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SRC4392: EMC failure for AES outputs

Graham North1
Intellectual 405 points
Part Number: SRC4392

Tool/software:

Hi,

Do you have any recommendations for reducing conducted and radiated emissions on the AES outputs?

Regards,

Graham

  • 0
    TI__Intellectual 2695 points

    Hi Graham,

    Our SRC expert is out of office right now, so please be patient as a response may be available by the end of next week.

    Best,

    Garret

  • 0
    TI__Mastermind 30711 points

    Hello Graham,

    We don't have any specific recommendations for our SRC devices regarding the EMC beyond the general recommendations. In almost all cases, the failures are related to the board and external components and is not really related to the device per say.  You can find many recommendations regarding EMI and EMC online. 

    Let me know if you have a  question in that regard.

    Kind Regards,

    Arash

  • 0 in reply to Arash Loloee
    Intellectual 405 points

    Hi,

    Thanks for your reply.

    Well the thing is the output is designed as per the datasheet, so I'm a little surprised that you can't offer any specific help! These devices switch very quickly so can be troublesome.
    I have searched online looking for EMI and EMC recommendations for differential digital signal interfaces and haven't actually found much, so if you do know of any good content please would you share it?

    Also, is this part designed to drive 100m of cable with the recommended output circuit in the datasheet, or would changes be needed? If they would, do you have any details on this?

    Regards,

    Graham

  • 0 in reply to Graham North1
    TI__Mastermind 30711 points

    Hello Graham,

    I don't know  of any specific EMI and EMC recommendations for differential digital signal interfaces, most of the EMI  material are usually about switching power supplies. But still the principle can be applied to reduce or mitigate the EMI/EMC in any device. 

     From my past experience,  EMI/EMC issues are mostly layout and component related issue. For example,  in one case we replaced the power supply with a 12V battery to improve the EMI and to our surprise, EMI got worse and replacing the battery with another type of  battery helped the EMI. Ferrite bead, twisted cables and enclosures are all common practices to reduce EMI in general . I am sure you already know this but I add the EMI sources  here for future users reference: 

    • Integrated circuit (I/O switching)
    • Package Leadframe  &  Bond wire
    • PCB tracks
    • Via
    • Ground and power planes
    • Cable assembly
    • Apertures / seams

    Here are few references that you should be able to access these and more from ti.com

    SSZT173 – APRIL 2021  Introduction to EMI: Standards, Causes and Mitigation Techniques

    https://www.ti.com/video/6241816203001?keyMatch=emi&tisearch=universal_search : EMI training Series 

    https://www.ti.com/video/6118681837001?keyMatch=emi&tisearch=universal_search :  Practical EMI Considerations for Low-Power AC/DC Supplies: Introduction to EMI, DM vs CM

    I would think 100 meter  cable would cause a voltage drop on the output line  and thus  a voltage translation or buffer would be needed .

    Regards,

    Arash