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锁相环LMX2430倍频有鉴相频率非整数倍的频偏

Other Parts Discussed in Thread: LMX2430

我用锁相环LMX2430倍频,鉴相频率是500KHz的时候输出频率有1.7MHz的偏差,我把鉴相频率调小之后发现频差也变小了(不清楚怎么回事)。而且虽然输出频率有偏差但是输出频率的步进是对的,等于鉴相频率。

对了,芯片PDF上的功能示意图把数字地和模拟地直接接在一起了,我的电路也是按照这个样子直接接到一起了,是不是因为这个接地问题呢,求指导一下呀