nRF9160 LFXO accuracy over temperature

Question

Hi, 
 in Product Specification document of nRF9160 Product Specification 
 I found that accuracy of LFXO is +/-20ppm 
 is this accuracy valid for all the temperature range -40° to +80°C ? 
 or will-it vary somehow?

Martin Sivertsen · Accepted Answer

Hello Catalina, 
 Here are the specifications of a crystal that is of the same kind that is inside the nRF9160 System in Package. 
 We can see that the frequency tolerance is valid within 25±3°C, outside of that temperature range we can apply the temperature coefficient and get a parabolic curve that shows the deviation in ppm. 
 Take a look at this paper to see how it is applied. 
 Best regards, 
 Martin S.

nRF9160 LFXO accuracy over temperature

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