Datasheet > WM8721_04

WM8721_04

更新时间： 2024-11-22 04:25:11

品牌	Logo	应用领域
欧胜 - WOLFSON		驱动器
页数	文件大小	规格书
37页	401K
描述
Internet Audio DAC with Integrated Headphone Driver

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中文翻译

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WM8721_04 数据手册

WM8721

Internet Audio DAC with Integrated Headphone Driver

DESCRIPTION

FEATURES

•

Audio Performance

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.

−

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

1.42 – 3.6V Digital Supply Operation

2.7 – 3.6V Analogue Supply Operation

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.

•

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

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.

−

I²S, Left, Right Justified or DSP

16/20/24/32 bit Word Lengths

•

Stereo Audio Outputs

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.

Output Volume and Mute Controls

Highly Efficient Headphone Driver

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.

APPLICATIONS

•

Portable MP3 Players

CD and Minidisc Players

BLOCK DIAGRAM

HPVDD

HPGND

WM8721

CONTROL INTERFACE

+6 to -73dB

1 dB Steps

H/P

DRIVER

VOL/

MUTE

RHPOUT

MUTE

DAC

DACDAT

ROUT

LOUT

DIGITAL

FILTERS

DACLRC

BCLK

MUTE

VOL/

MUTE

H/P

DRIVER

LHPOUT

CLKIN

DIVIDER

(Div x1,

x2)

+6 to -73dB

1 dB Steps

WOLFSON MICROELECTRONICS plc

Production Data, November 2004, Rev 4.0

www.wolfsonmicro.com

12 3 4 5 6 7...37

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