參數(shù)資料
型號: ICS1893AF
英文描述: 3.3V 10Base-T/100Base-TX Integrated PHYceiverTM
中文描述: 3.3 10BASE-T/100BASE-TX快速以太網(wǎng)集成PHYceiverTM
文件頁數(shù): 7/12頁
文件大小: 170K
代理商: ICS1893AF
Product Brief
ICS1893AF
Page 7
Document Revision: 5 April 2002
Typical Board Layouts
Twisted-Pair Transmitter Interface
The twisted-pair transmitter driver uses an H-bridge configuration. .
ICS suggests using 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.
The figure below 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 transmitter output H drive configuration supplies 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 100pF capacitor.
Note:
1. If the transformer has a choke, it may be put on the chip side, RJ-45 side or both.
2. Keep all TX traces as short as possible.
3.
When making board traces, 50
characteristic impedance is desirable.
ICS1893 Transmit Twisted Pair
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