[SI-LIST] Re: Query about Oscillator problem
- From: Istvan Novak <istvan.novak@xxxxxxx>
- To: chundi srikanth <chundis@xxxxxxxxx>
- Date: Sat, 30 Jan 2010 12:14:39 -0500
Hi Sree,
A typical oscillator circuit will have two discrete capacitors going to
ground from either end of the crystal.
Those capacitors are critical: they should not change capacitance too
much over temperature. You may want to
check the temperature coefficient on those; NPO is preferred.
Regards,
Istvan Novak
SUN Microsystems
chundi srikanth wrote:
> Hi Friends,
> I have designed a board with MCF5212 Processor and it was interfaced to a
> Pericom (saronix-ecera) NKS5 series quartz crystal. The crystals operating
> temperature was -40Deg c to 85Deg c. Earlier i tested this board and
> everything was fine but now because the PLL was not locking and processor
> was working. So when i observed i noticed that at ambient temperature the
> crystal clock output was 2V p-p but with decrease in temperature the clock
> output was decreasing below 0.8V at -40 Deg c.
>
> Can you just give me an idea about this problem and what might be the
> problem in this scenario?
>
> Thanks & Regards
> Sree
>
>
>
>
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