Hi, I am Ken.
I have a question about using ADF4351. The test parameters of using ADF4351 Evaluation board software are shown in the attachment.
I use a 26MHz clock as reference clock and double it in my setting so the PFD frequency is 52MHz.
Based on this settings, the band select clock is around 204kHz and the software interface warns that it cannot be higher than 125kHz.
But according to the datasheet, it states that the band select clock frequency can be up to 500kHz when the DB23 of R3 is set to high.