PLL operating range

well i guess the answer is there's no other way to do it. it's a pity as assuming 20MHz safe range from nominal frequency it would mean that we need to have at least 8 different settings to span up to 165 MHz. lock time is normal however to this we need to add the time required to reconfigure the PLL and add a reference clock to our system (although i agree that in most system you do have a reference clock anyway).