ADF4158锁定指示问题

我按照评估板软件设置给的寄存器对4158进行配置后,将muxout设置为DVDD,DGND,N-DIVIDER OUTPUT时用频谱仪观察输出频谱,发现是锁定的;但是一但将muxout设置为DIGITAL LOCK DETECT和R-DIVIDER OUTPUT时器件工作异常,输出频点为VCO默认频点,请问有哪些可能性?时钟参考和VCO输出正常。

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