Find some high stability RTC.

 

Hi,all
   I am with a design which need very high frequency stabality RTC(real
time clock). 0.8ppm with temprature range from -40C --85C. I only
found the maxim's ds3221 with 3.5ppm from -40C --85C. Any suggestion?
thx

 

On 28 May 2005 22:27:04 -0700, in sci.electronics.design


Not quite what you want, but
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=35006&item=7518769387&rd=1



martin

"Wales is a big welsh-shaped rain collection device"

 

Un bel giorno WGNoise@gmail.com digitò:


0.8 ppm in -40/+85 look *very* hard to achieve. You don't have to care
about the RTC, you need a very stable TCXO, or a OCXO.

--
asd

 


"WGNoise@gmail.com" wrote:


Use an ovened crystal ? This was always the choice for frequency accuracy
of old. Does anyone still do them ?

Just looked. IQD certainly did in 1995 ( old data book ). Offered up to
0.25ppm freq stability.

Graham

 

On Sun, 29 May 2005 11:25:39 +0100, Pooh Bear


GPS derived? Internet time server? Radio controlled clock..
Even 50 Hz (60Hz?) controlled clocks should have good long term
stability.

--
 - René