[SI-LIST] Re: Crystal datasheet!!

> Is there any relationship between the Q factor and frequency tolerance
> of a crystal? Can I assume both to be the same quantity?

No.  As far as I know, there is no relationship whatsoever between Q and
frequency tolerance.

There probably is some relationship, because different crystal "cuts" do
exhibit both different temperature variation profiles, and different Q
factors as well.  However, I would not expect there to be any linear or
predictable relationship between Q and frequency tolerance.

Crystal frequency tolerance is a combination of a few factors, including the
initial frequency error (due to cutting tolerances or whatever), temperature
variations, aging, and shock.  I would expect that the crystal's type of cut
has a fairly strong effect on the temperature dependency, but probably not
much effect on the others.

Regards,
Andy


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