Technical data

Figure 8: 10BASE-T and 100BASE-TX Interface Circuit Example 2
Table 46 shows some alternatives for the magnetics used in the previous circuits.
Manufacturer Type Remarks
Pulse Engineering H1102
50 Ω 50 Ω 10 Ω
50 Ω 50 Ω 10 Ω
12.4k
75 Ω
75 Ω
75 Ω
75 Ω
10 nF
10 nF
10 nF / 2 kV
3.3 V
AGND
AGND
Case GND
ERTEC 200
P(2:1)TxP
P(2:1)RxN
P(2:1)TxN
P(2:1)TxP
EXTRES
RJ45
1
2
4
5
3
6
7
8
Unmarked resistors: 1/16 W and 1% tolerance
Resistors marked with „
•“
:
1/8 W and 1% tolerance
•
•
•
•
See Table 46
single channel, 0...70°C operating temperature
Pulse Engineering HX1188 single channel, -40...85°C operating temperature
Pulse Engineering H1270 dual channel, 0...70°C operating temperature
Pulse Engineering HX1294 dual channel, -40...85°C operating temperature
Table 46: Examples for Magnetics Selection
In applications, that do not use the 100BASE-FX mode, the related inputs P(2:1)RDxN, P(2:1)RDxP,
P(2:1)SDxN and P(2:1)SDxP should be connected to analog GND, while the related outputs P(2:1)TDxN
and P(2:1)TDxP should be left open. Figure 9 shows the circuit for this case.
Copyright © Siemens AG 2008. All rights reserved. Page 54 ERTEC 200 PHY
Technical data subject to change Version 1.0.0