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CL1 & CL2 Value for Crystal (HSE)

Question asked by eich.alexander on Feb 29, 2012
Latest reply on Mar 7, 2012 by eich.alexander
Hi,

I have chosen this 25Mhz Crystal to be my next HSE:
 
http://at.farnell.com/abracon/abm8g-25-000mhz-18-d2-t/crystal-25mhz-18pf-smd/dp/1788523#similarProducts

Datasheet: http://www.abracon.com/Resonators/ABM8G.pdf

How I calculate the HSE CL1 & CL2 Value? I remember to not take the 18pF Value from the Datasheet, there was a formular:

http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/CD00221665.pdf

so:
Cstray is 4 pF  (i dont know but its a common value)
CL is 18pF

so CL - CStray = 14pF

then CL1=CL2= 28pF

am I correct with that?

WR
Alex


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