[SI-LIST] Re: Crystal datasheet!!
- From: "Andrew Ingraham" <a.ingraham@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 25 Nov 2004 11:03:20 -0500
> 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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