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AS3418

General Description

Datasheet

• PUBLIC

DS000507

• v4-00 • 2020-Jan-23

│ 3

General Description

The AS3418 speaker driver with Ambient Noise Cancelling function for headsets, headphones or ear

pieces. They are intended to improve quality of e.g. music listening, a phone conversation etc. by

reducing background ambient noise.

The fully analog implementation allows the lowest power consumption, lowest system BOM cost and

most natural received voice enhancement otherwise difficult to achieve with DSP implementations.

The device is designed to be easily applied to existing architectures.

An internal EEPROM can be optionally used to store the microphones gain calibration settings. The

AS3418 can be used in different configurations for best trade-off of noise cancellation, required

filtering functions and mechanical designs.

The AS3418 targeting feed-forward topology is used to effectively reduce frequencies typically up to 2-

3 kHz. The typical bandwidth for a feed-forward system is from 20Hz up to 3 kHz which is lower than

the feed-forward systems.

The filter loop for the system is determined by measurements, for each specific headset individually,

and depends very much on mechanical designs. The gain and phase compensation filter network is

implemented with cheap resistors and capacitors for lowest system costs.

1.1

Key Benefits & Features

The benefits and features of AS3418, Low Noise ANC Solution, are listed below:

Figure 1:

Added Value of Using AS3418

Benefits

Features

Low Noise Floor

Low Noise Amplifiers

Integrated Music Bypass Switch

Depletion mode transistors for passive music

bypass

Smallest ANC form factor

WL-CSP package 2.645mm x 2.545mm; 0.4mm

pitch

Reprogrammable ANC settings

EEPROM Memory for system settings

AS3418 Folha de dados(PDF) 4 Page - ams-OSRAM AG