[SI-LIST] AC97 Audio layout
- From: Joel Brown <joel@xxxxxxxxxx>
- To: SI-List <si-list@xxxxxxxxxxxxx>
- Date: Mon, 10 Jul 2006 11:09:12 -0700
We are working on a board layout that has an AC97 Audio IC (AD1981B)
Analog Devices recommends a split plane to separate analog and digital
ground.
Our EMI consultant advises us to avoid split planes even with mixed
analog and digital circuits and to bridge across the split with 0.1 uF
caps at 0.5" intervals if we do use a split plane. There are no digital
signals in the analog area. Is the purpose of the plane split to keep
general ground plane noise off the analog ground, or is it to keep the
AC97 digital signals going into the audio chip from getting onto the
analog ground?
Thanks - Joel
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