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LMK04808: PLL1不能正常锁定

Part Number: LMK04808

10M由授时时钟经单端转差分从clkin0口输入,61.44M是差分VCXO从OSCin输入,PLL1_R设定为125,PLL1_N设定为768,鉴相频率80KHz,CPout1通过一个2阶的低通接到了VCXO的VX管脚,10M的Vpp是600mV,61.44M的Vpp是360mV,目前板子上电以后PLL1有时候能锁定有时候不能锁定,请教各位大侠,这是什么原因?有什么解决办法?多谢