WM8731 Wolfson Microelectronics Ltd., WM8731 Datasheet

WM8731

Manufacturer Part Number

WM8731

Description

WM8731 : Low Power Audio Codec With Integrated Headphone Driver

Manufacturer

Wolfson Microelectronics Ltd.

Datasheet

1.WM8731.pdf (59 pages)

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Current page: 1 of 59
Download datasheet (648Kb)

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 or 28 lead quad flat leadless package.

BLOCK DIAGRAM

WOLFSON MICROELECTRONICS LTD

www.wolfsonmicro.com

Portable Internet Audio CODEC with Headphone Driver

MICBIAS

RLINEIN

LLINEIN

MICIN

AGND

AVDD

VMID

+12 to -34.5dB,

1.5dB Steps

VOL

OSC

20dB

0dB/

and Programmable Sample Rates

(Div x1, x2)

DIVIDER

CLKIN

MUTE

MUX

(Div x1, x2)

CLKOUT

DIVIDER

ADC

CONTROL INTERFACE

DIGTAL AUDIO INTERFACE

FILTERS

DIGITAL

FEATURES

APPLICATIONS

DAC

Audio Performance

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

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 22mW

Analogue Pass Through Power Consumption 12mW

Available in two package options:

Portable MP3 Players and Recorders

CD and Minidisc Recorders

90dB 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

16/20/24/32 bit Word Lengths

Master or Slave Clocking Mode

28-Pin SSOP Package

28-Pin QFN Package

Bypass

Side Tone

Bypass

S, Left, Right Justified or DSP

ATTEN/

MUTE

Advanced Information, August 2001, Rev 2.3

+6 to -73dB

1 dB Steps

+6 to -73dB

1 dB Steps

MUTE

VOL/

WM8731

DRIVER

H/P

2001 Wolfson Microelectronics Ltd

WM8731

HPVDD

LOUT

LHPOUT

RHPOUT

ROUT

HPGND

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