参数资料
型号: WJLXT971ALE.A4SE000
厂商: CORTINA SYSTEMS INC
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封装: LEAD FREE, LQFP-64
文件页数: 60/116页
文件大小: 1172K
代理商: WJLXT971ALE.A4SE000
LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
48
Datasheet
Document #: 249414
Revision #: 002
Rev. Date: August 7, 2002
4.0
Application Information
4.1
Magnetics Information
The LXT971A requires a 1:1 ratio for both the receive and transmit transformers. The transformer
isolation voltage should be rated at 2 kV to protect the circuitry from static voltages across the
connectors and cables. Refer to Table 15 for transformer requirements.
A cross-reference list of magnetic manufacturers and part numbers is available in Magnetic
Manufacturers for Networking Product Applications (document number 248991) and is found on
the Intel web site (www.Intel.com). Before committing to a specific component, contact the
manufacturer for current product specifications and validate the magnetics for the specific
application.
4.2
Typical Twisted-Pair Interface
Table 16 provides a comparison of the RJ-45 connections for NIC and Switch applications in a
typical twisted-pair interface setting.
Figure 22 on page 49 shows a typical twisted-pair interface with the RJ-45 connections crossed
over for a Switch configuration. Figure 23 on page 50 provides a typical twisted-pair interface with
the RJ-45 connections configured for a NIC application.
Table 15. 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
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 16. I/O Pin Comparison of NIC and Switch RJ-45 Setups
Symbol
RJ-45
Switch
NIC
TPIP
1
3
TPIN
2
6
TPOP
3
1
TPON
6
2
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WJLXT971ALE.A4SE001 DATACOM, ETHERNET TRANSCEIVER, PQFP64
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