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PGA2505有“啪啪“噪音

Other Parts Discussed in Thread: PGA2505

我用PGA2505做了个话放,然后经过ADC和DAC后,最后耳机输出。我改变PGA2505增益的时候会有“啪啪”的噪声,但是当我重复配置相同增益的时候没有“啪啪”噪音。我把PGA2505的“过零检测”和“直流伺服”都开启了,请问这是怎么回事?谢谢。