Re: tiny inductor with every bypass cap?

On Jun 22, 5:15=A0pm, qrk <SpamT...@[EMAIL PROTECTED]
> wrote:
> On Sat, 21 Jun 2008 16:06:02 GMT, "Talal Itani" <tit...@[EMAIL PROTECTED]
>
> wrote:
>
> >Hello,
>
> >I was looking at the schematics for a DSP-based board, running at 100
MH=
z.
> >They have a tiny inductor with every bypass cap around the DSP. =A0Do
yo=
u
> >think this is necessary? =A0This DSP has analog stuff built-in. =A0If
we=
 do not
> >need analog, can the inductors be eliminated?
>
> >Thanks,
> >T.I.
>
> Seems a bit overkill. If there is a supply running a PLL circuit in
> the DSP, you'll need the bead on the PLL supply. Look at the
> manufacturer's data sheet. Often, they will recommend bypass capacitor
> issues.

The Texas Instruments application note for this part doesn't inspire
confidence. It might be worth looking at what other - more trustworth
- manufacturers recommend for comparable parts. I've had a couple of
bad experiences with Texas Instruments and really don't trust their
customer sup****t, but even the best of companies - Analog Devices come
to mind  - aren't infallible.

--
Bill Sloman, Nijmegen