AS3430 datasheet(1/51 Pages) AMSCO

部件名	AS3430

功能描述	Low Power Ambient Noise-Cancelling Speaker Driver

PDF	51 Pages

Scroll/Zoom	100%

制造商	AMSCO [ams AG]

网页	http://www.ams.com

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AS3400 AS3410 AS3430

Low Power Ambient Noise-Cancelling Speaker Driver

www.austriamicrosystems.com

Revision 1.02

1 - 51

1 General Description

The AS3400/10/30 are speaker driver with Ambient Noise Cancelling

function for handsets, headphones or ear pieces. It is 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 AS3400/10/30 can be used in different configurations for best

trade-off of noise cancellation, required filtering functions and

mechanical designs.

The simpler feed-forward topology is used to effectively reduce low

frequency background noise. The feed-back topology with either 1 or

2 filtering stages can be used to reduce noise for a larger frequency

range, and to even implement transfer functions like speaker

equalization, Baxandall equalization, high/low shelving filter and to

set a predefined loop bandwidth.

The filter loop is optimized by the user for specific handset electrical

and mechanical designs by dimensioning simple R, C components.

Most handset implementations will make use of a single noise

detecting microphone. Two microphones could be used to allow for

increased flexibility of their location in the handset mechanical

design. Using the bridged mode allows to even drive high impedance

headsets.

2 Key Features

Microphone Input

128 gain steps @ 0.375dB and MUTE with AGC

Differential, low noise microphone amplifier

Single ended or differential mode

Improved supply for electret microphone

MIC gain OTP programmable

High Efficiency Headphone Amplifier

2x34mW, 0.1% THD @ 16

Ω, 1.5V supply,

100dB SNR

Bridged mode for e.g. 300

Ω loads

Click and pop less start-up and mode switching

Line Input

Volume control via serial interface or volume pin

64 steps @ 0.75dB and MUTE, pop-free gain setting

Single ended stereo or mono differential mode

ANC processing

Feed-forward cancellation

Feed-back cancellation with filter loop transfer function

definable via simple RC components

Simple in production SW calibration

12-30dB noise reduction (headset dependent)

10-2000Hz wide frequency active noise attenuation (headset

dependent)

Monitor Function

For assisted hearing, i.e. to monitor announcements

Fixed (OTP prog.) ambient sound amplification to compensate

headphone passive attenuation

Volume controlled ambient sound amplification mixed with fixed

(OTP prog.) attenuation of LineIn

Incremental Functions

ANC with or without music on the receiving path

Improved dynamic range playback

OTP ROM for automatic trimming during production (4 times

programbable)

Performance Parameter

5/3.8mA @ 1.5V stereo/mono ANC; <1µA quiescent

Extended PSRR for 217Hz

Interfaces

2-wire serial control mode & volume inputs

Calibration via Line-In or 2-wire serial interface (patent pending)

Single cell or fixed 1.0-1.8V supply with internal CP

Package

AS3400, AS3410 QFN24 [4x4mm] 0.5mm pitch

AS3430 QFN32 [5.x5mm] 0.5mm pitch

3 Applications

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

Mobile Phones, and Voice Communicating Devices.

类似零件编号 - AS3430

制造商	部件名	数据表	功能描述
ams AG	AS3430	198Kb / 3P	Low Power Ambient Noise-Cancelling Speaker Driver
	AS3430	1Mb / 51P	Low Power Ambient Noise-Cancelling Speaker Driver
	AS3430-EK-ST	1Mb / 51P	Low Power Ambient Noise-Cancelling Speaker Driver

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