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CDCE62005的两个VCO振荡频率为什么不连续?

Other Parts Discussed in Thread: CDCE62005

我买了TI 的DAC34H84EVM开发板,板上有一片CDCE62005的时钟芯片,但是对输入频率VCO锁定范围很窄,还不到1M,VCO的两个range居然不连续。我想用原子钟给62005做时钟参考,是10Mz的信号,但是分频比怎么调都不能锁定。默认的那组配置,25MHz虽然能锁定,但是low range只有24.6MHz~25.6MHz时锁定,high range在28.7MHz~29.9MHz时锁定,VCO不交叠,锁定范围也很窄,这样对吗?