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AFE032器件的底噪问题

Other Parts Discussed in Thread: AFE032

在使用AFE03作为接收机的过程中,我们发现在没有任何信号输入的时候AD能够采集到60KHz和120KHz的幅值大约为60mVpp的正弦波信号,在断开AFE032后AD就采不到该噪声,请问下可能是什么原因造成该噪声的产生?AFE032的3.3V电源和AD的3.3电源是一样的,可能是开关电源引入的噪声嘛?