Low jitter oscillators - special frequencies

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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Hal Murray
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[from my message of a month ago - looking for non PLL oscialltors]

Thanks for all the comments and suggestions to roll my own...

I was looking for a half-size can because I wanted to change frequencies on an existing design with a socket.

If companies make to-order crystals, why don't they also make to-order oscillators? (maybe with slightly longer lead times) All they have to do is make the crystal and drop it into an osc package rather than a crystal package.

I got an email suggestion to:

They had what I needed in stock. Thanks.

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