Wolfson WM8912超低功耗立体声DAC评估方案

Wolfson公司的WM8912 是高性能超低功耗立体声DAC,非常适合手提音频应用. WM8912具有采用Wolfson”W类”放大器技术的参考地立体声耳机放大器,每路向16欧姆提供30mW时的THD小于1%,DAC的SNR典型值为96dB,THD为-86dB, 主要用于手提多媒体播放器,多媒体手机和手持游戏机.本文介绍WM8912主要特性,方框图,以及评估板WM8912-6201-FL32-M 电路和所用材料清单(BOM).

The WM8912 is a high performance ultra-low power stereo DAC optimised for portable audio applications.

The device features stereo ground-referenced headphone amplifiers using the Wolfson ‘Class-W’ amplifier techniques - incorporating an innovative dual-mode charge pump architecture - to optimise efficiency and power consumption during playback. The ground-referenced outputs eliminate headphone coupling capacitors. The outputs include
common mode feedback paths to reject ground noise.

Control sequences for audio path setup can be pre-loaded and executed by an integrated control write sequencer to reduce software driver development and minimise pops and
clicks via Wolfson’s SilentSwitch™ technology.

A dynamic range controller provides compression and level control to support a wide range of portable recording applications. Anti-clip and quick release features offer good
performance in the presence of loud impulsive noises...

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