82583V Datasheet, PDF (369/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

Board Layout and Schematic Checklists—82583V GbE Controller
Section
10/100/1000
Base-T Interface
Magnetic Module
(Integrated
Option)
10/100/
1000Base-T
Interface
Magnetics Module
(Discrete Option
with
RJ-45 Connector)
10/100/
1000Base-T
Interface
Chassis Ground
Check Items
Qualify magnetic modules carefully for return
loss, insertion loss, open circuit inductance,
common mode rejection, and crosstalk
isolation.
Supply 1.9 V dc to the transformer center taps
and use 0.01 μF bypass capacitors. If a LAN
switch is used or the trace length from the
82583V is greater than four inches, it might
be necessary to boost the voltage at the
center tap with a separate external power
supply to optimize MDI performance.
Ensure there are no termination resistors in
the path between the 82583V and the
magnetic module.
Bob Smith termination: use 4 x 75 Ω resistors
connected to each cable-side center tap.
Bob Smith termination: use an EFT capacitor
attached to the chassis ground. Suggested
values are 1500 pF/2 KV or 1000 pF/3 KV.
Supply 1.9 V dc to the system side
transformer center taps and use 0.01 μF
bypass capacitors. If a LAN switch is used or
the trace length from the 82583V is greater
than four inches. It might be necessary to
boost the voltage at the center tap with a
separate power supply to optimize MDI
performance.
Ensure there is high voltage isolation to line
side of the MDI traces and the Bob Smith
termination.
Ensure there are no termination resistors in
the path between the 82583V and the
magnetics.
Provide a separate chassis ground to connect
the shroud of the RJ-45 connector and to
terminate the line side of the magnetic
module.
Place pads for approximately 4-6 stitching
capacitors to bridge the gap from chassis
ground to signal ground.
Remarks
A magnetics module is critical to passing IEEE PHY
conformance tests and EMI test.
1.9 V dc at the center tap biases the 82583V's output
buffers. Capacitors with low ESR should be used.
The 82583V has an internal termination network.
Terminate pair-to-pair common mode impedance of the
CAT5 cable.
These capacitors provide high voltage isolation.
1.9 V dc at the center tap biases the 82583V's output
buffers. Capacitors with low ESR should be used.
The Bob Smith termination and the MDI traces should
be >= 80 mils away from all components and traces on
the same layer.
Do not use less than 10 mils of single ply woven epoxy
(FR-4). There can be small air pockets between woven
fibers. Use thicker, two ply, or three ply epoxy (FR-4).
The 82583V has an internal termination network.
This design improves EMI behavior.
Typical values range from 0.1 μF to 4.7 μF. The correct
value should be determined experimentally to improve
EMI. Past experiments have shown they are not
required in some designs.
369