Wolfson WM8910超低功耗立体声DAC方案
Wolfson公司的WM8910是高性能超低功耗立体声DAC,采用Wolfson的W类放大器技术,具有立体声参考地耳机放大器,不需要耳机输出耦合电容,典型的SNR为96dB,THD为-86dB,DAC到耳机播放的功耗为4.5mW,取样频率从8kHz到96kHz,单个寄存器用来写入默认的起动顺序,集成的FLL提供了所有`必要的时钟,主要用在手提媒体播放器,多媒体手机和手持游戏机.本文介绍了WM8910主要特性,方框图以及外部元件连接图.
The WM8910 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. Both headphone and line 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 sequencer to reduce software driver development and eliminate pops and clicks via Wolfson’s SilentSwitch™ technology.
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