That just confirms that they are clueless when it comes to accurately measuring additive PN.
To get the real additive PN one would have to measure it for oneself. If I had a suitable PCB board for it I would do the measurement properly. Bruce > > On 04 March 2018 at 23:59 Leo Bodnar <l...@leobodnar.com> wrote: > > Not sure how calculated this - the PN chart for PL133-37 shows output > jitter barely lifting off the input jitter trace. LT do not say what their > input jitter is. > > Additive jitter for 100MHz 12kHz-20MHz is 80fs for PLL133-37 and 90fs for > LTC6957 at more than 10 times lower price. > > I would trust LT more but all this is still armchair engineering. The > only way to know is stick it on the board and check. > > Note that PLL133-37 is AC coupled internally so not suitable for short > sharp spikes or low frequencies. > > Cheers > Leo > > On 4 Mar 2018, at 10:20, Bruce Griffiths wrote: > > > > > > Somewhat worse than an LTC6957 particularly at low offset > > frequencies. > > > > Either that or the manufacturers PN noise measurement method > > doesn't work well at low offsets. > > > > Bruce > > > > On 04 March 2018 at 22:34 Leo Bodnar <l...@leobodnar.com> wrote: > > > > Ulf, > > > > What level of jitter would you consider acceptable? > > > > Try PL133-37, I am using it for sinewave shaping on some of designs > > - including my 30ps pulser. > > > > Leo > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
