AS3421 Active Noise Cancellation

Low power ambient noise cancellation speaker driver


  • >25dB noise reduction achievable
  • High quality audio chain
  • Fully electronic calibration
  • Differential line inputs
  • 1.0V - 1.8V supply


  • Superior performance
  • Pure, unadulterated audio
  • No manual intervention during production
  • Seamless connection to BT SoC's
  • Optimised system efficiency

Product parameters

Function Receive path
Topology Feedforward
Output Type Stereo SE
Max. Output Power 34mW@16 Ohm load; 24mW@32 Ohm load
SNR, THD >100dB, <0.1% (SE, 34mW, 16 Ohm)
ANC Performance >25dB
Supply Voltage 1.0V to 1.8V
Package QFN-24 (4x4)

General Description

Analog ANC solution

Integrated active noise cancellation solution addressing feedforward architecture for stereo wireless headsets, suitable for music, video or mobile use.

Not Recommended for New Designs
ams AG does not recommend using AS3421 for new designs. Final lifetime buy order must be placed by April 30, 2020.
Please see AS3435 for possible replacement.

This product suits for the following applications:

  • Stereo Bluetooth headsets
  • Stereo wireless headsets


Title Category Headline Buy
AS3421EvalKit Application Board Evaluation Kit for AS3421

Technical Documents

Type Description Language
Datasheet Document version 1.10 English

Environmental Documents

Type Description Language
Material Declaration Form MDF_188720012_AS3421-EQFP English


Type Description Language
EoL Notification AS3421 (issued 2019-Oct) English

Other Information

Type Description Language
Factsheet Stereo Bluetooth ANC Headphone Speaker Driver English

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