AS3412-EWLT datasheet(2/85 Pages) AMSOSRAM

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ams Datasheet

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[v1-00] 2016-Apr-06

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AS3412

Ultra Small ANC Speaker Driver

The AS3412 is a 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 OTP-ROM can be optionally used to store the

microphones gain calibration settings. The AS3412 can be used

in different configurations for best trade-off in terms of noise

cancellation, required filtering functions and mechanical

designs. The AS3412 targeting feed-forward topology is used

to effectively reduce frequencies typically up to 2-3 kHz.

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.

Ordering Information and Content Guide appear at end of

datasheet.

Key Benefits & Features

The benefits and features of this device are listed below:

Figure 1:

Added Value of Using AS3412

Applications

The devices are ideal for Ear Pieces, Headsets, Hands-Free Kits,

Mobile Phones, and Voice Communicating Devices.

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 (2.2x2.2mm, 0.4mm pitch)

General Description

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