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PCM1804: PCM1804时,发现ADC在转换过程中产生3次谐波较大

Part Number: PCM1804
Other Parts Discussed in Thread: PCM1798, LM317

我们在使用TI的PCM1804时,发现ADC在转换过程中产生3次谐波较大,影响失真度,具体如图,问一下,有没有好建议,以及设计的时候有什么特别需要注意的事项吗