參數(shù)資料
型號: 9860
廠商: Intel Corp.
英文描述: Advanced 10/100 Repeater with Intergrated Management
中文描述: 高級10/100中繼器與綜合管理
文件頁數(shù): 65/118頁
文件大?。?/td> 1648K
代理商: 9860
Advanced 10/100 Repeater with Integrated Management
LXT9860/9880
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
65
4.3.2
MII Terminations
The LXT98x0 MIIs have high output impedance (250-350
). To minimize reflections, serial
termination resistors are recommended on all MII signals, especially with designs with long traces
(>3 inches). Place the resistor as close to the device as possible. Use a software trace termination
package to select an optimal resistance value for the specific trace. Proper value = nominal trace
impedance minus 13
. If a software package cannot be used and nominal trace impedance is not
known, use 55
.
4.3.3
Twisted-Pair Interface
The LXT98x0 transmitter uses standard 1:1 magnetics for both receive and transmit. Nonetheless,
system designers should take precautions to minimize parasitic shunt capacitance and meet return
loss specifications. These steps include:
Figure 21. Power and Ground Connections
RBIAS
VCC
GND
GND
VCCR
GND
.01
μ
F
22.1 k
1%
GND
VCC
0.1
μ
F
+
Ferrite
Beads
10
μ
F
+3.3V
LXT9880
VCCT
GND
10
μ
F
.01
μ
F
.1
μ
F
.1
μ
F
Digital Supply Plane
Analog Supply Plane
.01
μ
F
.1
μ
F
To Output Magnetics Centertap
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