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DM9102DEP bảng dữ liệu(PDF) 65 Page - Davicom Semiconductor, Inc.

tên linh kiện DM9102DEP
Giải thích chi tiết về linh kiện  Single Chip Fast Ethernet NIC Controller
PDF  70 Pages
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nhà sản xuất  DAVICOM [Davicom Semiconductor, Inc.]
Trang chủ  http://www.davicom.com.tw
Logo DAVICOM - Davicom Semiconductor, Inc.

DM9102DEP bảng dữ liệu(HTML) 65 Page - Davicom Semiconductor, Inc.

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Final
65
Version: DM9102D-DS-F01
May 10, 2006
9.5 Ground Plane Layout
•
Place
a
single
ground
plane
approach
to
minimize EMI. Bad ground plane partitioning can
cause more EMI emissions that could make the
network interface card (NIC) not compliant with
specific FCC part 15 and CE regulations.
•
The ground plane must be separated into Analog
ground domain and Digital ground domain. The
line which connects the analog ground domain
and digital ground domain should be far away
from the AGND pins of DM9102D (see Figure
9-4-1).
•
All AGND pins (pin 100, 107, 108) could not
directly short each other (see Figure 9-4-3). It
must be directly connected to the analog ground
domain (see Figure 9-4-2).
•
The analog ground domain area is as large as
possible
Figure 9-4-1
Analog ground domain
Digital ground domain
AGND
AGND
AGND
Better
Analog ground domain
Digital ground domain
AGND
AGND
AGND
Worse! AGND direct short
Figure 9-4-2
Figure 9-4-3
25MHz
X'tal



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