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AD8224:  Precision, Dual-Channel, JFET Input, Rail-to-Rail Instrumentation Amplifier

Product Details

Product Status:Recommended for New Designs

The AD8224 is the first single-supply, JFET input instrumentation amplifier available in the space-saving 16-lead, 4 mm × 4 mm LFCSP. It requires the same board area as a typical single instrumentation amplifier yet doubles the channel density and offers a lower cost per channel without compromising performance.

Designed to meet needs of high performance, portable instrumentation, the AD8224 has a minimum common-mode rejection ratio (CMRR) of 86 dB at dc and a minimum CMRR of 80 dB at 10 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 AD8224 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.

Designed to alleviate this problem, the AD8224 can operate on a ±18 V dual supply, as well as on a single +5 V supply. The device’s 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 for higher voltage, dual supplies. The AD8224 draws 750 μA of quiescent current per amplifier, making it ideal for battery powered devices.

In addition, the AD8224 can be configured as a single-channel, differential output, instrumentation amplifier. Differential outputs provide high noise immunity, which can be useful when the output signal must travel through a noisy environment, such as with remote sensors. The configuration can also be used to drive differential input ADCs.

For a single-channel version, use the AD8220.

Applications

  • Medical instrumentation
  • Precision data acquisition
  • Transducer interfaces
  • Differential drives for high resolution input ADCs
  • Remote sensors

FEATURES and BENEFITS

  • Custom LFCSP package with hidden paddle
    • Permits routing and vias underneath package
    • Allows full bias current performance
  • Low input currents
    • 10 pA max input bias current (B Grade)
    • 0.6 pA max input offset current (B Grade)
  • 100 dB CMRR min,
    G = 10 (B Grade)
    90 dB CMRR min to
    10 kHz, G = 10 (B Grade)
  • Two channels in a small
    4 mm × 4 mm LFCSP
  • 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 current per amplifier
  • Versatility
    See the AD8224 data sheet for details

Functional Block Diagram for AD8224

OF NOTE

Technical Articles:

Documentation

Title Content Type File Type
AD8224: Precision, Dual-Channel, JFET Input, Rail-to-Rail Instrumentation Amplifier Data Sheet (Rev C, 12/2013) (pdf, 884 kB) Data Sheets 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
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
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 Cost, Low Power, High Performance AED Technical Articles HTML
Biopotential Electrode Sensing in ECG, EMG, and EEG Monitors Technical Articles HTML
Biopotential Electrode Sensors in ECG/EEG/EMG Systems  (pdf, 122 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
AD8224 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

AD8224 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8224ACPZ-R7 Status: Production 16 ld LFCSP (4x4mm, 2.50mm exposed pad) 16 Ind Reel, 1500 - $4.17 Y  Material Info PCN Purchase Sample
AD8224ACPZ-RL Status: Production 16 ld LFCSP (4x4mm, 2.50mm exposed pad) 16 Ind Reel, 5000 - $4.17 Y  Material Info PCN Purchase
AD8224ACPZ-WP Status: Production 16 ld LFCSP (4x4mm, 2.50mm exposed pad) 16 Ind Tray, 64 $5.00 $4.17 Y  Material Info PCN Purchase
AD8224BCPZ-R7 Status: Production 16 ld LFCSP (4x4mm, 2.50mm exposed pad) 16 Ind Reel, 1500 - $6.77 Y  Material Info PCN Purchase
AD8224BCPZ-RL Status: Production 16 ld LFCSP (4x4mm, 2.50mm exposed pad) 16 Ind Reel, 5000 - $6.77 Y  Material Info PCN Purchase
AD8224BCPZ-WP Status: Production 16 ld LFCSP (4x4mm, 2.50mm exposed pad) 16 Ind Tray, 64 $8.13 $6.77 Y  Material Info PCN Purchase
AD8224HACPZ-R7 Status: Production 16 ld LFCSP (4x4x.85mm, no exposed pad) 16 Ind Reel, 1500 $5.10 $4.27 Y  Material Info Notify Me Purchase
AD8224HACPZ-RL Status: Production 16 ld LFCSP (4x4x.85mm, no exposed pad) 16 Ind Reel, 5000 $5.10 $4.27 Y  Material Info Notify Me Purchase
AD8224HACPZ-WP Status: Production 16 ld LFCSP (4x4x.85mm, no exposed pad) 16 Ind Tray, 64 $5.10 $4.27 Y  Material Info PCN Purchase
AD8224HBCPZ-R7 Status: Production 16 ld LFCSP (4x4x.85mm, no exposed pad) 16 Ind Reel, 1500 - $6.87 Y  Material Info PCN Purchase
AD8224HBCPZ-RL Status: Production 16 ld LFCSP (4x4x.85mm, no exposed pad) 16 Ind Reel, 5000 - $6.87 Y  Material Info PCN Purchase
AD8224HBCPZ-WP Status: Production 16 ld LFCSP (4x4x.85mm, no exposed pad) 16 Ind Tray, 64 $8.23 $6.87 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.

AD8224 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8224-EVALZ Status: Production Evaluation Board $70.79 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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