deicide@LIGHTSPEED.NET wrote:
>
> I need to generate 18.99 MHZ for a project I am currently working on.
> Its a reference frequency for a used controller board i got, and for the
> life of me I can't seem to find a way to do it.  What I would like is a
> PLL/VCO is one chip that will let me select the frequency via a binary
> input on 8 lines or so.  It has to be something small and inexpensive
> though.  PLEASE let me know if you can help  :)
> Gets a little frustrating after a while, when you get absolutely no
> results.

Take a look at National's CGS410 programmable clock generator. This
device implements the transfer function:

 f_out = f_in * N / (R * P)

where
1 < N < 16384
0 < R < 1024
0 < P < 17
and the maximum frequencies are:
 f_in < 35MHz
 f_out < 135MHz


The data sheet can be found at:
http://www.national.com/pf/CG/CGS410.html

It is programmed via a serial port. (and yes I'm using a PIC for that)

I'm using it to phase lock to the horizontal sync pulse of a
video signal. It works great!

Scott
--
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  I buy pizza instead of gas.    \<
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