Hello,
I would like to use LMX2594 as part of a downconverter for a phase noise analyzer.
It is important that the output has uncorrrelated noise.
Using two LMX2594EVM (locked to a low noise signal source) and a phase noise analyzer in addiive phase noise mode, I noticed spurs at -130 dBc/-140 dBc between 1 khz and 10 khz (around 10 spurs) at 200 MHz carrier. Note that theae spurs are normally invisibile, I can see them thanks to correlation noise improvement.
These spurs are always there, independently if in imteger mode or fractional mode, changing power suppy did not change their location.
My question: inside LMX2594 there is a digital core always running, even when spi and sysref are disabled? Is it possible to switch it off?
