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ADC3663: ADC3663信号输入端口异常

Part Number: ADC3663
Other Parts Discussed in Thread: , ADC3683EVM

ADC3663输入级电路按照手册推荐的方式设计,但没接终端电阻。通过信号发生器给正弦信号,经单端转差分后,示波器测量进入ADC前的信号,发现正弦波变得不规则,有锯齿状缺口。

断开ADC3663信号输入前端的10Ω,发现是ADC3663引起的波形异常,输入端的波形如下:

目前,ADC3663没有进行SPI配置,也没有给时钟。不知为何会这样?严重影响模拟信号的测试,请问大概率是哪里的问题?谢谢!