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LAN8720AI Fiches technique(PDF) 41 Page - SMSC Corporation

No de pièce LAN8720AI
Description  Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
PDF  79 Pages
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Fabricant  SMSC [SMSC Corporation]
Site Internet  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN8720AI Fiches technique(HTML) 41 Page - SMSC Corporation

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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720A/LAN8720Ai
41
Revision 1.4 (08-23-12)
DATASHEET
3.8.8.3
Connector Loopback
The device maintains reliable transmission over very short cables, and can be tested in a connector
loopback as shown in Figure 3.14. An RJ45 loopback cable can be used to route the transmit signals
an the output of the transformer back to the receiver inputs, and this loopback will work at both 10 and
100.
3.9
Application Diagrams
This section provides typical application diagrams for the following:
Simplified System Level Application Diagram
Power Supply Diagram (1.2V Supplied by Internal Regulator)
Power Supply Diagram (1.2V Supplied by External Source)
Twisted-Pair Interface Diagram (Single Power Supply)
Twisted-Pair Interface Diagram (Dual Power Supplies)
Figure 3.13 Far Loopback Block Diagram
Figure 3.14 Connector Loopback Block Diagram
Far-end system
SMSC
Ethernet Transceiver
10/100
Ethernet
MAC
CAT-5
XFMR
Digital
RXD
TXD
Analog
RX
TX
Link
Partner
X
X
SMSC
Ethernet Transceiver
10/100
Ethernet
MAC
XFMR
Digital
RXD
TXD
Analog
RX
TX
1
2
3
4
5
6
7
8
RJ45 Loopback Cable.
Created by connecting pin 1 to pin 3
and connecting pin 2 to pin 6.



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