how to design loopfilter of adf4401a

Question

Hello, 
 I would like to ask you experts how to design the peripheral circuit parameters of the LT6200 for the loop filter of the ADF4401A? 
 Regards

ADIApproved · Accepted Answer

Hi, 
 We are currently working on the ADISIMPLL model for ADF4401A and it will be available in ADISIMPLL soon. 
 Regards, 
 Kudret

GlenBrisebois · Answer

Hi little_rabbit: I'm not sure what filter parameters you're looking for, nor what the ADF4401A wants to see. My favorite filter is the 3rd order Butterworth shown on the back page of the LTC6240 data sheet. That's a 150kHz (-3dB) filter, but the R's and/or C's can be scaled for other frequencies.