LAN8720AI datasheet(41/79 Pages) SMSC

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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support

Datasheet

SMSC LAN8720A/LAN8720Ai

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

Link

Partner

SMSC

Ethernet Transceiver

10/100

Ethernet

MAC

XFMR

Digital

RXD

TXD

Analog

RJ45 Loopback Cable.

Created by connecting pin 1 to pin 3

and connecting pin 2 to pin 6.

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