Hello! I'm struggling to get the AD4351 to produce something with reduced reference spurs.
Here's the output from my specan Imgur: The magic of the Internet
It's set in integer-N mode, and it's got a 25 MHz crystal as a reference. Aux output disabled, 50 ohm match on A-, specan on A+. INT=100, r-counter=1, ref div=0, ref doubler=0. Changing the charge pump current doesn't seem to do much. Any idea what's up? I'd expect reference spurs to be at the level of -80 dBc.