AS3501-EQFP-500

Overview

The AS3501-EQFP-500 is a low-power ambient noise-cancelling speaker driver designed for handsets, headphones, and ear pieces. It features a fully analog implementation to minimize power consumption and system BOM cost while enhancing received voice quality by reducing background ambient noise. The device supports feed-forward topology for effective low-frequency noise reduction and includes an internal OTP-ROM for storing microphone gain calibration settings. It operates with a single cell or fixed 1.0V to 1.8V supply using an internal charge pump.

Feature Summary

• Fully analog ambient noise cancellation architecture for lowest power consumption
• Feed-forward topology for effective low-frequency background noise reduction
• Internal OTP-ROM for permanent storage of microphone gain calibration settings
• Integrated VNEG charge pump enabling true-ground headphone output without external DC-decoupling capacitors

Applications

• Ear pieces
• Headsets
• Hands-Free Kits
• Mobile Phones
• Voice Communicating Devices

Procurement Notes

Verify the package type against the datasheet specifications. The official documentation lists QFN24 packages for the AS3501 series. Confirm that the 'EQFP' designation in the model number corresponds to the specific ordering suffix required for your application, as standard variants are typically supplied in QFN packages.

Selection Notes

Select this component for applications requiring low-power analog noise cancellation in battery-operated devices. Ensure the design accommodates the 1.0V to 1.8V supply range and utilizes the internal charge pump for negative rail generation. Consider the feed-forward topology limitations regarding frequency range when defining acoustic requirements.

Part Context

The AS3501 belongs to the AS3500/01/02 family of low-power ambient noise-cancelling speaker drivers manufactured by ams (now ams-OSRAM). These devices are engineered to improve audio quality in portable electronics by actively reducing background noise through analog signal processing rather than digital methods.

Replacement Considerations

AS3500 and AS3502 are part of the same product family but differ in operational amplifier configurations and pin counts. Verify functional compatibility before substitution.