We are using a 10 MHz frequency reference from a GPS on the ADRF6720. It looks like our output frequency randomly shifts by about +/-1.25 Hz around the desired frequency. Is this normal, and is there some setting that could limit these frequency changes? I'm attaching a histogram of the frequency output in Hz on the X-axis. Note: the 384 Hz offset is just because of our collection system being off in frequency. I'm concerned about the bi-model random change in frequency (which we know is NOT from our collection system).