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Analysis of board-level with Near-Field ElectroMagnetic Scanning???

William Chen
Prodigy 70 points
Other Parts Discussed in Thread: LMZ20502, LMZ10500

Hi,

one customer(Cable modem ODM company) questions that does LMZ20502 pass the board-level with Near-Field electroMagnetic Scanning?

we just see the datasheet(like as LMZ10500/1) mentioned the EM(CISPR 22 Class B), it figured out long distance measurement, but Near-Field electroMagnetic Scanning means board level measurement around the chip which may interferece the peripheral components, should it cause by integrated inductor ? thanks.

  • 0
    TI__Genius 16025 points

    Hi William,

    The Near Field tests tend to be company specific. To answer with any certainty if the LMZ20502 passes a specific test we would need to know the test parameters, that is, Probe Measurement device, distance from DUT, Orientation and limits.

    Like all switches there is some Near field interference. However the design of a compact module with shielded inductor limits this noise to the greatest extent possible. The switch node is on the right hand side of the package, hence if you want to avoid near field noise, avoid this area during layout.

    Hope this answers your question. Feel free to follow up with any queries you may have.

    Thanks,

    Anston

  • 0 in reply to Anston Lobo
    Prodigy 70 points

    Hi Anston,

    Thanks for your feedback, I will give customer one evm to verify the issue which is topic we talked, may post any question if caused later, thanks.