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WM8739 / WM8739L

Stereo Audio ADC

DESCRIPTION

The WM8739 is a stereo audio ADC. The WM8739 is

designed specifically for portable MP3 audio and speech

players and recorders. The WM8739 is also ideal for MD,

CD-RW machines and DAT recorders.

Stereo line-level audio inputs are provided, along with a

mute and volume function, and master or slave mode

clocking schemes. The device also has a programmable

high pass filter to remove residual DC offsets.

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

oversampling digital interpolation and digital filters. Digital

audio output word lengths from 16-32 bits and sampling

rates from 8KHz to 96KHz are supported.

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.

FEATURES

鈥?/div>

90dB SNR (鈥楢鈥?weighted @ 48kHz) ADC

Low Power

- 12mW all-on, 1.4mW standby (鈥楲鈥?version)

- 41mW all-on, 5.3mW standby (standard version)

Low Supply Voltages

- 1.8 鈥?3.6V Analogue Supply (鈥楲鈥?version)

- 2.7 鈥?3.6V Analogue Supply (standard version)

- 1.42 鈥?3.6V Digital Supply (both versions)

Input Volume and Mute Controls

ADC Sampling Frequency: 8KHz 鈥?96KHz

Selectable ADC High Pass Filter

2 or 3-Wire MPU Serial Control Interface

Programmable Audio Data Interface Modes

- I

2

S, Left, Right Justified or DSP

- 16/20/24/32 bit Word Lengths

- Master or Slave Clocking Mode

20-Pin SSOP or 5x5mm QFN Package Options

鈥?/div>

APPLICATIONS

鈥?/div>

CD, Minidisc and DAT Recorders

General Purpose Audio Digitisation

BLOCK DIAGRAM

SDIN

CSB

MODE

SCLK

AVDD

CONTROL INTERFACE

VMID

WM8739

AGND

DIGTAL AUDIO INTERFACE

RLINEIN

VOL/

MUTE

ADC

+12 to -34.5dB,

1.5dB Steps

ADCDAT

ADCLRC

DIGITAL

FILTERS

LLINEIN

VOL/

MUTE

ADC

BCLK

+12 to -34.5dB,

1.5dB Steps

OSC

DIV2

WOLFSON MICROELECTRONICS LTD

www.wolfsonmicro.com

XTI/MCLK

XTO

DCVDD

DBVDD

DGND

Advanced Information, September 2001, Rev 2.2

Copyright

餂?001

Wolfson Microelectronics Ltd

.

型號(hào)

版本

描述

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