參數資料
型號： LXT972A
廠商： Intel Corp.
英文描述： 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
中文描述： 3.3雙速快速以太網收發(fā)器數據表
文件頁數： 40/70頁
文件大?。?/td> 833K
代理商： LXT972A
LXT972A
—
3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
40
Datasheet
4.0
Application Information
4.1
Magnetics Information
The LXT972A requires a 1:1 ratio for both the receive and 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 14
for transformer requirements.
A cross-reference list of magnetic manufacturers and part numbers is available in Application Note
073, Magnetic Manufacturers, which can be found on the Intel web site (developer.intel.com/
design/network/). Before committing to a specific component, designers should contact the
manufacturer for current product specifications, and validate the magnetics for the specific
application.
4.2
Typical Twisted-Pair Interface
Table 15
provides a comparison of the RJ-45 connections for NIC and switch applications in a
typical twisted-pair interface setting.
Figure 21 on page 41
shows a typical twisted-pair interface with the RJ-45 connections crossed
over for a switch configuration.
Figure 22 on page 42
provides a typical twisted-pair interface with
the RJ-45 connections configured for a NIC application.
Table 14. Magnetics Requirements
Parameter
Min
Nom
Max
Units
Test Condition
Rx turns ratio
–
1 : 1
–
–
Tx turns ratio
–
1 : 1
–
–
Insertion loss
0.0
0.6
1.1
dB
Primary inductance
350
–
–
μ
H
Transformer isolation
–
1.5
–
kV
Differential to common mode rejection
40
–
–
dB
.1 to 60 MHz
35
–
–
dB
60 to 100 MHz
Return Loss
-16
–
–
dB
30 MHz
-10
–
–
dB
80 MHz
Table 15. RJ-45 Pin Comparison of NIC and Switch Twisted-Pair Interfaces
Symbol
RJ-45
Switch
NIC
TPIP
1
3
TPIN
2
6
TPOP
3
1
TPON
6
2
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相關代理商/技術參數
參數描述
LXT972ALC 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
LXT972LCHFB8 制造商:LEVEL_ONE 功能描述:
LXT972M 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Single-Port 10/100 Mbps PHY Transceiver
LXT973QC 制造商:Intel 功能描述:LAN Transceiver, Dual, 100 Pin, Plastic, QFP
LXT974 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Fast Ethernet 10/100 Quad Transceivers
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