[SI-LIST] Re: Connect SGND and PGND on Digital DC/DC Converter?
- From: Jory McKinley <jory_mckinley@xxxxxxxxx>
- To: Tomas Carlsson <tomas.l.carlsson@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 12 Dec 2011 07:35:58 -0800 (PST)
Hello Tomas,
Should be fine since the spec calls for:
â?¢ Establish a continuous ground plane connecting SGND (pin 9),Â
PGND (pin 10), and PGND (pin 16).
Stitch near the components cavity below 1/4 wavelength distant of highest
energy content. Â Also, make sure to keep signal references to appropriate
ground plane, this will minimize the amount of expected ground noise.
Regards,
-Jory
________________________________
From: Tomas Carlsson <tomas.l.carlsson@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Monday, December 12, 2011 9:02 AM
Subject: [SI-LIST] Connect SGND and PGND on Digital DC/DC Converter?
Hello,
This is a question on the popular topic whether to stitch different grounds
(analog / digital / power) together or not.
I am looking in the datasheet and app notes for a couple of Digital DC/DC
Converter Modules (17A or 6A):
http://www.intersil.com/data/fn/fn7914.pdf
http://www.intersil.com/data/fn/fn6852.pdf
It is recommended to connect the analog/signal ground (SGND) island to the
power ground (PGND) in *one place only*.
I have a 12 layer stack-up with 4-5 ground planes. I plan to stitch all
ground points (regardless SGND / PGND / DGND) together through vias close
to each ground pad to avoid creating plane cuts. This will in effect stitch
SGND to PGND and make the design simpler. What are your thoughts on this?
Is it a good or bad idea to make the entire DC/DC module see the same
ground?
Thanks,
Tomas Carlsson
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