Datasheet > CDBWM8731L-M-1

CDBWM8731L-M-1

更新时间： 2024-11-21 20:10:59

品牌	Logo	应用领域
凌云 - CIRRUS		/
页数	文件大小	规格书
65页	800K
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CDBWM8731L-M-1 数据手册

WM8731 / WM8731L

Portable Internet Audio CODEC with Headphone Driver

and Programmable Sample Rates

DESCRIPTION

FEATURES



Highly Efficient Headphone Driver

Audio Performance

The WM8731 or WM8731L (WM8731/L) are low power

stereo CODECs with an integrated headphone driver. The

WM8731/L is designed specifically for portable MP3 audio

and speech players and recorders. The WM8731 is also

ideal for MD, CD-RW machines and DAT recorders.

ADC SNR 90dB (‘A’ weighted) at 3.3V, 85dB at 1.8V

DAC SNR 100dB (‘A’ weighted) at 3.3V, 95dB at 1.8V



Low Power

Playback only 22mW, 8mW (‘L’ Variant)

Stereo line and mono microphone level audio inputs are

provided, along with a mute function, programmable line

level volume control and a bias voltage output suitable for

an electret type microphone.

Analogue Pass Through 12mW, 3.5mW (‘L’ variant)

1.42 – 3.6V Digital Supply Operation

2.7 – 3.6V Analogue Supply Operation

1.8 – 3.6V Analogue Supply Operation (‘L’ Variant)

Stereo 24-bit multi-bit sigma delta ADCs and DACs are used

with oversampling digital interpolation and decimation filters.

Digital audio input word lengths from 16-32 bits and

sampling rates from 8kHz to 96kHz are supported.



ADC and DAC Sampling Frequency: 8kHz – 96kHz

Selectable ADC High Pass Filter

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

Master or Slave Clocking Mode



Microphone Input and Electret Bias with Side Tone Mixer

Available in 28-lead SSOP or 28-lead QFN package

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-

lead SSOP package or the smaller 28 lead quad flat

leadless package (QFN).

APPLICATIONS



Portable MP3 Players and Recorders

CD and Minidisc Recorders

PDAs / smartphones

BLOCK DIAGRAM

AVDD

CONTROL INTERFACE

WM8731

VMID

HPVDD

HPGND

Bypass

MUTE

AGND

ATTEN

MUTE

+ 6 to -73 dB

dB Steps

Side Tone

H /P

DRIVER

MICBIAS

RLINEIN

VOL

RHPOUT

MUTE

VOL

MUTE

MUX

ADC

DAC

+ 12 to -34 .5 dB , 1.5 dB

Steps

ROUT

LOUT

0 dB /

20 dB

DIGITAL

FILTERS

MICIN

MUTE

MUX

MUTE

VOL

LLINEIN

VOL

H/P

DRIVER

LHPOUT

MUTE

+ 12 to -34 .5 dB , 1.5 dB

Steps

Side Tone

+ 6 to -73 dB

dB Steps

ATTEN

MUTE

CLKOUT

DIVIDER

CLKIN

DIVIDER

Bypass

DIGTAL AUDIO INTERFACE

OSC

( Div x 1 , x2)

Production Data, October 2012, Rev 4.9

WOLFSON MICROELECTRONICS plc

12 3 4 5 6 7...65

中文翻译

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