technical Documentation PDF
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
Medical Applications Overview HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8220 SPICE Macro-Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

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

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Price, packaging, availability

AD8220 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8220ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $2.82 $2.32 Y  Material Info PCN Purchase Sample
AD8220ARMZ-R7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $2.32 Y  Material Info PCN Purchase
AD8220ARMZ-RL Status: Last Time Buy 8 ld MSOP 8 Ind Reel, 3000 - $2.32 Y  Material Info PCN/PDN Purchase
AD8220BRMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $4.31 $3.53 Y  Material Info PCN Purchase Sample
AD8220BRMZ-R7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $3.53 Y  Material Info PCN Purchase
AD8220BRMZ-RL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $3.53 Y  Material Info PCN Purchase
AD8220WARMZ Status: Production 8 ld MSOP 8 Auto Tube, 50 $3.53 $2.90 Y  Material Info PCN Purchase
AD8220WARMZ-R7 Status: Production 8 ld MSOP 8 Auto Reel, 1000 $3.53 $2.90 Y  Material Info Notify Me Purchase
AD8220WARMZ-RL Status: Production 8 ld MSOP 8 Auto Reel, 3000 - $2.90 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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