How can I calculate the maximum deviation of a quartz? This is from datasheet (12MHz):
Frequency Tolerance at +25° C => +- 30ppm
temperature tolerance -20°~ + 70°C => +-50ppm
aging (first year) => +- 2ppm
I want to calculate the maximum deviation for a specific period.
For example first quartz is at -20°C then the tolerance is 50 ppm or 50 ppm + 30 ppm? So +- 50 ppm or +-80ppm? The second quartz the same but it works at 70°C.
The following calculation is after one year so I add 2ppm. So when it is 82 ppm then the first quartz can operate at the worst case with 12MHz - 984 MHz and the second quartz is working with 12MHz+984MHz. Is this correct?
I am not sure because the frequency tolerance is at 25°C.