[SI-LIST] Re: Query about Oscillator problem
- From: steve weir <weirsi@xxxxxxxxxx>
- To: chundi srikanth <chundis@xxxxxxxxx>
- Date: Sat, 30 Jan 2010 08:50:34 -0800
Things you can check:
Board level power supplies are operating properly at low temp.
Processor Xtal amplifier gain is still adequate at low temp.
Condensation is not loading the crystal at low temp.
Capacitive loading on the crystal is correct at your low temp cut-out.
Steve.
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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--
Steve Weir
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