AS3502-EQFP

Overview

The AS3502-EQFP 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 and feed-back topologies with filter loops optimized via simple RC components. It includes a high-efficiency headphone amplifier, microphone input with AGC, and line input capabilities.

Feature Summary

• Fully analog ambient noise cancellation using feed-forward or feed-back topologies with user-optimizable 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 limiter functions
• 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 specific package type matches the datasheet description for the AS3502 variant, which utilizes a QFN32 package with 0.5mm pitch. Confirm that the ordering suffix corresponds to the required tape and reel configuration if applicable. Ensure compatibility with the intended supply voltage range of 1.0V to 1.8V during component selection.

Selection Notes

Select this component for applications requiring low-power analog noise cancellation in portable audio devices. The AS3502 variant offers an additional operational amplifier stage compared to the AS3501, enabling more complex feed-back ANC configurations. Consider the QFN32 package constraints and the need for external flying capacitors for the charge pump when designing the PCB layout.

Part Context

The AS3502 is part of the AS3500/01/02 family of low-power ambient noise-cancelling speaker drivers manufactured by ams-OSRAM USA INC. These devices are designed to improve audio quality in battery-powered portable electronics by actively reducing background noise through analog signal processing techniques.

Replacement Considerations

AS3500 and AS3501 are functionally related members of the same product family but differ in package options and internal operational amplifier configurations. Verify pinout compatibility and feature set alignment before substitution.