Hi Peter, most of dspic 30F have an 7,37MHz internal oscillator that can do
what you want without the need of an external oscillator. Of course the
maximal teorical speed would be acomplished with an 7,5MHz. 118,7 compared
to 120 is not a big difference with normal applications.

2009/10/17 Peter Restall <pete@restall.net>

>
> > HOWEVER, on pages 156 and 157, there are two tables that list the minimum
> and
> > maximum ranges for the PLL inputs as 4-10MHz; with a 10MHz clock you
> would
> > either end up with 160MHz (x16 PLL - and exceeding specs), or 80MHz (x8
> PLL -
> > but only 2/3 of the maximum possible).
>
> The oscillator datasheet for the dsPIC30F family (DS70054E) actually backs
> this up, so I guess I need a 7.5MHz crystal.  Shame I didn't go for one of
> the dsPICs that have an (HS / 2) * PLL mode, then I could've just used one
> of the abundance of 15MHz crystals I have.  C'est la vie.
>
> Cheers,
>
> Pete Restall
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