Does ADRV9009 support external FM local oscillator input? If so, what is the locking time when passing through the PLL

hi all,

Can external input FMCW be used as local oscillator signal?I want to input FMCW signal, I wonder what the locking time of the PLL is after input. Is it related to the input FMCW frequency? FMCW frequency is 4GHz at most.