Yes, you're right. Obviously I didn't know about this chip :-) It says there is an on-chip aging trim register. The DS3231 is in fact exactly the type of chip that I was after for my own clock! It has a programmable square wave output, need to check it out if I can get the frequency down to 100Hz, otherwise need external divider circuit.
Michel On Feb 23, 1:04 am, "Tidak Ada" <[email protected]> wrote: > Isn't it a TCXO is a Temperature Compensated X-tal Oscillator ? > > eric > > > > > > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > > Behalf Of Cobra007 > Sent: woensdag 22 februari 2012 12:08 > To: neonixie-l > Subject: [neonixie-l] Re: Dallas/Maxim TCXO question > > Apart from temperature influences on the crystal, the frequency and > stability also depend on what type of load capacitors you use. > > 1 second per day (99.999% accurate or 0.379Hz) is really not bad for an > RTCC, a very fine tuned one uses a trimming capacitor and runs about 1 > second per week. If you want to go more accurate than that, you will need to > compensate for temperature and other influences. > > Michel > > On Feb 22, 4:02 pm, "chuck richards" <[email protected]> wrote: > > I have a few questions about the Dallas/Maxim 32KHZN/DIP TCXO ics: > > > Has anyone out there in nixieland had much long-term experience with > > these? > > > The reason I ask is because I've been using them now for about ten > > years and have noticed a few things about them. > > > One thing I seem to notice is that they are not as accurate now as > > they were some years ago. I have one in a clock, and when new for the > > first few years it kept extremely accurate time. > > I kept well within 10 seconds per year then. > > More like +5 seconds in one year according to my old notes from actual > > running tests. > > > It runs now about 20 to 30 seconds fast per year. > > Might that be due to crystal aging? > > > And also, along the years I have gotten many batches of more free > > samples of these from Maxim. Some seem to be much more accurate than > > others. I just was testing one of them and it gains about one second > > in two days! > > > I also ran across power rail noise affecting the accuracy of one of > > them in a clock I made. That problem was partially solved by putting > > a .1 uF ceramic disc cap. across the power input pins to it, and then > > putting 100 ohms in the > > +5 volt feed to it. > > > In general, these do not seem as rock stable and accurate now as they > > once did. > > > Any ideas what might be going on? Anyone else been using them? > > > Thanks, > > > Chuck > > > $4.95/mo. National Dialup, Anti-Spam, Anti-Virus, 5mb personal web space. > 5x faster dialup for only $9.95/mo. No contracts, No fees, No Kidding! > Seehttp://www.All2Easy.netformore details! > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To post to this group, send an email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/neonixie-l?hl=en-GB. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
