參數(shù)資料
型號： 84220
廠商： LSI Corporation
英文描述： Quad 100BaseTX/100BaseFX/10BaseT Physical Layer Device （Highly Integrated Ethernet Transceiver For Twisted Pair And Fiber Ethernet Applications）(四通道100BaseTX/100BaseFX/10BaseT 物理層處理器（高度集成的以太網(wǎng)雙絞線和光纖數(shù)據(jù)收發(fā)器）)
中文描述： 四100BaseTX/100BaseFX/10BaseT物理層裝置（高度集成的以太網(wǎng)收發(fā)器，雙絞線和光纖以太網(wǎng)的應(yīng)用）（四通道100BaseTX/100BaseFX/10BaseT物理層處理器（高度集成的以太網(wǎng)雙絞線和光纖數(shù)據(jù)收發(fā)器） ）
文件頁數(shù)： 48/92頁
文件大?。?/td> 1401K
代理商： 84220
48
MD400177/B
84220
4.0 APPLICATION INFORMATION
4.1 EXAMPLE SCHEMATICS
A typical example of the 84220 used for a switching hub
application in twisted pair mode is shown in Figure 12; an
example of the 84220 used in fiber mode is shown in
Figure 13.
4.2 TP INTERFACE
4.2.1 Transmit Interface
The interface between the TP outputs on TPOP/N and
the twisted pair cable is typically transformer coupled and
terminated with the two resistors as shown in Figure 12.
The transformer for the transmitter is recommended to
have a winding ratio of 1:1 with the center tap of the
primary winding tied to VDD, as shown in Figure 12. The
specifications for such a transformer are shown in Table
23. Sources for quad transformers compatible with the
84220 are listed in Table 24. Note that both “Stacked” and
“Non-Stacked pin out types are listed. The Stacked and
Non-Stacked designation refers to the type of RJ-45
connector used on the secondary side (line side) of the
transformer. The pinout of these types differ slightly so
that traces to the magnetics may be kept as short and
direct as possible.
The "non-stacked" RJ-45 (also referred to as harmonica)
is a traditional horizontally oriented connector consisting
of four RJ-45 jacks in a single in-line assembly.
The newer "stacked" connector consists of a two-over-two
configuration so that four RJ-45 jacks are located in the
footprint area of two side by side connectors. This is a
significant improvement for higher density multi-port
applications and smaller system form-factors.
The SEEQ 84220 pin-out has been optimized for
connection to transformers and connectors designed for
the higher density stacked configuration. The SEEQ
Quad Transceiver will also operate with non-stacked
connectors using either transformers that map the pin-out
to the non-stacked configuration, or by using trace
"crossovers" on the pc board layout.
The transformers listed with "non-stacked" pin-outs use
crossover connections inside the part to map the stacked
pin-out of the 84220 to non-stacked RJ-45 connectors.
Crossovers internal to the transformer are not made in a
controlled impedance environment, so this can impact,
somewhat, the cross-talk performance of the system.
For best cross-talk and system performance, it is
suggested that stacked connector and transformer
configurations be used. Alternately, non-stacked
connectors may be used with stacked transformer types
and the crossover wiring can be put on the pc board using
a ground plane to reduce impedance mismatch.
The transmit output needs to be terminated with two
external termination resistors in order to meet the output
impedance and return loss requirements of IEEE 802.3.
It is recommended that these two external resistors be
connected from VDD to each of the TPOP/N outputs, and
their value should be chosen to provide the correct
termination impedance when looking back through the
transformer from the twisted pair cable, as shown in
Figure 12. The value of these two external termination
resistors depends on the type of cable driven by the
device. Refer to the CABLE SELECTION Section for
more details on choosing the value of these resistors.
To minimize common mode output noise and to aid in
meeting radiated emissions requirements, it may be
necessary to add a common mode choke on the transmit
outputs as well as add common mode bundle termination.
The transformers listed in Table 24 all contain common
mode chokes on both the transmit and receive sides, as
shown in Figure 12. Common mode bundle termination is
achieved by tying the unused pairs in the RJ45 to chassis
ground through 75 ohm resistors and a 0.01 uF capacitor,
as shown in Figure 12.
To minimize noise pickup into the transmit path in a
system or on a PCB, the loading on TPOP/N should be
minimized and both outputs should always be loaded
equally.
Table 23. TP Transformer Specification
Parameter
Specification
Transmit
Receive
Turns Ratio
Inductance, (uH Min)
Leakage Inductance, (uH)
Capacitance (pF Max)
DC Resistance (Ohms Max)
1:1 CT
350
0.2
15
0.4
1:1
350
0.2
15
0.4
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