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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> Reply-To: "fred bartoli" <fred.bartoli_nospaaampleaase@remove.free.fr> From: "fred bartoli" <toto@hotmail.toto> Newsgroups: sci.electronics.design References: <5Q1H9.32847$zX3.76102@news.indigo.ie> <asife6$71l$1@news5.svr.pol.co.uk> <3deecffa.5608288@news.texas.net> <asik0p$1k8$1@newsg2.svr.pol.co.uk> <3df1ec26.12821553@news.texas.net> <PApH9.37691$vM1.2952231@bgtnsc04-news.ops.worldnet.att.net> Subject: Re: 100Hz from 25.6kHz crystal. Date: Wed, 4 Dec 2002 17:35:38 +0100 X-Newsreader: Microsoft Outlook Express 5.00.2314.1300 Message-ID: <3dee2e2b$0$22998$626a54ce@news.free.fr> Organization: Guest of ProXad - France NNTP-Posting-Date: 04 Dec 2002 17:32:43 MET NNTP-Posting-Host: 62.106.186.80 Marc H.Popek <LVMarc@worldnet.att.net> a écrit dans le message : PApH9.37691$vM1.2952231@bgtnsc04-news.ops.worldnet.att.net... > Hey wait a minute. If you needed to divide these clocks down to say 1 Hz. > the 4 MHz crystal would provide a stability gain of about 100 since the > crystal is basically a 30 PPM crystal at 4 MHz and when you divide the error > divides as well, so both these crystal divided down to a common reference > then the 4 MHz crystal will be way better! > The answer is obvioulsy no. Think about it again John. The frequency accuracy (frequency error/frequency) will remain exactly the same, before and after the divider. Fred. > Marc > "John Fields" <jfields@texas.net> wrote in message > news:3df1ec26.12821553@news.texas.net... > > On Tue, 3 Dec 2002 16:05:03 -0000, "John Jardine" > > <john@jjdesigns.fsnet.co.uk> wrote: > > > > > > >Yes ... The watch crystals keep 'customer acceptable' good time. > > >Xtal wise, the watch manufacturers are limited in what they can choose to > > >use and this is set by the power required by the xtal oscillator circuit > and > > >the following binary divider chains needed to get down to 1HZ. This > results > > >in the 32768Hz compromise. > > >Compare this 32768Hz timekeeping, against that of the clock in your auto, > > >where the designers didn't have to worry about power consumption. > > >The vehicle clock will invariably be fitted with a higher frequency 4Mhz > > >xtal. This xtal is naturally much more stable over time and temperature > and > > >results in about 10X better timekeeping!. > > --- > > I've got the data sheets for an Epson C-2 type 32768Hz and an Epson > > CA-310 4MHz crystal in front of me and here are some interesting > > spec's: > > > > TYPE FREQ TOL TEMPCO AGING SHOCK > > C-2 20ppm -0.04ppm/°C² 5ppm/yr 5ppm > > CA-310 30ppm +/- 0.714ppm/°C 5ppm/yr 10ppm > > > > In the tempco column, the C-2 data is exactly as taken from their > > data sheet, while the CA-310 is represented as +/-50ppm over the > > range of -10 to 60°C. on their data sheet. I don't really > > understand the notation for the C-2 tempco and that's the only > > reference they make to it on the data sheet, but if it really _is_ > > 0.04ppm, then it seems the C-2 is clearly a better crystal at > > 32768Hz than the CA-310 is at 4MHz! Here's Epson's URL for > > crystals: > > > http://www.eea.epson.com/go/Prod_Admin/Categories/EEA/QD/Crystals/mhzThruhol > e_Crystals/displayItem?itemId=CA-301&categoryId=EEA.QD.Crystals.mhzThruhole_ > Crystals > > > > > > John Fields > > Professional circuit designer > > http://www.austininstruments.com > > > > > > </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>