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PCM4220采集恒定电压时,随采样速率变化而变化。

Other Parts Discussed in Thread: PCM4220

您好,最近使用PCM4220做采集实验。但是使用过程中发现:在我更改MCLK后,即AD采样速率变化后,输出的基准电压2.8V会有上下的摆动。在低速模式,8k~54k时,采集的1V直流电压,会有0.1V的误差。但是我用万用表测试,1V的电压是准的。原因是输出的基准2.8V在变,请问这是正常的吗?