DESCRIPTION
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.
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.
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.
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 28-
lead SSOP package or the smaller 28 lead quad flat
leadless package (QFN).
FEATURES
• Highly Efficient Headphone Driver
• Audio Performance
- 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)
- 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)
• 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
- I2
S, 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
APPLICATIONS
• Portable MP3 Players and Recorders
• CD and Minidisc Recorders
• PDAs / smartphones 

描述
WM8731的wm8731l（WM8731／L）或是低功率
一个集成的耳机立体声编解码器驱动程序。酒店
一个特别设计的WM8731／L的便携式MP3音频
与语音播放器和录音机。WM8731是酒店
理想的MD，CD - RW和DAT录音机。
立体声麦克风音频输入线和单级是
提供一个静音功能，以及可编程线，
音量控制和偏置电压电平输出适合
在electret型麦克风。
立体声24位多比特∑ΔADC和DAC
用一个数字插值和decimation oversampling
滤波器的设计。数字音频输入字的长度从16位和32
在8kHz到96kHz采样议会是支持的。
立体声音频输出（耳机是缓冲驱动
从一个可编程音量控制，输出线是水平的
因此，随着抗重击静音和电源
circuitry升降。
控制设备是通过一个2或3线串行接口。
接口提供了访问的所有功能，包括
音量控制，声音和勇气，在广泛的功率
管理设施。设备是可用的在一个小28
铅包或更小的28引线SSOP方形扁平
无引线封装（QFN）的。
特征
•1、耳机驱动器
•音频性能
ADC的信噪比大于90dB（A加权）在3.3V，在1.8v 85dB
DAC的信噪比为100dB（A加权）在95db 3.3V，在1.8v
•低功耗
回放只读22mW，8MW（L型）
通过比较模拟的护照，3.5 mW/平方公尺（L型）
数字手术- 3.6V的供应–1.42
2.7 - 3.6V供应手术模拟
3.6V的供应1.8–模拟手术（L型）
ADC和DAC的采样频率（8kHz，96kHz的：
可选择的高通滤波器的ADC。
•2或3线串行控制接口的微处理器
•可编程的音频数据接口模式
碘
左，右的或合理的，DSP
16／20／24／32位字的长度
主或从时钟模式
•一个麦克风输入和electret混频器偏置侧音
•可在28引线SSOP封装或28引脚QFN封装
应用
便携式MP3播放器和录音机。
•记录CD和MD盘
•PDA /智能手机

企业名：深圳市东裕电子科技有限公司

类型：贸易/代理/分销

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