Wolfson WM8994智能手机多路音频CODEC方案

Wolfson公司的WM8994是高度集成智能手机用超低功耗高保真音频CODEC,具有高保真24位4路DAC和2路ADC,立体声DAC播放的SNR为100dB(A加权),1W立体声/2W单声道D类/AB类扬声器驱动器,无电容W类耳机驱动器,智能的MIC接口和高性能模拟MIC接口,主要应用在智能手机和音乐手机,手提导航仪和移动互联网设备(MID).本文介绍了WM8994主要特性,方框图, 采用数字MIC和数字音频接口的智能手机方框图以及WM8994评估板,功能方框图,详细电路图和所用材料清单(BOM).

The WM8994 is a highly integrated ultra-low power hi-fi CODEC designed for smartphones and other portable devices rich in multimedia features.

An integrated stereo class D/AB speaker driver and class W headphone driver minimize power consumption during audio playback.

The device requires only Vbatt and a 1.8V supply, generating all other internal supply rails from integrated LDOs.

Stereo full duplex asynchronous sample rate conversion and multi-channel digital mixing combined with powerful analogue mixing allow the device to support a huge range of different architectures and use cases.

A fully programmable parametric EQ provides speaker compensation and a dynamic range controller can be used in the ADC or DAC paths for maintaining a constant signal level, maximizing loudness and protecting speakers against overloading and clipping.
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