參數(shù)資料
型號: ICS1893AFLFT
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 57/136頁
文件大小: 0K
描述: PHYCEIVER LOW PWR 3.3V 48-SSOP
標(biāo)準(zhǔn)包裝: 1,000
系列: PHYceiver™
類型: PHY 收發(fā)器
規(guī)程: MII
電源電壓: 3.14 V ~ 3.47 V
安裝類型: 表面貼裝
封裝/外殼: 48-BSSOP(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 48-SSOP
包裝: 帶卷 (TR)
其它名稱: 1893AFLFT
Chapter 6
Interface Overviews
ICS1893AF, Rev. D 10/26/04
October, 2004
27
ICS1893AF Data Sheet - Release
Copyright 2004, Integrated Circuit Systems, Inc.
All rights reserved.
6.3.1
Twisted-Pair Transmitter Interface
The twisted-pair transmitter driver uses an H-bridge configuration. ICS suggests any of the following 1:1
10/100 Magnetics:
Halo TG22S012ND
Midcom 6120-37
Figure 6-1 shows the design for the ICS1893AF 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 ICS1893AF TP_TXP and TP_TXN
pins.
The ICS1893AF supplies the power to the transformer. (No VDD connection is required.)
The ICS1893AF 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, it may be put on the chip side, the RJ-45 side, or both.
2.
Keep all TX traces as short as possible.
3.
When making board traces, 50
-characteristic impedance is desirable.
Figure 6-1.
ICS1893AF Transmit Twisted Pair
ICS1893AF
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
TP_TXP 12
TP_TXN 13
TP_CT 10
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