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PCM2706电脑不认识!

Other Parts Discussed in Thread: PCM2706

如同标题!本人用的是有源12MHz的外部晶体,PCM2706输出iis信号给PMC1794解码!

电路如下:

问题是插上电源/USB插上电脑后电脑提示“unkown USB device”

请大家帮忙看看,谢谢!(按以前做过的DAC电路修改也一样/以前的板是可以正常工作的,会不会芯片已经挂了)