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CDCE72010时钟芯片编程

Other Parts Discussed in Thread: CDCE72010, LMK04828, LMK04826

我在使用CDCE72010时钟芯片时,使用外部参考时钟16MHz, VCXO选择中心频率为491.52MHz,我想要输出128MHz的时钟频率,所以我希望VCXO的输出频率可以通过PFD环路调节至512MHz。

我对相应除法器的设置如下:

Input reference: 16MHz
Reference divider: 1
M divider: 125
VCO: 491.52MHz
Feedback divider: 4
N divider: 1000

但是提示错误PLL不能锁定。请问原因是什么?怎么修改呢?