W83971D Datasheet, PDF (57/58 Pages) Winbond – AC97 AUDIO CODEC

Preliminary W83971D
APPENDIX B: LAYOUT GUIDE
Vrefout
to via
270pF
NPO
10uF
To +5VA
0.1uF
To+5VA
0.1uF
AVss2
AFLT2
AVdd2
AFLT1
AVss1
VREF
AVdd1
To Analog
To Analog
Ground
Ground
Analog Ground
Pin1
DVss1
DVdd1
0.1uF
DVss2
To+5VD
To Digital Ground
0.1uF
DVdd2
To+5VD
* The above figure is the suggested layout for W83971D.
* The decoupling capacitors should be located physically as close to the pins as possible.
* The device should be located on a locally separate analog ground plane to keep noise
from the digital ground return currents from modulating the W83971D" ground potential and
degrading performance.
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Publication Release Date: July 1999
Revision A1