AS3421-EQFP

Description：IC AMP CLASS AB STEREO 24QFN
Series：-
Mfr：ams-OSRAM USA INC.
Package：Tape & Reel (TR)

SKU:03c78eed18e1 Category: Audio Amplifiers Brand: ams-OSRAM USA INC.

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Product introduction

Product Detailed Parameters

Description：IC AMP CLASS AB STEREO 24QFN
Series：-
Mfr：ams-OSRAM USA INC.
Package：Tape & Reel (TR)
Type：Class AB
Output Type：Headphones, 2-Channel (Stereo)
Max Output Power x Channels @ Load：-
Voltage - Supply：1V ~ 1.8V
Features：Depop, Differential Inputs, I2C, Input Multiplexer, Microphone, Mute, Short-Circuit Protection, Volume Control
Mounting Type：Surface Mount
Supplier Device Package：24-QFN (4x4)
Package / Case：24-VFQFN Exposed Pad
Operating Temperature：-20°C ~ 85°C (TA)
Grade：-
Qualification：-

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AS3421-EQFP

Overview

The AS3421-EQFP is a low-power ambient noise cancelling speaker driver designed for headsets and headphones. It features fully analog implementation with feed-forward or feedback topologies, delivering up to 2x23mW output at 0.1% THD+N into 32Ω loads on a 1.5V supply. The device includes a differential microphone amplifier with AGC, line inputs, and an internal OTP ROM for calibration settings. Operating within a 1.0V to 1.8V supply range, it achieves less than 1µA quiescent current in off mode and supports a 2-wire serial interface for control.

Feature Summary

Fully analog ambient noise cancellation supporting both feed-forward and feedback topologies for effective background noise reduction.
Integrated high-efficiency headphone amplifier with bridged mode capability and pop-clickless startup functionality.
Low power consumption architecture featuring automatic block shutdown in playback-only mode and ultra-low standby current.
Programmable microphone gain stage with automatic gain control and dedicated bias supply management.

Applications

Stereo Bluetooth headsets
Stereo wireless headsets
Ear pieces

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and tape/reel specifications. Confirm that the component meets RoHS compliance requirements for your target market. Ensure the design accommodates the exposed pad connection guidelines specified in the datasheet to maintain thermal and electrical performance standards.

Selection Notes

Select the AS3421 variant for applications requiring a QFN24 package with feed-forward topology support. Choose the AS3422 variant if a QFN32 package is required or if additional filtering stages via a second operational amplifier are needed for feedback ANC implementations. Consider the mechanical design constraints when choosing between feed-forward and feedback configurations.

Part Context

This component belongs to the AS3421/AS3422 series of audio amplifiers manufactured by ams OSRAM. These devices are engineered specifically for mobile audio accessories where power efficiency and voice quality are critical. The series utilizes proprietary analog processing to achieve noise cancellation without the complexity of digital signal processors.