參數(shù)資料
型號： 9863
廠商： Intel Corp.
英文描述： Advanced 10/100 Umnmanaged Repeater
中文描述： 高級10/100 Umnmanaged直放站
文件頁數(shù)： 36/56頁
文件大?。?/td> 719K
代理商： 9863
LXT9883/9863
—
Advanced 10/100 Unmanaged Repeater
36
Datasheet
Document #: 249115
Revision #: 003
Rev. Date: 08/07/01
4.2.7
Twisted-Pair Interface
The LXT98x3 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:
Place magnetics as close as possible to the LXT98x3.
Keep transmit pair traces short.
Do not route transmit pair adjacent to a ground plane. Eliminate planes under the transmit
traces completely. Otherwise, keep planes 3-4 layers away.
Improve EMI performance by filtering the output center tap supply. A single ferrite bead may
be used in the center tap supply to all ports. All ports draw a combined total of > 1000 mA, so
the bead should be rated at > 1500 mA.
Place the 270pF 5% capacitors at TPIP and TPIN to improve the signal-to-noise immunity at
the receiver.
In addition, follow all the standard guidelines for a twisted-pair interface:
Route the signal pairs differentially, close together. Allow nothing to come between them.
Keep distances as short as possible; both traces should have the same length.
Avoid vias and layer changes.
Keep the transmit and receive pairs apart to avoid cross-talk.
To provide maximum isolation, place entire receive termination network on one side and
transmit on the other side of the PCB.
Bypass common-mode noise to ground on the in-board side of the magnetics using 0.01
μ
F
capacitors.
Keep termination circuits grouped closely together and on the same side of the board.
Always put termination circuits close to the source end of any circuit.
4.2.7.1
Magnetics Information
The LXT98x3 requires a 1:1 ratio for the receive transformers and a 1:1 ratio for the transmit
transformers. The transformer isolation voltage should be rated at 2kV to protect the circuitry from
static voltages across the connectors and cables. Refer to
Table 17
for magnetics specifications.
Table 17. LXT98x3 Magnetics Specifications
Parameter
Min
Nom
Max
Units
Test Condition
Rx turns ratio
–
1 : 1
–
–
Tx turns ratio
–
1 : 1
–
–
Insertion loss
0.0
–
1.1
dB
80 MHz
Primary inductance
350
–
–
μ
H
Transformer isolation
–
2
–
kV
Differential to common mode rejection
-40
–
–
dB
.1 to 60 MHz
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9863.2100 功能描述:安裝硬件 TRANSIPILLAR TPI/ 16.0/32.0/M6/S-S RoHS:否 制造商:Harwin 類型:SMT Cable Clip 材料:Phosphor Bronze 安裝孔大小: 長度:5 mm 外徑: 內(nèi)徑: 厚度: 電鍍:Tin 螺紋大小:
9863.22 制造商:Schurter Electronic Components 功能描述:TRANSIPILLAR STYLE 2 M6 制造商:Schurter Electronic Components 功能描述:TRANSIPILLAR, STYLE 2, M6 制造商:Schurter Electronic Components 功能描述:TRANSIPILLAR, STYLE 2, M6; Overall Length:32mm; Thread Size - Metric:M6; Spacer Material:Nylon 6.6 (Polyamide 6.6); SVHC:No SVHC (19-Dec-2012); External Diameter:16mm; External Length / Height:44.5mm; Fastener Material:Nylon 6.6 ;RoHS Compliant: Yes
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