Silex technology SX-550 manual Ethernet PHY, Transformer Specification

Ethernet PHY

The Ethernet PHY is located on the processor card. The manufacturer is Davicom and the part number is DM9161AE. For additional information on the layout of the transformer and RJ-45 jack, refer to the Davicom website at www.davicom.com.tw.

2	1:1	1
7		2
4
		3
40-pin	Transformer	4
OEM		5	RJ46
Header	1:1	6
1
		7
7
3		8

Figure 23 Circuit Diagram with Transformer

Transformer Specification

Table 33 and Table 34 detail the magnetic specifications and manufacturer sources. Magnetics that meet these requirements are available from various magnetic manufacturers. You should test and qualify the magnetic specifications prior to use in your application. The magnetics listed are electrical equivalents; however, may not be pin-to-pin equivalents.

Table 33 10/100M Magnetic Specifications

Parameter	Values	Units	Test Conditions
TX/RX Turns Ratio	1:1 CT/1:1		
Inductance	350	∝H minimum
Insertion Loss	1.1	dB maximum	1 to 100 MHz
Return Loss	-18	dB minimum	1 to 30 MHz
	-14	dB maximum	30 to 60 MHz
	-12	dB minimum	60 to 80 MHz
Differential to Common Mode	-40	dB maximum	1 to 60 MHz
Injection
	-30	dB minimum	60 to 1000 MHz
Transformer Isolation	1500	V	

Designing with the SX-550 silex Page 49

Part Number 40183-101