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'18.99 MHZ clock'
1997\08\28@021941 by deicide

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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.

John
Student at Fresno City College

1997\08\28@081214 by RB

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Hi John

You might want to look at the MAXIM (MAX038) High Freq Function Generator.
It is capable of freq from 0.1 HZ to 20 Mhz. MAXIM web site is
http://www.maxim-ic.com. You can download spec sheets and they will also
sent you a free sample just for asking.

Hope this helps.                    Ron B

spam_OUTdeicideTakeThisOuTspamLIGHTSPEED.NET wrote:

{Quote hidden}

1997\08\28@111149 by Mike Keitz

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On Wed, 27 Aug 1997 23:03:04 -0700 .....deicideKILLspamspam@spam@LIGHTSPEED.NET writes:
>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.

If you only need one constant frequency, it is practical to order a
custom-ground quartz crystal.  This costs about $10.00 and 1 or 2 weeks
for delivery.  Though the cost may be slightly higher than some other
way, it is definitely a small, low power, and simple to design solution.
As for where to buy the crystal, I have had good results with ICM.  I
don't know if they're on the web or not but they should be at (800)
725-1426.

1997\08\28@133748 by sdattalo

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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
--
                                __o
 I buy pizza instead of gas.    \<
                             (*)/(*)

1997\08\28@143736 by Rick Sherman

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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.

Cypress makes a chip (ICD2053) that uses a 14.31818 xtal and will
generate
just about freq. between 360kHz and 120 MHz. Accuracy is about 100 ppm.
Cost
is in the $3 or $4 range. It has a serial input (about 22 bits).

The same chip is available from FOX (F6053A) combined with the xtal in a
std oscillator can (at about $20).

Rick Sherman KM6TI
rickspamKILLspamvcc.com

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