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LMX2487的预分频器的数值怎么理解

Other Parts Discussed in Thread: LMX2487

LMX2487在讲寄存器R1时提到“RF_P”=0时预分频是16/17/20/21,“RF_P=1”时预分频是32/33/36/37,此时输出频率可以达到6000Mhz,

我想请教一下这个预分频32/33/36/37应该怎么理解,为什么是32/33/36/37就可以实现6Ghz呢,其他值就不行吗比如32/33/3435,这个原理咋理解