I found the ADC clock frequency information of ADF4355 in datasheet as shown below.
So, I estimated ADC clock as below.
ADC clock = PFD frequency / ADC_CLK_DIV = 61.44 MHz / 154 = 398.961KHz
But, my estimated ADC clock differ from the example ADC clock frequency of datasheet.
How do I estimate the ADC clock frequency ?