WM8721 datasheet(1/34 Pages) WOLFSON

部件名	WM8721

功能描述	Internet Audio DAC with Integrated Headphone Driver

PDF	34 Pages

Scroll/Zoom	100%

制造商	WOLFSON [Wolfson Microelectronics plc]

网页	http://www.wolfsonmicro.com

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WM8721

Internet Audio DAC with Integrated Headphone Driver

Product Preview, November 2000, Rev 1.3

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

.

DESCRIPTION

The WM8721 is a low power stereo DAC with an integrated

headphone driver. The WM8721 is designed specifically for

portable MP3 audio and speech players. The WM8721 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 20-

pin SSOP package.

A USB mode is provided where all audio rates can be

derived from a simple 12MHz MCLK, saving on need for

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

−

I

2S, Left, Right Justified or DSP

−

16/20/24/32 bit Word Lengths

•

Stereo Audio Outputs

•

Output Volume and Mute Controls

•

Highly Efficient Headphone Driver

•

Playback Mode Power Consumption < 18mW

•

20-Pin SSOP Package

APPLICATIONS

•

Portable MP3 Players

•

CD and Minidisc Players

BLOCK DIAGRAM

DIGITAL

FILTERS

CONTROL INTERFACE

DAC

VOL/

MUTE

VOL/

MUTE

H/P

DRIVER

H/P

DRIVER

RHPOUT

LHPOUT

ROUT

LOUT

+6 to -73dB

1 dB Steps

HPVDD

HPGND

+6 to -73dB

1 dB Steps

DACLRC (4)

BCLK (2)

DACDAT (3)

WM8721

(15)

(16)

(17)

(14)

(11)

(13)

(12)

(18)

(19)

(1)

(20)

(5)

(8)

(7)

(10)

(9)

(6)

CLKIN

DIVIDER

(Div x1, x2)

类似零件编号 - WM8721

制造商	部件名	数据表	功能描述
Wolfson Microelectronic...	WM8721	128Kb / 2P	portable digital audio solutions
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	WM8721EDS	128Kb / 2P	portable digital audio solutions
	WM8721L	128Kb / 2P	portable digital audio solutions
	WM8721L	409Kb / 37P	Internet Audio DAC with Integrated Headphone Driver

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