DESCRIPTION

· The AS3500/01/02 are low-power speaker drivers with Ambient Noise Cancelling (ANC) functionality, designed for handsets, headphones, and earpieces.
· They enhance audio quality by reducing background noise during music playback or phone conversations.
· Fully analog implementation ensures low power consumption, cost efficiency, and natural voice enhancement.
· Supports feed-forward and feedback topologies for effective noise reduction across various frequency ranges.
· Features an internal OTP-ROM for microphone gain calibration and flexible configurations for different mechanical designs.
· Can drive high-impedance headsets in bridged mode.

FEATURES

· Microphone Input: 128 gain steps, differential low-noise amplifier, electret microphone supply, and OTP-programmable gain.
· High Efficiency Headphone Amplifier: 2x34mW output, bridged mode for high-impedance loads, and click/pop-free operation.
· Line Input: Volume control via serial interface or pin, 64 steps with mute, and pop-free gain setting.
· ANC Processing: Feed-forward and feedback cancellation, configurable filter loop, and 12-30dB noise reduction.
· Monitor Function: Ambient sound amplification and volume control for assisted hearing.
· Performance: Low power consumption (5/3.8mA), extended PSRR, and single-cell or fixed voltage supply.
· Package: QFN24 (4x4mm) for AS3500/01 and QFN32 (5x5mm) for AS3502.

APPLICATIONS

· Ear pieces, headsets, and hands-free kits.
· Mobile phones and voice communication devices.