Product specifications

Design Guide - VT82C694X Apollo Pro133 with VT82C686A
Preliminary Revision 0.5, November 19, 1999 Appendix B - Audio Codec and Game/MIDI Port Layout
Guidelines
107
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Table B-5 and Table B-6 show the layout guideline summary for signal and power/ground nets respectively in the reference
schematic.
Table B-5. Routing Guidelines for Signal Nets
Net Name Routing Guidelines Note
SYNC, SDIN,
SDOUT, -ACRST
Maintain 8 mil trace width and 12 mil spacing 1
BITCLK Maintain at least 10 mil trace width and 20 mil spacing 1
PC_BEEP, ID1,
ID0, EAPD
Maintain 8 mil trace width and 12 mil spacing 1
XTLI, XTIO Maintain 15 mil trace width and 20 mil spacing 1
CDL, CDR Maintain 8 mil trace width and 12 mil spacing 1
CDGND Maintain 20 mil trace width and 20 mil spacing 1
MICIN Maintain 10 mil trace width and 20 mil spacing 1
LINE_L, LINE_R Maintain 8 mil trace width and 12 mil spacing 1
AFILT1, AFILT2,
VREF, VREFOUT
Maintain 10 mil trace width and 20 mil spacing 1
LINEOUTL,
LINEOUTR
Maintain 10 mil trace width and 20 mil spacing all the way through audio amplifier to
LINE_OUT jack.
1
Note: Wherever possible, keep the spacing as wide as possible for all signals.
Table B-6. Routing Guidelines for Power and Ground Nets
Net Name Routing Guidelines Note
AVCC5 Maintain small power island (plane) or short and wide (as wide as possible) trace to
ferrite bead L5 before providing power to AVDD5
1
AVDD5 Maintain small power island (plane) or short and wide (as wide as possible) trace to
pins AVDD1 and AVDD2 of VT1611A
1
DVDD5 Maintain small power island (plane) or short and wide (as wide as possible) trace to
pins DVDD1 and DVDD2 of VT1611A
1
AVDD Maintain small power island (plane) or short and wide (as wide as possible) trace to
pin VAA of TPA122 audio amplifier
1
GND_AUD, GND_LOUT,
GND_MIDI
Maintain 20 mil trace width on the component layer through a ferrite bead and then
multiple vias to digital ground
2
Notes:
1. Refer to power planes A, B, C and D in Figure B-5 and Figure B-6 for AVCC5, AVDD5, DVDD5 and AVDD respectively.
2. Refer to analog ground planes in Figure 3 for GND_AUD, GND_LOUT and GND_MIDI and ground plane E for GND_LOUT
in Figure B-5 and Figure B-6.