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| 型号： | WJLXT907ALCA4 |
| 厂商： | CORTINA SYSTEMS INC |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| 封装： | ROHS COMPLIANT, LQFP-64 |
| 文件页数： | 11/48页 |
| 文件大小： | 621K |
| 代理商： | WJLXT907ALCA4 |
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Intel
LXT901A/907A Universal 3.3 V Ethernet Transceiver
Datasheet
19
Document Number: 249098
Revision Number: 003
Revision Date: 27-Nov-2005
2.6
Link Pulse Transmission
When not transmitting data, the LXT901A/907A Transceiver transmits IEEE 802.3-compliant
standard link pulses. Figure 8 shows the link integrity pulse timing.
3.0
Application Information
3.1
Twisted-Pair Impedance Matching
Resistors must be installed on each input and output pair to match impedance of the network media
being used. The LXT907A Transceiver is configured with 100
Ω termination for Unshielded
Twisted-Pair (UTP). In this case, the positive and negative sides of both output pairs are shorted
together (TPOPA/TPOPB and TPONA/TPONB) and tied to the transformer through a 24.9
Ω 1%
series resistor.
The LXT901A Transceiver is designed with an STP Select pin that allows the device to match both
100
Ω and 150Ω media. A dual resistor combination can be configured to accommodate either line
termination as shown in Figure 16 on page 28. When 100
Ω termination is selected, both A and B
pairs are driven in parallel. When 150
Ω termination is selected, the B pair is tri-stated and only the
A pair is driven.
3.2
Crystal Information
Designers should test and validate crystals before committing to a specific component. Based on
limited evaluation, Table 3 lists some suitable crystals.
3.3
Magnetics Information
The LXT901A/LXT907A Transceiver requires a 1:1 ratio for the receive transformer and a 1:
√
2
ratio for the transmit transformer on the twisted-pair interface. The AUI Interface requires a 1:1
ratio for the data-in, data-out, and collision-pair transformers. A cross-reference list of suitable
Figure 8. Transmitted Link Integrity Pulse Timing
10-20 ms
10-20 ms 10-20 ms
10-20 ms
Table 3.
Suitable Crystals
Manufacturer
Part Number
MTRON
MP-1
MP-2
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