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AD8429:  1 nV/√Hz Low Noise Instrumentation Amplifier

Product Details

Product Status:Recommended for New Designs

The AD8429 is an ultralow noise, instrumentation amplifier designed for measuring extremely small signals over a wide temperature range (−40°C to +125°C).

The AD8429 excels at measuring tiny signals. It delivers ultralow input noise performance of 1 nV/√Hz. The high CMRR of the AD8429 prevents unwanted signals from corrupting the acqui-sition. The CMRR increases as the gain increases, offering high rejection when it is most needed. The high performance pin configuration of the AD8429 allows it to reliably maintain high CMRR at frequencies well beyond those of typical instrumentation amplifiers.

The AD8429 reliably amplifies fast changing signals. Its current feedback architecture provides high bandwidth at high gain, for example, 1.2 MHz at G = 100. The design includes circuitry to im-prove settling time after large input voltage transients. The AD8429 was designed for excellent distortion performance, allowing use in demanding applications such as vibration analysis.

Gain is set from 1 to 10,000 with a single resistor. A reference pin allows the user to offset the output voltage. This feature can be useful to shift the output level when interfacing to a single supply signal chain. The AD8429 performance is specified over the extended industrial temperature range of −40°C to +125°C. It is available in an 8-lead plastic SOIC package.

APPLICATIONS

  • Medical instrumentation
  • Precision data acquisition
  • Microphone preamplification
  • Vibration analysis

FEATURES and BENEFITS

  • Low noise
    -- 1 nV/√Hz input noise
    -- 45 nV/√Hz output noise
  • High accuracy dc performance (AD8429BRZ)
    -- 90 dB CMRR minimum (G = 1)
    -- 50 μV maximum input offset voltage
    -- 0.02% maximum gain accuracy (G = 1)
  • Excellent ac specifications
    -- 80 dB CMRR to 5 kHz (G = 1)
    -- 15 MHz bandwidth (G = 1)
    -- 1.2 MHz bandwidth (G = 100)
    -- 22 V/μs slew rate
    -- THD: −130 dBc (1 kHz, G = 1)
  • Versatile
    ±4 V to ±18 V dual supply
    Gain set with a single resistor
    (G = 1 to 10,000)
  • Temperature range for specified performance
    −40°C to +125°C

Pin Configuration Diagram for AD8429

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8429 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

AD8429 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8429ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $4.13 $3.50 Y  Material Info Notify Me Purchase Sample
AD8429ARZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 $4.13 $3.50 Y  Material Info Notify Me Purchase
AD8429BRZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $6.89 $5.85 Y  Material Info Notify Me Purchase
AD8429BRZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 $6.89 $5.85 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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