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DS90UB935-Q1: About POC device selection

Jack Li
Intellectual 2380 points
Part Number: DS90UB935-Q1
Other Parts Discussed in Thread: DS90UB936-Q1,

Hi FPD Link team,

1.My customer using DS90UB935-Q1 and DS90UB936-Q1, they wonder how to select the POC inductors, and we give this application notes, but it seems that these inductors(like BLM18BD152 and LQH3NPN100MJR) are no longer produced， could you please give us some new POC inductors and capacitors PN? And they wonder how to evaluate POC device selection?

www.ti.com.cn/.../snla272.pdf

2.Their project S11 can meet the requirements, but EMC cannot pass. RI02 test fails. How to solve it? Could you please give some advice?

Best Regards！

Jack

  • 0
    TI__Mastermind 26540 points

    Hi Jack,

    This app note contains information on selecting an appropriate POC network for a given application as well as many example networks and the appropriate part numbers. It is also often recommended to reach out to third party vendors such as Murata, Coilcraft, TDK, etc. directly as they are the experts of their devices and the networks they designed. 

    The S11 requirement comes from the channel specifications. While these requirements have to be met for device functionality, they are different from EMC. Meeting channel specifications does not guarantee passing EMC requirements. EMC is a system level specification that will be impacted by the system's housing, shielding, layout, etc. There are some general techniques/recommendations used to limit EMC such as using metal shielding, controlled trace impedance, and good grounding within the layout. This applications journal provides more details regarding layout best practices. Additionally, if synchronous mode is being used, the 936 is able to support spread spectrum clocking on the REFCLK. The REFCLK frequency can also be modified, changing the speed of the forward channel, to potentially shift energy to different frequency bands.

    Regards,
    Darrah