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Subject: Re: 32.7 Khz Crystal oscillator circuit help wanted
Date: Tue, 24 Sep 2002 11:10:14 +0100
NNTP-Posting-Date: 24 Sep 2002 10:10:14 GMT
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Thanks for the reply.
I need the power consumption and component count to be as low as possible.
The device you mention is too expensive for me.
Is there any other way that this clock can be generated?
"Allan Herriman" wrote in message
> On Tue, 24 Sep 2002 10:07:06 +0100, "MNQ"
> >Hi All
> >Im looking for a good website that will show me how to design a 32.7 Khz
> >oscillator. The circuit I have built oscillates at many MHz and I think
> >my resistor and cap. values being screwed up.
> >I am using an inverter from a CPLD if this helps.
> CPLD inverters aren't very good for making crystal oscillators. There
> have been some recent threads in news:comp.arch.fpga about why you
> shouldn't do this.
> >I have searched Yahoo, Google and Alltheweb.com but there are many pages
> >with nothing related to what I`m looking for. Can anybody recommend one?
> Unless you have a very cost sensitive application, I recommend using
> an oscillator package, such as this one:
> Second best would be to use a gate out of an *unbuffered* CMOS gate
> package to make an oscillator.
> ("best" = simplest to get working.)
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