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LDC2112: LDC2112 / LDC2114 redesign due to EMI issues

test_user
Intellectual 625 points
Part Number: LDC2112

Hello,

we're facing a layout redesign due to EMI failures

(discussed in this thread: e2e.ti.com/.../710395

We plan to use LDC2112 now, to place the devices as close as possible near the coils.

We have a few questions:

  • Would you recommend DSBGA or TSSOP regarding EMI issues?
  • Would you recommend 0201, 0402 or 0604 capacitors for Com Capacitor and for sensor capacitors?
  • Should there be a minimum distance between LDC2112 and the coil?
  • Now we place the coils as close as possible to the LDC2112, would you still recommend placing passive filters? Or could they "disimprove" emi performance, due to their large pad sizes?

Thanks for your answers!

Regards,

Clemens

  • 0
    TI__Mastermind 23810 points
    Clemens,

    •Would you recommend DSBGA or TSSOP regarding EMI issues?
    - I would not expect it to make much of a difference.
    •Would you recommend 0201, 0402 or 0604 capacitors for Com Capacitor and for sensor capacitors?
    - I'm not sure about how the capacitor sizes will effect your EMI performance. If smaller capacitors help you place the components closer to the device pins, then that is the way to go.
    •Should there be a minimum distance between LDC2112 and the coil?
    - There is no "minimum distance". We recommend getting as close as you can.
    •Now we place the coils as close as possible to the LDC2112, would you still recommend placing passive filters? Or could they "disimprove" emi performance, due to their large pad sizes?
    - It is still a good idea to keep the footprint for the filtering components. It you find that you need them in the end, it will be difficult to add them without the footprints.
  • 0 in reply to Clancy Soehren
    Intellectual 625 points

    Hi Clancy,

    thanks for you answers, they help us a lot.

    I still have trouble understanding how to implement the filters.

    Could you check the following two schematics and describe how to implement the filters?

    • Should the filters placed between IN-Channels and COM?

    • Or should the filters be placed between COM and GND?

    Thank you very much!

    Kind regards,

    Clemens