Different Isolation Transformer Technology

Question

comparing the 2 schema of the EVAL-ADIN2111EBZ and EVAL-ADIN2111D1Z 
 A. why is there two different connections systeme and different parts at the isolation transformer parts between Connectors and PHY? 
 1. T1/T2 with 220uH and without middle connection and Functional ground (FS Earth) , or 2. T1/T2 with W&uuml;rth 74930000 with middle connection and Functional Ground with "C" to (Earth) 
 is this depending von using PoDL or not, or only related to the EMC requirements? 
 
 B. is there any special requirments for the BYPASS RELAY ?

SMohammadi · Accepted Answer

Hi ilaible 
 A. The reason is that the new board EVAL-ADIN2111D1Z supports power forwarding. We selected a larger transformer to allow the use of smaller dual coupled power inductors, 2x47uH while maintaining the total differential inductance to meet the voltage droop and return loss specification. A 350uH isolation transformer could be used, but it would have required larger inductors. 
 The isolation transformer, T1/T2 in EVAL-ADIN2111D1Z doesn't have a center tap, while T1/T2 in EVAL-ADIN2111EBZ does. C101, R88, C104 provide common-mode termination through the center tap. Both the evaluation board designs ensure compliance with the10BASE-T1L standard. The difference in components does not degrade the performance. 
 B. There are no special requirements for the bypass relay. However, ensure that any stray capacitance is kept very low (single-digit pF). Reliability, depending on what the requirements are. 
 
 Regards, 
 Shazia)

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Different Isolation Transformer Technology

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