Re: Low jitter oscillators - special frequencies

From: Marc H.Popek (LVMarc_at_worldnet.att.net)
Date: 02/22/05 

Date: Tue, 22 Feb 2005 00:58:09 GMT

Hal,

Can can make you real xtal oscillator on any (reasonable) frequency you
choose) and free running oscillator for the unreasonable choices :-)

Marco
"Hal Murray" <hmurray@suespammers.org> wrote in message
news:v6mdnYh-ZKiXM5vfRVn-jQ@megapath.net...
> Most special order crystal oscillator packages now have a
> PLL in them. When you order a special frequency, they take
> an unprogrammed unit off the shelf and program in the PLL
> parameters. Delivery in a few days.
>
> The problem is that you get the jitter specs of the PLL rather than
> the crystal. The jitter turns out to be important for high speed A/D
> applications. It's probably important in most RF work too.
>
> Anybody know a good place to get real crystal oscillators made to order
> in small volumes? I need 10 or 20 but the first try came up with
> a min order of 250. I'm expecting 10-12 week delivery. I can live
> with that.
>
> Many crystal/oscillator companies used to be in the business
> of making small runs to a specified frequency. How many are
> left?
>
>
> Anybody familiar with the details of the PLL setup? I assume
> somebody did the math and figured out what frequencies they
> have to stock in order to cover all the target frequencies they
> might want to produce. How many different frequencies do they
> have to stock? What sort of ratios are they using in the PLL?
>
> When did everybody switch to PLLs?
>
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