Lpc2000

I wonder if anyone can offer opinions on these programmable oscillators.
The LTC6903 and LTC6904 are oscillators programmable from 1kHz - 68Mhz.
One is programmed via I2C the other via SPI.

http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1010,C1096,P2415
http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1010,C1096,P2416

Does anyone know if these are suitable for use with microcontrollers as
their main clock source? They are probably too expensive for products
but they look very useful for prototyping. I'm playing with a half dozen
different ARM chips with varying clock rates, so it would be convenient
if one oscillator could work with all of them.

Any opinions or comments?

Thanks,
Doug

I would check the specs for the PLL on the micro and compare to the 
jitter specs on the oscillator. Potentially the PLL on the micro 
could loose lock due to changes in whatever environmental 
instabilities the osc may have.  But after all that, I have used 
similar osc from Linear with good results.

Ian

--- In lpc2000@yahoogroups.com, "octofroggy" <scanlon.design@n...> 
wrote:
>
> I would check the specs for the PLL on the micro and compare to the 
> jitter specs on the oscillator. Potentially the PLL on the micro 
> could loose lock due to changes in whatever environmental 
> instabilities the osc may have.  But after all that, I have used 
> similar osc from Linear with good results.
> 
> Ian
>


From Linear product summary:  
Jitter <0.4% Typical 1kHz to 8MHz

Hi Doug

I really like these LTC parts.
I allready used them in a Frequency Generator project.
As a clock source they are over qualified but it will work.

Cheers
Michael OE1MIS

>From: Doug Sutherland <doug@...>
>Reply-To: lpc2000@yahoogroups.com
>To: lpc2000@yahoogroups.com
>Subject: [lpc2000] Programmable Oscillators
>Date: Tue, 06 Dec 2005 11:31:57 -0500
>
>I wonder if anyone can offer opinions on these programmable oscillators.
>The LTC6903 and LTC6904 are oscillators programmable from 1kHz - 68Mhz.
>One is programmed via I2C the other via SPI.
>
>http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1010,C1096,P2415
>http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1010,C1096,P2416
>
>Does anyone know if these are suitable for use with microcontrollers as
>their main clock source? They are probably too expensive for products
>but they look very useful for prototyping. I'm playing with a half dozen
>different ARM chips with varying clock rates, so it would be convenient
>if one oscillator could work with all of them.
>
>Any opinions or comments?
>
>Thanks,
>Doug
>
>