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Topic: Arduino mega 2560 crystal oscillator (Read 2865 times) previous topic - next topic

Papa G


50 cents, you're overpaying.
http://www.digikey.com/product-detail/en/ATS16B/CTX1085-ND/2640031
35 cents, with proper software can see as little as 1 second drift per day.


Give an example. You could calibrate out the +- 30ppm frequency deviation in software but how would you propose dealing with the +- 50ppm stability with temperature?

retrolefty



50 cents, you're overpaying.
http://www.digikey.com/product-detail/en/ATS16B/CTX1085-ND/2640031
35 cents, with proper software can see as little as 1 second drift per day.


Give an example. You could calibrate out the +- 30ppm frequency deviation in software but how would you propose dealing with the +- 50ppm stability with temperature?


In ham radio equipment they often use a small adjustable variable trimmer cap in place of one of the fixed padding caps to fine tune the resonance frequency of the crystal +/- a few KHz, but that wouldn't have any improvement for the tempo stability variation of the crystal, that you live with or control the environmental temperature of the crystal.

Lefty

Papa G




50 cents, you're overpaying.
http://www.digikey.com/product-detail/en/ATS16B/CTX1085-ND/2640031
35 cents, with proper software can see as little as 1 second drift per day.


Give an example. You could calibrate out the +- 30ppm frequency deviation in software but how would you propose dealing with the +- 50ppm stability with temperature?

Yeah, I'm familiar with those kinds of hardware solutions but I was wondering how CrossRoads proposed doing it in software.
In ham radio equipment they often use a small adjustable variable trimmer cap in place of one of the fixed padding caps to fine tune the resonance frequency of the crystal +/- a few KHz, but that wouldn't have any improvement for the tempo stability variation of the crystal, that you live with or control the environmental temperature of the crystal.

Lefty

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