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How can I measure XTAL precisely?

Question asked by Elastino on Nov 10, 2010
Latest reply on Nov 16, 2010 by mattp



For ADV7842, we use a XTAL.


I know there is a guide line of selecting capacitors for XTAL in datasheet.


However, I really want to confirm that my XTAL is configured to be 27MHz within 50ppm.


You know that typical measurement with oscilloscope will not show correct frequency due to effect of capacitance of the probe.


Some devices supports buffered out of XTAL for probing.


Is there any precision way to measure XTAL with ADV7842?


ie. Measuring clock with PRIM_STD=0xXX + Free-running, will indicates XTAL * 14 / 11 ......



Thank you in advance.