PLL filter values

Started by Jordi Costa September 16, 2003

We are making a development using HCS12 and evaluation board MM68KIT912DP256. Oscillator is 16 MHz external and clock frequency is set to 50 MHz. Now we are going to design our own board and set PLL filter values. C13 and C14 capacitor values are not shown in evaluation board schematics while R2 is 4K7. Anybody knows that values or a good choice for Cs and Cp ?

Regards,

Jordi Costa




Hi.

Posted a while ago in the 68hc12 list:

A PLL components calculator program for the HCS12 is available on the Nohau
web site at:
http://www.nohau.com/s12calc/pll_302.html

Regards,
Gilles

At 11:14 AM 9/16/2003, you wrote:

We are making a development using HCS12 and evaluation board
MM68KIT912DP256. Oscillator is 16 MHz external and clock frequency is set
to 50 MHz. Now we are going to design our own board and set PLL filter
values. C13 and C14 capacitor values are not shown in evaluation board
schematics while R2 is 4K7. Anybody knows that values or a good choice for
Cs and Cp ?

Regards,

Jordi Costa --------------------
">http://docs.yahoo.com/info/terms/


Gilles,

Downloaded and successfully used. Thank you very much,

Jordi

----- Original Message -----
From: "Gilles Blanquin" <>
To: <>
Sent: Tuesday, September 16, 2003 11:33 AM
Subject: Re: [68HC12] PLL filter values > Hi.
>
> Posted a while ago in the 68hc12 list:
>
> A PLL components calculator program for the HCS12 is available on the
Nohau
> web site at:
> http://www.nohau.com/s12calc/pll_302.html
>
> Regards,
> Gilles
>

> At 11:14 AM 9/16/2003, you wrote:
>
> We are making a development using HCS12 and evaluation board
> MM68KIT912DP256. Oscillator is 16 MHz external and clock frequency is set
> to 50 MHz. Now we are going to design our own board and set PLL filter
> values. C13 and C14 capacitor values are not shown in evaluation board
> schematics while R2 is 4K7. Anybody knows that values or a good choice for
> Cs and Cp ?
>
> Regards,
>
> Jordi Costa >
> ">http://docs.yahoo.com/info/terms/