參數(shù)資料
型號(hào)： 84C24
廠商： LSI Corporation
英文描述： Quad 10Base-T Ethernet Media Interface Adapter(四通道10Base-T以太網(wǎng)媒體接口適配器)
中文描述： 四10Base - T以太網(wǎng)媒體接口適配器（四通道10Base - T的以太網(wǎng)媒體接口適配器）
文件頁數(shù)： 22/51頁
文件大?。?/td> 435K
代理商： 84C24
84C24
4-22
MD400147/A
5.0 Application Information
5.1 EXAMPLE SCHEMATICS
Typical examples of the 84C24 used in a switching hub
applications are shown in the schematics in Figures 7 and
8.
5.2 TP TRANSMIT INTERFACE
The interface between the TP outputs on TPO
±
and the
twisted pair cable requires a transformer and two resistors
for each channel as shown in Figure 7 and 8.
The transmit transformer specifications are shown in
Table 9. Sources for the transformer are isted n Table 10.
Table 10. Transformer Sources
Vendor
Valor
NanoPulse
PCA
Belfuse
Pulse Engr
Part Number
ST4178
NP6098-30
EPE6130S
S553-1084-02
PE68042
5.3 TP RECEIVE INTERFACE
Receive data is typically transformer coupled into the
receive inputs on TPI
±
and terminated with an external
resistor as shown in Figure 7 and 8.
The receive transformer specification is shown in Table 9.
Sources for the transformer are listed in Table 10.
The receive input needs to be terminated with 98 ohms in
order to meet input impedance requirements of IEEE
802.3 Section 14. Notice hat n Figure 7 and 8, the receive
input has this input termination resistor broken up into two
49 ohm 1% resistors with a 0.1
μ
F capacitor tied between
the center points and GND. This capacitor attenuates
common mode input noise. The 0.1
μ
F capacitor is op-
tional and is only needed if the device is required to meet
the receive common mode input AC voltage specification
in IEEE 802.3 Section 14. If the capacitor is not needed,
then the two termination resistors can be lumped into one
98 ohm 1% resistor across TPI
±
.
In order to minimize noise pickup into the receive path,
loading on TPI
±
should be minimized and both inputs
should be loaded equally.
5.4 TP TRANSMIT OUTPUT CURRENT SET
The TPO
±
output current evel s set by an external resistor
tied between REXT and GND. The output current is
determined by the following equation where R is the value
of REXT:
I
out
= (R/10K)*
REXT should be a 1% resistor n order to meet IEEE 802.3
specified levels.
Two external 400 ohm 1% resistors are needed on TPO
±
to provide a 100 ohm ermination mpedance when ooking
back through the transformer from the twisted pair cable,
as shown in the Figure 7 and 8 schematic.
The 84C24 has special circuitry to reduce common mode
noise on the twisted pair output. However, common mode
chokes may be needed to meet emissions requirements.
Common mode chokes are not llustrated n he application
schematics in Figures 7 and 8.
To minimize noise pickup, the oading on TPO
±
should be
minimized and both outputs should always be loaded
equally.
Table 9. Transformer Specification
Parameter
Specification
Transmit
2 2:1 CT
200
Receive
1:1
200
Turns Ratio
Inductance
(
μ
H Min)
Leakage
Inductance
(
μ
H Max)
Capacitance
(pF Max)
DC Resistance
(Ohms Max)
0.4
0.2
10
10
0.25
0.25
相關(guān)PDF資料
PDF描述
84C300A 84C300A 4-Port Fast Ethernet Controller manual 3/98
84C30A 84C30A 10 Mbps Controller (MAC) manual 12/96
84C300A 4-Port Fast Ethernet Controller(四端口快速以太網(wǎng)控制器)
84CNQ035 Schottky Rectifier
84CNQ040 Schottky Rectifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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84C2A-A12-J10L 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn
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