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PGA460: AFE是不是坏了

Part Number: PGA460

用示波器单独看接收探头正极是有回波信号的,但将接收探头正极接到PGA460的输入端再看就看不到回波信号了,而是一个和发射信号一样但幅度小一点的信号,读取测量数据返回的一直是FF。这是不是PGA460的AFE坏了啊,为什么会坏呢?前几天不是正常的