Ah, right you are. For some reason I got it into my head that the grounds
would have to meet at the board, but you're right, the star point should
stay back at the supply. Thanks.
--Adam
> -----Original Message-----
> From: Mark [mailto:yahoogroups@...]
> Sent: Thursday, October 26, 2006 3:50 PM
> To: Adam Schabtach; 'MOTM litserv'
> Subject: Re: [motm] MOTM 6-pin power connector ettiquette question
>
>
> If the header has a separate "digital" ground for the 5V
> source, then I don't see any reason to connect them on the
> PCB. The "star point"
> is at the power supply. Many mixed-signal systems have
> analog and digital grounds separated in this way, with the
> ground pins of the AD and DA converters connected to the
> analog system ground. Putting a ferrite bead or resistor
> between the grounds will create an impedance.
>
> On 10/26/06, Adam Schabtach put forth:
> >Question for Paul, mostly, but maybe others have considered
> the same thing:
> >If I'm building a module from scratch, and I want it to play nicely
> >with my MOTM modules (present and future), and it's drawing
> all three
> >voltages through a MOTM-standard 6-pin power connector, and it's a
> >hybrid analog/digital module, how do I connect together the digital
> >ground and the analog ground on my PC board? It may be
> something of a
> >moot point because AFAICT my Power-One triple supply has the grounds
> >connected together anyway, but I'm wondering whether there is some
> >little nicety that I should observe, like maybe using a
> ferrite bead instead of just plain copper.
> >
> >Thanks for any opinions or suggestions.
>
>
>
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