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AD8420:  Wide Supply Range, Micropower, Rail-to-Rail Instrumentation Amplifier

Product Details

Product Status:Recommended for New Designs

The AD8420 is a low cost, micropower, wide supply range, instrumentation amplifier with a rail-to-rail output and a novel architecture that allows for extremely flexible design. It is optimized to amplify small differential voltages in the presence of large common-mode signals.

The AD8420 is based on an indirect current feedback architecture that gives it an excellent input common-mode range. Unlike conventional instrumentation amplifiers, the AD8420 can easily amplify signals at or even slightly below ground without requiring dual supplies. The AD8420 has rail-to-rail output, and the output voltage swing is completely independent of the input common-mode voltage.

Single-supply operation, micropower current consumption, and rail-to-rail output swing make the AD8420 ideal for battery-powered applications. Its rail-to-rail output stage maximizes dynamic range when operating from low supply voltages. Dual-supply operation (±15 V) and low power consumption make the AD8420 ideal for a wide variety of applications in medical or industrial instrumentation.

The AD8420 is available in an 8-lead MSOP package. Performance is specified over the full temperature range of −40°C to +85°C, and the part is operational from −40°C to +125°C

APPLICATIONS
  • Bridge amplifiers
  • Pressure Measurement
  • Medical instrumentation
  • Portable data acquisition
  • Multichannel systems

FEATURES and BENEFITS

  • Maximum supply current:
    80 μA
  • Minimum CMRR: 100 dB
  • Drives heavy capacitive loads: ~700 pF
  • Rail-to-rail output
  • Input voltage range goes below ground
  • Gain set with 2 external resistors
    - Can achieve low gain drift at any gain
  • Very wide power supply range
    - Single supply: 2.7 V to 36 V
    - Dual supply:±2.7 V to ±18 V
  • Bandwidth (G = 100):
    2.5 kHz
  • Input voltage noise:
    55 nV/√Hz
  • See data sheet for additional features

Pin Configuration Diagram for AD8420

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8420 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.

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Price, packaging, availability

AD8420 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8420ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $1.11 $0.89 Y  Material Info PCN Purchase Sample
AD8420ARMZ-R7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 $1.11 $0.89 Y  Material Info PCN Purchase
AD8420ARMZ-RL Status: Production 8 ld MSOP 8 Ind Reel, 3000 $1.11 $0.89 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.

AD8237 and AD8420 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-INAMP-ICF-RMZ Status: Production Evaluation Board for AD8420 and 8237 $34.58 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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