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XWM8711EDS

Internet Audio DAC with Integrated Headphone Driver

Wolfson Microelectronics plc 

WM8711

Internet Audio DAC with Integrated Headphone Driver

Product Preview, Novembert 2000, 1.2

DESCRIPTION

The WM8711 is a low power stereo DAC with an integrated

headphone driver. The WM8711 is designed specifically for

portable MP3 audio and speech players. The WM8711 is

also ideal for MD, CD machines and DAT players.

Stereo 24-bit multi-bit sigma delta DACs are used with

oversampling digital interpolation 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.

A USB mode is provided where all audio rates can be

derived from a single 12MHz MCLK, saving on the need for

a PLL or multiple crystals.

FEATURES

• Audio Performance

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

- 1.42 – 3.6V Digital Supply Operation

- 2.7 – 3.6V Analogue Supply Operation

• DAC Sampling Frequency: 8KHz – 96KHz

• 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 Outputs

• Output Volume and Mute Controls

• Highly Efficient Headphone Driver

• Playback Mode Power Consumption < 18mW

• 28-Pin SSOP Package

APPLICATIONS

• Portable MP3 Players

• CD and Minidisc Players

BLOCK DIAGRAM

(22) (23) (24) (21)

(14) (16) (15)

WM8711

CONTROL INTERFACE

DACDAT (4)

DACLRC (5)

BCLK (3)

DAC

MUTE

Σ

VOL/

MUTE

+6 to -73dB

1 dB Steps

H/P

DRIVER

DIGITAL

FILTERS

OSC

DAC

Σ

CLKIN

DIVIDER

(Div x1, x2)

CLKIN

DIVIDER

(Div x1, x2)

MUTE

+6 to -73dB

1 dB Steps

VOL/

MUTE

H/P

DRIVER

(26) (25)

(2)

(27) (1) (28)

(8) HPVDD

(11) HPGND

(19) RLINEIN

(10) RHPOUT

(13) ROUT

(12) LOUT

(9) LHPOUT

(20) LLINEIN

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

http://www.wolfson.co.uk

Product Preview data sheets contain

specifications for products in the formative

phase of development. These products may

be changed or discontinued without notice.

2000 Wolfson Microelectronics Ltd.

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