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PCM2704应用的问题,数字地和模拟地如何连接?



最近在试着作一块DAC的板子,体积做的小一些,用于移动设备上,但是在Dgnd和Agnd处理上遇到一些问题.

DAC板子插到到手机上会有很大的射频信号的声音,偶尔还会出现呲呲的声音.

DAC是从手机的USB取电的。 

现在的板子整个GND是直接连接的