[email protected] said: > I am trying to build the most accurate fee running, low power time base I can.
> I am trying to beat existing products like the Dallas DS3231 and Micro > Crystal RV-8803-C7-32.768kHz-3PPM-TA-QC, which use (I think) a similar > strategy. Iâm hoping I can beat them by using more accurate temp tensing, > longer and more exhaustive calibration effort, and anything else possible! That should be easy. http://users.megapathdsl.net/~hmurray/time-nuts/Temp-tcxo32khz-a.png Do you need an accurate output frequency, or just know what the actual frequency is so you can compensate when counting cycles to keep track of elapsed time? I would start by bolting your setup to a large thermal mass and putting it inside an insulated box. Not too well insulated or it will cook itself. You want the thermal time constant to be long enough to give your control loop plenty of time to react. You also want the thermal sensor at the same temperature as the crystal. -- These are my opinions. I hate spam.
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