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ads7223,convst信号对模拟输入有干扰

Other Parts Discussed in Thread: ADS7223

大家好:
我板子上用了一个ads7223,1MHz采样速率。
pcb的布局参考了手册,模拟地和数字地是分开的
当我观察模拟输入的时候,发现模拟输入信号上有一个1Mhz的干扰,我怀疑是convst信号。
我修改fpga的驱动代码,将convst信号移走,保持其他信号不变(包括20MHz的adc时钟),然后发现模拟输入信号上面的干扰就消失了

请问如何解决?