XWM8731EDS View Datasheet(PDF) - Wolfson Microelectronics plc

Part Name

Description

Manufacturer

XWM8731EDS

Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates

Wolfson Microelectronics plc 

WM8731

Portable Internet Audio CODEC with

Headphone Driver and Programmable Sample Rates

DESCRIPTION

The WM8731 is a low power stereo CODEC with an

integrated headphone driver. It offers the user the unique

ability to independently program the ADC and DAC sample

rates from a single clock source. The WM8731 is designed

specifically for portable MP3 audio and speech players and

recorders. The WM8731 is also ideal for MD, CD-RW

machines and DAT recorders.

Stereo line and mono microphone level audio inputs are

provided, along with a mute function, programmable line

level volume control and a bias voltage output suitable for

an electret type microphone.

Stereo 24-bit multi-bit sigma delta ADCs and DACs are

used with oversampling digital interpolation and decimation

filters. Digital audio input word lengths from 16-32 bits and

sampling rates from 8kHz to 96kHz are supported.

Stereo audio outputs are buffered for driving headphones

from a programmable volume control, line level outputs are

also provided along with anti-thump mute and power

up/down circuitry.

The device is controlled via a 2 or 3 wire serial interface.

The interface provides access to all features including

volume controls, mutes, de-emphasis and extensive power

management facilities. The device is available in a small 28-

pin SSOP package.

BLOCK DIAGRAM

Advanced Information, Rev 2.0, February 2001

FEATURES

• Audio Performance

− 97dB SNR (‘A’ weighted @ 48kHz) ADC

− 100dB SNR (‘A’ weighted @ 48kHz) DAC

− 1.42 – 3.6V Digital Supply Operation

− 2.7 – 3.6V Analogue Supply Operation

• ADC and DAC Sampling Frequency: 8kHz – 96kHz

• Selectable ADC High Pass Filter

• 2 or 3-Wire MPU Serial Control Interface

• Programmable Audio Data Interface Modes

− I2S, Left, Right Justified or DSP

− 16/20/24/32 bit Word Lengths

− Master or Slave Clocking Mode

• Stereo Audio Inputs and Outputs

• Microphone Input and Electret Bias with Side Tone Mixer

• Input and Output Volume and Mute Controls

• Highly Efficient Headphone Driver

• Playback Mode Power Consumption < 18mW

• Analogue Pass Through Power Consumption < 9mW

• 28-Pin SSOP Package

APPLICATIONS

• Portable MP3 Players and Recorders

• CD and Minidisc Recorders

AVDD

VMID

AGND

MICBIAS

RLINEIN

MICIN

VOL

+12 to -34.5dB,

1.5dB Steps

0dB/

20dB

LLINEIN

VOL

+12 to -34.5dB,

1.5dB Steps

MUTE

MUTE

MUX

MUTE

MUTE

MUX

ADC

ADC

OSC

CLKIN

DIVIDER

(Div x1, x2)

CLKOUT

DIVIDER

(Div x1, x2)

CONTROL INTERFACE

Bypass

MUTE

ATTEN/

MUTE

Side Tone

DAC

MUTE

Σ

DIGITAL

FILTERS

DAC

MUTE

Σ

DIGTAL AUDIO INTERFACE

Side Tone

ATTEN/

MUTE

MUTE

Bypass

WM8731

+6 to -73dB

1 dB Steps

VOL/

MUTE

H/P

DRIVER

HPVDD

HPGND

RHPOUT

ROUT

LOUT

VOL/

MUTE

+6 to -73dB

1 dB Steps

H/P

DRIVER

LHPOUT

WOLFSON MICROELECTRONICS LTD

Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK

Tel: +44 (0) 131 667 9386

Fax: +44 (0) 131 667 5176

Email: sales@wolfson.co.uk

www.wolfsonmicro.com

Advanced Information data sheets

contain preliminary data on new products

in the preproduction phase of

development. Supplementary data will be

published at a later date.

2001 Wolfson Microelectronics Ltd.

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