參數(shù)資料
型號： 1893YI-10
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： DATACOM, INTERFACE CIRCUIT, PQFP64
封裝： 10 X 10 MM, TQFP-64
文件頁數(shù)： 79/152頁
文件大?。?/td> 943K
代理商： 1893YI-10
ICS1893 Rev C 6/6/00
June, 2000
32
Chapter 6
Interface Overviews
ICS1893 Data Sheet - Release
Copyright 2000, Integrated Circuit Systems, Inc.
All rights reserved.
6.5.1
Twisted-Pair Transmitter Interface
The twisted-pair transmitter driver uses an H-bridge configuration, which requires that the transmit
transformer not have a choke on the chip side. ICS suggests any of the following for the H-bridge:
Halo TG22S012ND transformer
Transpower HB617-LP transformer
Pulse 68517 transformer, which can be turned around to move the choke windings to the RJ-45 side
Figure 6-1 shows the design for the ICS1893 twisted-pair transmitter interface.
Two 61.9
1% resistors are in series, with a 120-nH 5% inductor between them. These components
form a network that connects across both the transformer and the ICS1893 TP_TXP and TP_TXN pins.
The ICS1893 supplies the power to the transformer. (No VDD connection is required.)
The ICS1893 TP_CT pin is connected directly to the transformer transmit center tap connection and is
bypassed to ground with a 100-pF capacitor. The transformer center tap must not connect to the
resistor/inductor network.
Note:
1.
If the transmit transformer has a choke, put a choke on the RJ-45 side. Do not put a choke on the
ICS1893 side of the transformer for the transmit windings.
2.
Keep all TX traces as short as possible.
3.
When making board traces, 50
-characteristic impedance is desirable
4.
Include a 0
resistor in series with TP_CT. (Some systems work better without the TP_CT
connection.)
Figure 6-1.
ICS1893 Transmit Twisted Pair
ICS1893
TP_TXP 5
TP_TXN 6
TP_CT 3
61.9
1%
120 nH
61.9
1%
To RJ-45
1:1
System Ground Plane
Chassis Ground Plane
75
0.1
F
Separate Ground Plane
Ideally, for these traces Zo = 50 .
Center
Tap
100 pF
0
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