DJLXT972ALC.A4 Cortina Systems Inc, DJLXT972ALC.A4 Datasheet - Page 47

• Manufacturer Part Number: DJLXT972ALC.A4
• Manufacturer: Cortina Systems Inc

Specifications of DJLXT972ALC.A4

• Lead Free Status / RoHS Status: Not Compliant

LXT972A PHY
Datasheet
249186, Revision 5.2
13 September 2007
6.0
6.1
Note:
Table 18
6.2
Table 19
Cortina Systems
Application Information
Magnetics Information
The LXT972A PHY 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
Before committing to a specific component, contact the manufacturer for current product
specifications and validate the magnetics for the specific application.
Magnetics Requirements
Typical Twisted-Pair Interface
Table 19
in a typical twisted-pair interface setting.
I/O Pin Comparison of NIC and Switch RJ-45 Setups
Figure 19
connections crossed over for a Switch configuration.
®
Rx turns ratio
Tx turns ratio
Insertion loss
Primary inductance
Transformer isolation
Differential to common mode rejection
Return Loss
LXT972A Single-Port 10/100 Mbps PHY Transceiver
Symbol
18.
TPON
TPOP
TPIP
TPIN
provides a comparison of the RJ-45 connections for NIC and Switch applications
shows the LXT972A PHY in a typical twisted-pair interface, with the RJ-45
Parameter
Switch
1
2
3
6
RJ-45
Min
350
-16
-10
0.0
40
35
–
–
–
NIC
3
6
1
2
Nom
1 : 1
1 : 1
0.6
1.5
–
–
–
–
–
Max
1.1
–
–
–
–
–
–
–
–
Units
6.0 Application Information
dB
μ H
dB
dB
dB
dB
kV
–
–
Test Condition
60 to 100 MHz
0.1 to 60 MHz
30 MHz
80 MHz
–
–
–
–
–
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