wm9081 Wolfson Microelectronics plc, wm9081 Datasheet

wm9081

Manufacturer Part Number

wm9081

Description

Mono Dac With 2.6w Class Ab/d Speaker Driver, Dynamic Range Controller And Retune Mobile Parametric Equalizer

Manufacturer

Wolfson Microelectronics plc

Datasheet

1.WM9081.pdf (109 pages)

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DESCRIPTION

The WM9081 is designed to provide high power output at

low

applications.

ReTune Mobile Parametric EQ with fully programmable

coefficients is integrated for optimization of speaker

characteristics. Programmable dynamic range control is

also available for maximizing loudness, protecting speakers

from clipping and preventing premature shutdown due to

battery droop.

Digital input enables the power drivers to be located close to

the speakers in multi-channel systems without the need for

troublesome long analogue connections. Location of the

power drivers close to the speakers also removes the need

for bulky and expensive class D filters and reduces PCB

track lengths, minimising emissions. The digital input can

also help to minimise crosstalk to the speaker output

signal from high gain microphone inputs, enhancing stability

and reducing the risk of ‘howling’ during speakerphone

operation.

Four control interface addresses and four-channel TDM are

supported to allow multiple devices to be configured and

driven independently.

The device is controlled via a standard 2-wire, 3-wire, or 4-

wire control interface or by hardware control pins.

BLOCK DIAGRAM

WOLFSON MICROELECTRONICS plc

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distortion

Dynamic Range Controller and ReTune Mobile Parametric Equalizer

levels

Mono DAC with 2.6W Class AB/D Speaker Driver,

space-constrained

http://www.wolfsonmicro.com/enews/

portable

FEATURES

•

APPLICATIONS

•

High-power, high performance DAC and speaker driver

−

ReTune Mobile Parametric Equalizer

−

Programmable dynamic range controller

−

Speaker common mode boost

−

Low power FLL

−

All common sample rates from 8kHz to 96kHz supported

Standard 2-wire, 3-wire, 4-wire and hardware control

modes

Data formats: LJ, RJ, I

Thermal shutdown interrupt

4x4 COL package (0.45mm lead pitch)

Operating temperature range: -40°C to 85°C

Portable navigation systems

Mobile phones

Flat panel TVs

92dB SNR (‘A-weighted’) in Class D mode

97dB SNR (‘A-weighted’) in Class AB mode

<0.05% THD+N @0.5W continuous into 4Ω (Class D)

<0.10% THD+N @2W continuous into 4Ω (Class D)

2.6W maximum peak power

Fully programmable filter coefficients

Boosts small signals to maximise loudness

Protects against battery droop and clipping

Maximises power for a given SPKVDD/AVDD ratio

Provides all necessary internal clocks

32kHz to 27MHz input frequency

S, DSP, all with TDM support

Pre-Production, April 2009, Rev 3.0

WM9081

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