AS3418-EWLM

Overview

The AS3418-EWLM is a fully analog active noise cancellation (ANC) solution designed for headsets, headphones, and earpieces. It operates on a single supply voltage ranging from 1.4V to 1.8V. The device features stereo microphone inputs with programmable gain up to 31dB, integrated music bypass switches, and a headphone amplifier capable of delivering 2x34mW into a 32Ω load in stereo mode or 100mW in bridged mono mode. It utilizes a WL-CSP package measuring 2.645mm x 2.545mm.

Feature Summary

• Fully analog implementation for low power consumption and natural voice enhancement
• Integrated passive music bypass switches replacing external analog switches
• Internal EEPROM for storing reprogrammable ANC settings and microphone calibration
• Low noise floor with dedicated DC offset cancellation for microphone inputs

Applications

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

Procurement Notes

Verify the specific ordering code suffix against official documentation to confirm delivery form and quantity. Confirm that the component meets required environmental standards and moisture sensitivity levels before integration. Ensure compatibility with existing I2C control interfaces and mechanical design constraints associated with the small form factor package.

Selection Notes

Select this component for applications requiring minimal system bill of materials and lowest possible power consumption compared to DSP implementations. It is suitable for feed-forward topologies targeting frequencies up to 3kHz. Consider the integrated music bypass feature if space for external switches is limited. Evaluate the trade-off between high-quality and ECO modes based on battery life requirements.

Part Context

The AS3418 belongs to the AS34xx series of audio amplifiers by ams-OSRAM USA INC., specifically engineered for active noise cancellation. It targets portable consumer electronics where size and power efficiency are critical. The device integrates microphone preamplifiers, ANC filter operational amplifiers, and headphone drivers into a single compact package.

Replacement Considerations

Check for updated versions within the AS34xx family or alternative analog ANC solutions from the same manufacturer. Verify pin-to-pin compatibility and register map alignment if substituting with other models like the AS3415 or AS3435.