On Thu, Aug 3, 2023 at 4:24 AM EVAN LAURANS <evan.laura...@imt-atlantique.fr> wrote:
> Hi all, > > I use the USRP X310 to analyze signal and i use the 10 MHz REF OUT for an > external device. I noticed that’s the REF OUT hasn’t a frequency of 10 MHz > when i am using a 184.32 MHz master clock rate but about 9.96 MHz, whereas > the REF OUT frequency is 10 MHz with a master clock rate of 200MHz. > Is there any way to have a REF OUT at the frequency of 10 MHz with a > master clock rate of 184.32 MHz ? > Probably not. The schematic has all these signals coming from an LMK04816 which is an integer-N PLL. Here is the clock control for the x300: https://github.com/EttusResearch/uhd/blob/master/host/lib/usrp/x300/x300_clock_ctrl.cpp#L655 Note that the VCO frequency is set to 2400 MHz when a 200 MHz master clock rate is set, but 2580.48 MHz for 184.32 MHz. You'll be limited to whatever that chip can provide. Brian
_______________________________________________ USRP-users mailing list -- usrp-users@lists.ettus.com To unsubscribe send an email to usrp-users-le...@lists.ettus.com
