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Part Number: DP83848K
Hi,I have questions about an external isolation transformer.At first, according to "AN-1469 PHYTER Design & Layout Guide"http://www.tij.co.jp/jp/lit/an/snla079d/snla079d.pdf=>There is a Common Mode Choke on "Cable" side.
Next, according to "TIDA-00207"(TI design),www.tij.co.jp/.../tidu515a.pdf=>There is a Common Mode Choke on "PHY" side.I have a few questions.(1) Why is the circuit different?(2) I think Common mode chock on "Cable" side is usual. Why did you change it when TIDA-0027 is designed(Common Mode Choke on "PHY" side) . Was this done on purpose?
Best Regards,Takahiro Ogo
Ethernet - Applications Engineer
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In reply to Ross Pimentel:
Hi Ross, Thank you for your reply.I'm a little troubled.My customer is using DP83848K and they have already completed their custom board. Their schematic is the same as TIDA-00207. So, CMC is on the phy side. Because TI is providing TIDA-00207 as reference board of DP83848K.Is there any problem with DP83848K using CMC on the PHY side? Also, does TIDA-00207 board work very well?My customer are very worried about this....
In reply to Takahiro Ogo:
Hi Ross,Thank you for your reply. OK, I understood that. I am a little relieved.I would like to ask a question additionally. Are there any advantage to place the CMC on PHY side? In other words, are there any disadvantage to place the CMC on PHY side?# Placing the CMC on Cable side attenuates any common-mode noise than CMC on PHY side?# Placing the CMC on PHY side is strong at ESD? Best Regards,Takahiro
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