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adc12d1800 I 路工作异常

Other Parts Discussed in Thread: ADC12D1800

项目中一片adc12d1800,两个通道采样,Q路正常,I路异常。

异常的具体现象为:采集噪声测试,从chipscope上观察,DI与DID不重合,多次复位,两者的位置不稳定。原来是重合的,使用一段时间后出现这个现象。

图1是正常现象:

图2是异常现象(红色-DQ和DQD;蓝色-DI;绿色-DID):

这是什么原因造成的?谢谢您的帮助!