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Old 25th December 2003, 04:54 PM   #1
sugano is offline sugano  Hong Kong
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Default 100Mhz crystal

I am collecting the parts for Elso's async-clock and I am having a little trouble finding the 100Mhz crystal. Where can I buy one or can someone sell me one?

Thanks,
P. Sugano
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Old 25th December 2003, 05:35 PM   #2
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Default you can do it with a lower freq xtal

if you overdrive a xtal oscillator you generate a series of harmonics -- just use a bandpass filter at 100MHz for a crystal whose frequency is an integer dividend of 100 MHz. (This is how I used to operate 50Mhz (6 meters) ham transmission with an 8.333 MHz crystal.

or you can buy an XO for the frequency in question.

http://www.mfelectronics.com/products/xo/
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Old 26th December 2003, 01:13 AM   #3
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I have bought some off this place :

www.klove.nl

Not cheap though.

Regards,
Joe Ling
Malaysia
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Old 26th December 2003, 09:47 AM   #4
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Quote:
Originally posted by joeling39
I have bought some off this place :

www.klove.nl

Not cheap though.

Regards,
Joe Ling
Malaysia
They're probably made in your country and travelled to Holland and back again
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Old 26th December 2003, 12:17 PM   #5
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Default Re: 100Mhz crystal

Quote:
Originally posted by sugano
I am collecting the parts for Elso's async-clock and I am having a little trouble finding the 100Mhz crystal. Where can I buy one or can someone sell me one?

Thanks,
P. Sugano
The 100Mhz frequency is somewhat arbitrary, Kusonoki used a 50 MHz crystal, and Elso himself once said that any frequency > 45 Mhz could be suitable.

In my ASR I use a 80 MHz canned oscillator from a old server motherboard, but maybe I'll try different frequencies as I have several of them available.

Cheers

Andrea
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Old 26th December 2003, 05:26 PM   #6
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Default Re: you can do it with a lower freq xtal

or you can buy an XO for the frequency in question.

http://www.mfelectronics.com/products/xo/ [/B][/QUOTE]
----------------------------------------------------------------

Doing a serch for lowjitter XOs, one soon finds that the low jitter ones all hacve ECL or PECL outputs which appears lower than TTL.

What precisely are the differences?


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Old 26th December 2003, 06:31 PM   #7
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ECL does not saturate, so it is devoid of problems like ground bounce that saturated stuff has. It is always on, and so the output swing will always be a small fraction of the rail voltage.

Jocko
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Old 27th December 2003, 07:21 AM   #8
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[QUOTE]Originally posted by Jocko Homo
[B]ECL does not saturate, so it is devoid of problems like ground bounce that saturated stuff has. It is always on, and so the output swing will always be a small fraction of the rail voltage.

--------------------------------------------------------------------

Thanks Jocko; what then is comlementary PECL? And can these ECL and PECL chips be used directly in place of TTL for clockling transports and adc chips?

Pl explain also WE ARE DEVO
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Old 27th December 2003, 07:51 AM   #9
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Quote:
Pl explain also WE ARE DEVO
You never heard of DEVO ?!?!!? With Google it took me 1 sec.

http://www.freedomofchoice.com/devo/about.asp
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Old 27th December 2003, 01:50 PM   #10
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Default Re ECL

As good a place to start as any.

www.onsemi.com
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