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PCM5121: 高频信号产生原因

Part Number: PCM5121

在PCM5121 OUTL&OUTR串10uF,并上100nF时,输出所有信号都会叠加一个400-500khz的高频正弦波?当将100nF去掉,或者在10uF串100R电阻时,此高频信号消失。请问产生此高频信号的原因是什么?