> Possibly you mean the CVS575 datasheet does not have any aging specs.... The > datasheet for the CVHD-950 specifies aging as "<3ppm 1st/yr, <1ppm > thereafter" which is good enough for me. So it's now on the shopping list.
No, what I meant was that the data sheets didn't have any total lifetime specs. If the aging is 1 ppm per year and the APR says 50 ppm, how many years does that cover? Suppose they used 10 years. If you are designing for 20 years then you have to subtract another 10 years of aging so you only get an APR of 40 ppm. Hopefully, their APR spec covers an infinite lifetime. If so, there is a hidden spec, something like aging gets lower with age so the tail after 10 years is lost in the noise of other stuff. But I didn't find any hints like that in any of the app-notes I looked at. (and I'm a suspicious old-fart, aka nit-picker when reading data sheets) -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ 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.
