AS3502-EQFP-500

Overview

The AS3502-EQFP-500 is a low-power ambient noise-cancelling speaker driver designed for handsets, headphones, and earpieces. 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 and feed-back topologies with user-defined filter loops via simple RC components. It includes a high-efficiency headphone amplifier, microphone input with AGC, and an internal OTP-ROM for storing gain calibration settings.

Feature Summary

• Fully analog ambient noise cancellation using feed-forward or feed-back topologies with user-definable filter loops
• High-efficiency headphone amplifier supporting stereo single-ended and bridged modes for various load impedances
• Programmable microphone gain stage with automatic gain control and soft-start functionality
• Internal OTP memory for permanent storage of microphone gain calibration and chip configuration

Applications

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

Procurement Notes

Verify the package type matches the datasheet specification for the AS3502 variant (QFN32). Confirm that the ordering suffix corresponds to the required tape and reel quantity if applicable. Ensure the supplier provides documentation confirming the component meets the electrical characteristics outlined in the official AMS data sheet.

Selection Notes

Select this component for applications requiring low-power analog noise cancellation without DSP overhead. The AS3502 variant offers two operational amplifiers for feed-back ANC or additional filtering stages compared to the AS3501. Consider the QFN32 package for board space constraints and verify compatibility with single-cell battery supplies ranging from 1.0V to 1.8V.

Part Context

The AS3502 belongs to the AS3500/01/02 family of low-power ambient noise-cancelling speaker drivers manufactured by AMS (now ams-OSRAM). These devices are designed to improve audio quality in portable electronics by actively reducing background noise through analog signal processing, offering a cost-effective alternative to digital solutions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.