I found application note AN-1381. Is this only applicable for the ADF4355-2? I am currently using the ADF5355, but only the lower band (up to 6.8 GHz). The faster lock time would really be useful for me. As the pinout are the same (except for RFoutB, which I do not use) I can easily replace it with ADF4355-3 (or ADF4355). The ADF4355-2 frequency is just too low for what I want.