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System Power Delivery Guide—Intel
Table 13.
Analog and Bandgap Filter Components
VCCARX, VCCATX, VCCAHPLL, VCCAUSB12,
VCCAPLL, VCCAPE0PLL12
VCCSATABG3P3, VCCABG3P3_USB, VCCABGP033
Note:
1.
6.6.5
Analog and Bandgap Filter Layout Guidelines
General board layout guidelines for the Analog filters are as follows:
• Ensure each listed supply has its own filter. Do not share filters between supplies.
• These supplies must have a via directly from the supply plane.
• The filter must be placed as close as possible to the EP80579.
• For filters that call out a distinct VSS, place the 0.1 uF capacitor as close as possible
to the filters power and ground pins, even though they are connected to the VSS
ground plane.
• Analog traces must be ground referenced.
• Minimum trace width of the analog signals is 12 mils.
• Minimum space to other signals is 20 mils
6.6.6
Analog and Bandgap Filter Frequency Response
The filters need to fall within the acceptable zone of the analog filter frequency
response shown in
®
Intel
EP80579 Integrated Processor Product Line
Order Number: 320068-005US
®
EP80579 Integrated Processor Product Line
Component
Analog Filter Components
VCC
R
1
L
C1
C2
Bandgap Filter Components
VCC
VCC3 (3.3V)
R
1
L
C1
C2
For the 4.7 uH filter inductors, select inductors
with maximum internal resistance of 0.2 ohm
and a current rating of 120mA (min). See
Table 14
for filter current rating requirements
Figure
48:
Value
V1P2 (1.2V)
0 Ω
4.7 µH
0.1 µF
10 µF
1 Ω
4.7 µH
0.1 µF
10 µF
May 2010
79
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