Rset Placement; Recommended Gmch Dac Components - Intel 855GME Design Manual

®
Intel 855GME Chipset and Intel
Integrated Graphics Display Port
The DAC channel (red, green, blue) outputs are routed as single-ended shielded current output
routes that are terminated prior to connecting to the video PI-filter and VGA connector.
presents the recommended GMCH DAC components.
Table 43. Recommended GMCH DAC Components
Component
R1
Rset
C1
C2
C
D
FB
Figure 76
Figure 76. Rset Placement
REFSET ball
Resistor
Solder
Pads
156
®
6300ESB ICH Embedded Platform Design Guide
Recommended DAC Board Components
Value
75.0 Ω
128.0 Ω
0.1 µF
0.01 µF
3.3 pF
PAC DN006
75 Ω @ 100 MHz
depicts the recommended Rset placement.
855GME
Chipset
Rset
Resistor
Tolerance Power
1 % 1/16 W
1 % 1/16 W
20 % -----
20 % -----
10 % -----
------- 350 mW
-------- -------
128Ω, 1%, 1/16W
SMT metal film
resistor
Top Side of
Motherboard
Large via or multiple
vias straight down to
ground plane
Table 43
Type
SMT, Metal Film
SMT, Metal Film
SMT, Ceramic
SMT, Ceramic
SMT, Ceramic
California Micro Devices – ESD diodes
for VGA
SOIC package
Or equivalent diode array
MuRata* BLM11B750S
Short, wide route
connecting the
resistor to the IREF
ball
No toggling signals
should be routed near this
reference resistor