DP83867CR: Specific Compliance Issue

TI-CSC

Genius 14660 points

Part Number: DP83867CR

Tool/software:

Hello E2E Experts,

Good day.

Using center tapped magnetics, what specific compliance did the part failed?

Is is EMC? Or something else.

Regards,

TICSC

5 months ago

0 David (ASIC) Liu 5 months ago

TI__Guru**** 181321 points

TICSC

Can you please provide more context for this question? Is the customer seeing a particular EMC failure with the DP83867CR? If this is the case, then can you please share the compliance report?

Thanks

David

0 TI-CSC 5 months ago in reply to David (ASIC) Liu

TI__Genius 14660 points

Hello David,

Good day and apologies for the confusion.

I am planning to use RJ45 with integrated magnetics.

LPJK6064AONL (1).pdf

Based on the link:

DP83867CR: Ethernet Connectors with integrated magnetics

Center-tap magnetics shorted together creates compliance issues.

What specific compliance? Or perhaps certifying body?

On the other hand, the DP83867 EVM uses magnetics center tap shorted together which is contradicting to the post.

Regards,

TICSC

0 David (ASIC) Liu 5 months ago

TI__Guru**** 181321 points

TICSC

Shorted center taps can increase the common mode noise on the MDI lines, increase cross talk between TX and RX, and also affect the bias voltage point on TX. It can impact the Direct Contact Discharge ESD, EFT, and Surge performance.

As you can see from the below drawing, the short tap of the transformer on the EVM is not shorted together.

Thanks

David

0 TI-CSC 5 months ago in reply to David (ASIC) Liu

TI__Genius 14660 points

Hello David,

Can I use this RJ45 with integrated magnetics?

2318.LPJK6064AONL (1).pdf

Regards,

TICSC

0 David (ASIC) Liu 5 months ago in reply to TI-CSC

TI__Guru**** 181321 points

TICSC

You can use this integrated transformer. But typically we see discrete magnetic has better EMC performance than the integrated magnetic.

Thanks

David

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DP83867CR: Specific Compliance Issue