Re: Low jitter oscillators - special frequencies

From: Marko (cantsay_at_here)
Date: 02/07/05 

Date: Sun, 06 Feb 2005 23:10:37 -0800

Depending upon the frequency you need, try Pletronics. Part of the
problem is that they aren't interested in selling a few dozen or even
a few hundred. They will provide samples at no cost if you can
convince them there is some possibility of larger volume. This is
assuming you are dealing with a reasonable frequency for them.

Also, if it is possible to taylor your design to some common
frequency, you should have more options. Check Digikey for some
common frequencies.

What frequency are you looking for and what are your jitter specs?

Marko

On Sun, 06 Feb 2005 17:53:46 -0600, hmurray@suespammers.org (Hal
Murray) wrote:

>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?