ADF4150 question


            Customer use reference clock is 40MHz and output 122.88MHz. The phase noise specification as below. If use ADF4150 for simulation, below are customer questions, 

1. Phase detector output is present on abnormal condition when we set the PDF value is less than 25kHz.

As you knew that PDF should be set to 20kHz for fvco 122.88MHz. Please kindly share us what is the

Phase detector frequency range ?  

In addition ,Could you share your experience. What ‘s loop bandwidth min you could accept ?

        The purpose is to get the good PN , If we set bandwidth is lower than 1kHz what will happen ?

2. If use LTC6950,  please help to check this synthesizer is possible for customer requirement ?