XWM8721EDS Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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XWM8721EDS

Internet Audio DAC with Integrated Headphone Driver

Wolfson Microelectronics plc 

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WM8721

Internet Audio DAC with Integrated Headphone Driver

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 or 24MHz master clock,

eliminating the need for a PLL or multiple crystals.

BLOCK DIAGRAM

FEATURES

• Audio Performance

− DAC SNR 100dB (‘A’ weighted) at AVDD = 3.3V

− 1.42 – 3.6V Digital Supply Operation

− 2.7 – 3.6V Analogue Supply Operation

• Low Power

− Headphone Playback: 20mW at AVDD = 3.3V

• 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

• Stereo Audio Outputs

• Output Volume and Mute Controls

• Highly Efficient Headphone Driver

• 20-Pin SSOP Package

APPLICATIONS

• Portable MP3 Players

• CD and Minidisc Players

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WM8721

CONTROL INTERFACE

DACDAT

DACLRC

BCLK

DIGITAL

FILTERS

CLKIN

DIVIDER

(Div x1,

x2)

DAC

DAC

MUTE

+6 to -73dB

1 dB Steps

VOL/

MUTE

H/P

DRIVER

MUTE

VOL/

MUTE

+6 to -73dB

1 dB Steps

H/P

DRIVER

HPVDD

HPGND

RHPOUT

ROUT

LOUT

LHPOUT

WOLFSON MICROELECTRONICS plc

www.wolfsonmicro.com

Production Data, November 2004, Rev 4.0

Copyright 2004 Wolfson Microelectronics plc

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