[SI-LIST] Fundamental vs Overtone crystal
- From: "Ayan Bhattacharyya" <ayan_bhattacharyya@xxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 11 Jul 2006 20:00:10 +0530
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Hi all,
I am using a TI DSP which needs 30 MHz crystal for clock. But =
as
this frequency is not quite popular in multiple manufacturers I have =
gone for
50 MHz crystal. Now at 50MHz there is no fundamental mode crystal =
available,
only overtone crystal. Can anyone tell me what will be the effects if a
overtoned crystal is used in place of a fundamental mode srystal.
The datasheet asks for=20
30MHz fundamental-parallel mode crystal usage with the=20
Load cap=3D12pF
Shunt cap=3D6pF
ESR=3D25-40Ohm
=20
How is the ESR important here....as far I know at lower freq (below =
50MHz)
the ESR can have some relaxation but at higher freq it's a crucial =
issue.
Regards
Ayan Bhattacharyya.
=20
=20
=20
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