AD8429

1 nV/√Hz Low Noise Instrumentation Amplifier
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Product Details

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

Product Lifecycle

checked Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits

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Product Details

Analog Devices provides a line of evaluation boards designed to help users evaluate our instrumentation amplifiers in 8 pin packages. Access the user guide UG-261.


This user guide describes three generic evaluation boards that can be used to evaluate many of Analog Devices instrumentation amplifiers. For information on the performance of a specific instrumentation amplifier, see the data sheet for that instrumentation amplifier.


  • 3 generic, easy-to-use evaluation boards
  • Shipped with an assortment of Analog Devices, Inc., in-amps
  • Solder in the in-amp to be tested
  • Test pins already populated
  • Decoupling capacitors already populated
  • EVAL-INAMP-62RZ board: Compatible with AD620, AD621, AD622, AD623, AD627, AD8223, and AD8225 in SOIC or PDIP
  • EVAL-INAMP-82RZ board: Compatible with AD8221, AD8226, AD8227, AD8228, AD8229, AD8421, AD8422, AD8428, and AD8429 in SOIC package
  • EVAL-INAMP-82RMZ board: Compatible with AD8220, AD8221, AD8226, AD8227, AD8228, AD8236, AD8421, and AD8422 in MSOP package

Tools & Simulations

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SPICE Models

Design Resources

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

AD8429 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

Reviews

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Overview

5 Reviews
5 out of 5 (100%) customers recommend this product.
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Most Helpful Review

by Anonymous
It would be nice if gain setting resistors can use more common values, like 100R instead of 60.4R for gain = 100, for example.

Most Recent Review

by Joel
It would be really interesting to have an instrumentation amplifire with a high GBP.

All Reviews

by Joel, 11 Nov 14
More GBP
It would be really interesting to have an instrumentation amplifire with a high GBP.
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by pal, 5 May 14
Flexible instrumentation amplifiers
To my knowledge the AD8429 is the first ultra low-noise instrumentation amplifier easy to use, with no problem of stability. The only "weak" point is the large bias current. The pinout is the same as the one the AD8421 which is better for medium to high source impedance. The same design can thus be adapted to the impedance of the signal to measure.
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by tmxeon, 17 Apr 14
good products
The products can perfectly match the datasheet. Currently they are working well.
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by derek, 15 Jan 14
any chance of a dual amp on one die?
Great amp, using it for RF semiconductor characterisation. Any chance of a dual version (Differential IQ)
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by Anonymous, 4 Feb 13
Excellent device. Bspec somewhat expensive. Otherwise no complaint at all.
It would be nice if gain setting resistors can use more common values, like 100R instead of 60.4R for gain = 100, for example.
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Sample & Buy

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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.


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Evaluation Boards Pricing displayed is based on 1-piece.
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.