DESCRIPTION

· The AS3421/22 are low power ambient noise-cancelling speaker drivers designed for headsets, headphones, or earpieces.
· They enhance audio quality by reducing background noise, suitable for music listening and phone conversations.
· The devices feature a fully analog implementation for low power consumption and cost efficiency.
· They support various configurations for optimal noise cancellation and filtering.
· Includes an audio playback mode and automatic power-saving features when ANC is off.

FEATURES

· Microphone input with 128 gain steps and AGC.
· High efficiency headphone amplifier with 2x23mW output.
· Line input with volume control via serial interface or push buttons.
· ANC processing with feed-forward and feedback cancellation.
· Monitor function for assisted hearing and ambient sound amplification.
· Performance parameters include 7mA current at 1.5V and less than 1µA quiescent current.
· Interfaces include 2-wire serial control and calibration options.

APPLICATIONS

· Ideal for wireless devices such as stereo Bluetooth headsets and stereo wireless headsets.