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Original question:

AWR1843: AWR1843 LVDS Extension Redriver chip

AWR1843: Does AWR1843 LVDS interface support SSC(spread spectrum clocking)?

Josh Chen
Prodigy 10 points
Part Number: AWR1843
Other Parts Discussed in Thread: CDCS503

Currently have AWR1843 radar front-end and transfer data to FPGA with LVDS. Does AWR1843 LVDS interface support SSC(spread spectrum clocking)?

Alternatively, If it does not, would CDCS503(LVCOMS) be used for LVDS(differential )interface? 

  • 0
    TI__Guru*** 144184 points

    Hi,

    Due to local holidays there will be a delay in answering this question

    thank you

    Cesar

  • 0
    TI__Guru 58035 points

    Hello Josh,

    The AWR1843 LVDS interface does not support SSC. The LVCOMS buffer cannot be used for LVDS interfaces.

    Could you provide more background on the reason you need SSC on the LVDS interface? In AWR1843 this interface was intended only for debug and development purpose. In the final application the ADC data is expected to be processes internal to the 1843 device, and typically the need to use the LVDS interface would not be there. 

    Regards,
    vivek

  • 0 in reply to Vivek Dham
    Prodigy 10 points

    Hi Vivek,

    Thanks for the reply. i'm working a study on suppress EMI energy from the board, in our application, FPGA will consume all the raw data from LVDS from AWR1843.  

  • 0 in reply to Josh Chen
    Prodigy 10 points

    Hi Vivek,

    I'd like to follow up our discussion, is any part from TI(Similar toCDCS503) that can reduce EMI emission from LVDS interface?

  • 0 in reply to Josh Chen
    TI__Guru 58035 points

    Hello Josh,

    I am not aware of LVDS buffers that support SSC feature. I have seen these mostly in LVCMOS buffers. I would recommend routing the LVDS lines in inner layers, shielding them with Gnd traces etc. to reduce the emissions.

    You could also look at adding metallic shield around your sensor if the routing techniques suggested above are not sufficient .

    Regards,
    vivek