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Product Detailed Parameters
- Description：IC AMP CLASS AB STEREO 24QFN
- Series：-
- Mfr：ams-OSRAM USA INC.
- Package：Tape & Reel (TR),Cut Tape (CT)
- 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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Overview
The AS3421-EQFP-500 is a low-power ambient noise-canceling speaker driver designed for headsets and headphones. It features fully analog implementation with feed-forward or feedback topologies, supporting 128 microphone gain steps and 64 line input volume steps. The device operates on a 1.0V to 1.8V supply, delivering up to 2x23mW output power at 32Ω with 100dB SNR. It includes an internal OTP ROM for calibration settings and utilizes a 2-wire serial interface for control.
Feature Summary
- Fully analog ambient noise cancellation with selectable feed-forward or feedback topology
- Integrated programmable gain amplifier with automatic gain control and limiter functions
- Low quiescent current consumption with automatic power-down in standby modes
- Internal charge pump generating negative supply voltage for headphone amplifiers
Applications
- Stereo Bluetooth headsets
- Wireless stereo headsets
- Ear pieces and headphones requiring active noise reduction
Procurement Notes
Verify the specific suffix 'EQFP-500' against official Microchip/ams-OSRAM documentation to confirm package type and tape/reel specifications. Ensure compatibility with existing BOM components regarding pin assignments and thermal requirements. Confirm that the ordering code matches the exact revision required for your design.
Selection Notes
Select this component for applications prioritizing low power consumption and minimal external component count. The fully analog architecture reduces system cost compared to DSP solutions. Consider the available feed-forward or feedback configurations based on the mechanical design of the headset and the desired frequency range for noise attenuation.
Part Context
This part belongs to the AS3421/AS3422 family of audio drivers from ams-OSRAM (formerly austriamicrosystems). These devices are specialized for consumer audio electronics where battery life and sound quality are critical. The family integrates microphone pre-amplification, ANC processing, and headphone driving capabilities into a single chip.
Replacement Considerations
Check datasheet for direct pin-compatible alternatives within the same product family. Verify functional equivalence regarding ANC topology support and power supply requirements before substitution.
