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AD8421:  3 nV /√Hz, Low Power Instrumentation Amplifier

Product Details

Product Status:Recommended for New Designs

The AD8421 is a low cost, low power, extremely low noise, ultra-low bias current, high speed instrumentation amplifier which is ideally suited for a broad spectrum of signal conditioning and data acquisition applications. This breakthrough product features the highest CMRR available, allowing it to extract low-level signals in the presence of high-frequency common mode noise over a wide temperature range.

The 10 MHz bandwidth, 35 V/µs slew rate, and 0.7 µs settling time to 0.01% (G = 1) allow the AD8421 to amplify high-speed signals and excel in applications that require high channel-count multiplexed systems. Even at high gain, the current feedback architecture preserves this performance, for example, at G = 100, the bandwidth is 2 MHz and the settling time is 0.6 µs. The AD8421 has excellent distortion performance, allowing use in demanding applications such as vibration analysis.

The AD8421 delivers industry-leading 3 nV/√Hz input voltage noise and 200 fA/√Hz current noise with only 2 mA quiescent current, making it an ideal choice for measuring low-level signals. For applications with significant source impedance, the AD8421 employs novel process technology and innovative design techniques to provide groundbreaking noise performance limited only by the sensor.

The AD8421 uses a unique input protection method to give it robust inputs while still maintaining very low noise. This input protection allows voltages 40 V from the opposite supply rail without damage.

A single resistor sets gains between 1 and 10,000. The reference pin can be used to apply a precise offset to the output voltage.

The AD8421 performance is specified from −40°C to +85°C and has typical performance curves to 125°C. It is available in MSOP and SOIC packages.

APPLICATIONS

  • Medical instrumentation
  • Precision data acquisition
  • Microphone preamplification
  • Vibration analysis
  • Multiplexed input applications
  • ADC driver

FEATURES and BENEFITS

  • Low power
    -- 2.3 mA maximum supply current
  • Low noise
    -- 3.2 nV/√Hz maximum input voltage noise at 1 kHz -- 200 fA/√Hz current noise at 1 kHz
  • Excellent ac specifications
    -- 10 MHz bandwidth (G = 1)
    -- 2 MHz bandwidth (G = 100)
    -- 0.6 µs settling time to 0.001% (G = 10)
    -- 80 dB CMRR to 20 kHz
    (G = 1)
    -- 35 V/µs slew rate
  • High precision dc performance (AD8421BRZ)
    -- 94 dB CMRR minimum
    (G = 1)
    -- 0.2 µV/°C maximum input offset voltage drift
    -- 1 ppm/°C maximum gain drift (G = 1)
    -- 500 pA maximum input bias current
  • See data sheet for additional features

AD8421-EP Supports defense and aerospace applications (AQEC standard)

  • Download AD8421-EP Data Sheet (pdf)
  • Military temperature range
    (−55°C to +125°C)
  • Controlled manufacturing baseline
  • One assembly/test site
  • One fabrication site
  • Enhanced product change notification
  • Qualification data available on request
  • V62/13625 DSCC Drawing Number

Pin Configuration Diagram for AD8421

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8421 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

AD8421 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8421ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $2.80 $2.35 Y  Material Info Notify Me Purchase Sample
AD8421ARMZ-R7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 $2.80 $2.35 Y  Material Info Notify Me Purchase
AD8421ARMZ-RL Status: Production 8 ld MSOP 8 Ind Reel, 3000 $2.80 $2.35 Y  Material Info Notify Me Purchase
AD8421ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $3.37 $2.83 Y  Material Info Notify Me Purchase Sample
AD8421ARZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $2.83 Y  Material Info Notify Me Purchase
AD8421ARZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.83 Y  Material Info Notify Me Purchase
AD8421BRMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $5.12 $4.31 Y  Material Info Notify Me Purchase Sample
AD8421BRMZ-R7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 $5.12 $4.31 Y  Material Info Notify Me Purchase
AD8421BRMZ-RL Status: Production 8 ld MSOP 8 Ind Reel, 3000 $5.12 $4.31 Y  Material Info Notify Me Purchase
AD8421BRZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $5.59 $4.70 Y  Material Info Notify Me Purchase Sample
AD8421BRZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $4.70 Y  Material Info Notify Me Purchase
AD8421BRZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $4.70 Y  Material Info Notify Me Purchase
AD8421TRMZ-EP Status: Production 8 ld MSOP 8 Mil Tube, 50 $8.43 $7.08 Y  Material Info Notify Me Purchase
AD8421TRMZ-EP-R7 Status: Production 8 ld MSOP 8 Mil Reel, 1000 - $7.08 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.

AD8421 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-INAMP-62RZ Status: Production Evaluation Board $40.23 Yes -
EVAL-INAMP-82RMZ Status: Production Evaluation Board $34.49 Yes -
EVAL-INAMP-82RZ Status: Production Evaluation Board $34.49 Yes -
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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