AD8422:  High Performance, Low Power, Rail-to-Rail Precision Instrumentation Amplifier

Product Details

Product Status:Recommended for New Designs

The AD8422 is a high precision, low power, low noise, rail-to-rail instrumentation amplifier that delivers the best performance per unit microampere in the industry. The AD8422 processes signals with ultralow distortion performance that is load independent over its full output range.

The AD8422 is the third generation development of the industry standard AD620. The AD8422 employs new process technologies and design techniques to achieve higher dynamic range and lower errors than its predecessors, while consuming less than one-third of the power. The AD8422 uses the high performance pinout introduced by the AD8221.

Very low bias current makes the AD8422 error-free with high source impedance, allowing multiple sensors to be multiplexed to the inputs. Low voltage noise and low current noise make the AD8422 an ideal choice for measuring a Wheatstone bridge.

The wide input range and rail-to-rail output of the AD8422 bring all of the benefits of a high performance in-amp to singlesupply applications. Whether using high or low supply voltages, the power savings make the AD8422 an excellent choice for high channel count or power sensitive applications on a very tight error budget.

The AD8422 uses robust input protection that ensures reliability without sacrificing noise performance. The AD8422 has high ESD immunity, and the inputs are protected from continuous voltages up to 40 V from the opposite supply rail.

A single resistor sets the gain from 1 to 1000. The reference pin can be used to apply a precise offset to the output voltage. The AD8422 is specified from −40°C to +85°C and has typical performance curves to 125°C. It is available in 8-lead MSOP and 8-lead SOIC packages.

APPLICATIONS

  • Medical instrumentation
  • Industrial process controls
  • Strain gages
  • Transducer interfaces
  • Precision data acquisition systems
  • Channel-isolated systems
  • Portable instrumentation

FEATURES and BENEFITS

  • Low power:
    -- 330 μA maximum quiescent current
  • Rail-to-rail output
  • Low noise and distortion
    -- 8 nV/√Hz maximum input voltage noise at 1 kHz
    -- 0.15 μV p-p RTI noise (G = 100)
    -- 0.5 ppm nonlinearity with 2 kΩ load (G = 1)
  • Excellent ac specifications
    -- 80 dB minimum CMRR at 7 kHz (G = 1)
    -- 2.2 MHz bandwidth (G = 1)
  • High precision dc performance (AD8422BRZ)
    -- 150 dB minimum CMRR
    (G = 1000)
    -- 0.04% maximum gain error
    (G = 1000)
    -- 0.3 μV/°C maximum input offset drift
    -- 0.5 nA maximum input bias current
  • Wide supply range
    -- 3.6 V to 36 V single supply
    -- ±1.8 V to ±18 V dual supply
  • Input overvoltage protection:
    40 V from opposite supply
  • Gain range: 1 to 1000

Pin Configuration Diagram for AD8422

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8422 SPICE Macro Model SPICE Models HTML

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Price, packaging, availability

AD8422 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8422ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $2.50 $2.10 Y  Material Info Notify Me Purchase Sample
AD8422ARMZ-R7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $2.10 Y  Material Info Notify Me Purchase
AD8422ARMZ-RL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $2.10 Y  Material Info Notify Me Purchase
AD8422ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $2.80 $2.35 Y  Material Info Notify Me Purchase Sample
AD8422ARZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $2.35 Y  Material Info Notify Me Purchase
AD8422ARZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.35 Y  Material Info Notify Me Purchase
AD8422BRMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $4.15 $3.49 Y  Material Info Notify Me Purchase Sample
AD8422BRMZ-R7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $3.49 Y  Material Info Notify Me Purchase
AD8422BRMZ-RL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $3.49 Y  Material Info Notify Me Purchase
AD8422BRZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $4.64 $3.90 Y  Material Info Notify Me Purchase Sample
AD8422BRZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $3.90 Y  Material Info Notify Me Purchase
AD8422BRZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $3.90 Y  Material Info Notify Me 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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