AN983 datasheet(91/91 Pages) ETC

91 / 91 page

AN983B

PCI/miPCI Fast Ethernet Controller with integrated PHY

ADMtek Inc.

www.admtek.com.tw

Rev. 1.8

4). For EMI consideration, please add 0.1uF caps between system GND and chassis GND.

4). Provide sample power and ground planes

GND plane

1). It is a good idea to fill in unused areas of the signal planes with solid copper

2). The signal ground region should be one continuous, unbroken plane extending from the

transformer through the rest of the board.

3). On right angle is recommend when partition the Vcc and GND plane.

5). Void the power and ground plane directly under the transformer.

6). The isolation voltage of the transformer should be rated to be greater than 2kv.

7). The sample board Vcc and GND plane at below side.

AN983B

VCC FROM PCI

Power

Trace

Power

Switch

Power

PLANE

Power

Switch

Not Suggestted

Good

RJ45

Transformer

VCC PLANE

UNDER

CHIP

Chassis

Ground

System

Ground

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