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I need a crystal for my project and I found this crystal: https://mouser.com/ProductDetail/TXC-Corporation/9C-16000MAAJ-T?qs=sGAEpiMZZMsBj6bBr9Q9aWUu9Vmt5DeozjX1gZsyHq8%3D

To calculate the two capacitances for the crystal i used this equation: CL = (C1 * C2) / (C1 + C2) + Cstray

But the datasheet only giving Cshunt. Is it the same as Cstray? After calculating with Cshunt for Cstray I come to a value of 22pF.

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The stray capacitance is the parasitic capacitance present on the pcb board (due to proximity to components) plus the capacitance of the pins. As a rule of thumb, a value for Cstray is on the order of ~5pF.

The shunt capacitance is another parameter and it's mainly a concern for the internal oscillator circuit.

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  • \$\begingroup\$ thanks! So after calculate again it needs to be 26 pF. But i am using the atmega16 and the capacitors needs to be inbetween 12-22 pF. So is 22 the best option i think? \$\endgroup\$
    – digitsboy
    Mar 30 '18 at 1:35

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