FALXT972MCCA4 datasheet(57/92 Pages) INTEL

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Intel

® LXT972M Single-Port 10/100 Mbps PHY Transceiver

Datasheet

Document Number: 302875-005

Revision Date: 27-Oct-2005

6.0

Application Information

6.1

Magnetics Information

The LXT972M Transceiver 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. For transformer/magnetics requirements, see Table 19.

Note:

Before committing to a specific component, contact the manufacturer for current product

specifications and validate the magnetics for the specific application.

6.2

Typical Twisted-Pair Interface

Table 20 provides a comparison of the RJ-45 connections for NIC and Switch applications in a

typical twisted-pair interface setting.

Table 19. 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

–

Primary inductance

350

–

μH–

Transformer isolation

–

1.5

–

Differential to common mode rejection

–

0.1 to 60 MHz

–

60 to 100 MHz

Return Loss

-16

–

30 MHz

-10

–

80 MHz

Table 20. I/O Pin Comparison of NIC and Switch RJ-45 Setups

Symbol

RJ-45

Switch

NIC

TPIP

TPIN

TPOP

TPON

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