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參數(shù)資料
| 型號： | L84225 |
| 英文描述： | L84225 100BaseTX/FX/10BaseT Physical Layer Device technical manual 4/02 |
| 中文描述： | L84225 100BaseTX/FX/10BaseT物理層設(shè)備的技術(shù)手冊，4月2日 |
| 文件頁數(shù)： | 76/118頁 |
| 文件大?。?/td> | 890K |
| 代理商： | L84225 |
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76 of 118
April, 2002
L84225 Quad 100BaseTX/FX/10BaseT Phys. Layer Device - Technical Manual
Copyright 1999-2002 by LSI Logic Corporation. All rights reserved.
the series resistor string and Vcc in order to provide an AC ground for
attenuating common mode signal at the input. This capacitor is also
shown in
Figure 11
.
To minimize common mode input noise and to aid in meeting
susceptibility requirements, it may be necessary to add a common mode
choke on the receive input as well as add common mode bundle
termination. The transformers listed in
Table 22
contain common mode
chokes on both the transmit and receive sides, as shown in
Figure 11
.
Common mode bundle termination is achieved by tying the receive
secondary center tap and the unused pairs in the RJ45 to chassis ground
through 75 ohm resistors and a 0.01 uF capacitor, as shown in
Figure 11
.
In order to minimize noise pickup into the receive path in a system or on
a PCB, the loading on TPIP/N should be minimized and both inputs
should be loaded equally.
4.3 TP Transmit Output Current Set
The TPOP/N output current level is set by an external resistor tied
between REXT and GND. This output current is determined by the
following equation where R is the value of REXT:
I
out
= (10K/R) I
ref
Where I
ref
= 40 mA (100 Mbps, UTP)
= 32.6 mA (100 Mbps, STP)
= 100 mA (10 Mbps, UTP)
= 81.6 mA (10 Mbps, STP)
For 100 Ohm UTP, REXT should be typically set to 10K ohms and REXT
should be a 1% resistor in order to meet IEEE 802.3 specified levels.
Once REXT is set for the 100 Mbps and UTP modes as shown by the
equation above, Iref is then automatically changed inside the device
when the 10 Mbps mode or UTP120/STP150 modes are selected as
described in
Section 5.3, “Twisted Pair Characteristics, Transmit,”
page 89
.
Keep resistor REXT as close to pins REXT and GND as possible in order
to reduce noise pickup into the transmitter.
Since the TP output is a current source, capacitive and inductive loading
can reduce the output voltage level from the ideal. Thus, in an actual
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