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Original question:

AWR1843: LVDS electrical specs - Vo_diff and Vo_cm

AWR1843: LVDS_TXP/M and LVDS_CLKP/M signals

Long Ta1
Prodigy 100 points
Part Number: AWR1843

Hi Vivek,

I captured the LVDS_TXP/M and LVDS_CLKP/M signals (image below at clk = 300MHz & ddr):

- the lvds_clkp/m differential voltage is about 268mV and

- lvds_txp/m0 (lane 0) differential voltage is about 632mV.

The specs is 250mV-450mV, do these output levels seem right or the output configuration settings for clk and txp/m0 are off. 

Kind regards,

Long

  • 0
    TI__Guru 58035 points

    Hello Long,

    I assume you are probing the signal differentially (between P and M lines). The spec is 250 p 450 mV pk-pk single ended. So that would be 500-900mV pk-pk differential. The yellow plot in your figure above seems close to the expected value. The blue signal is off. I think here might be contact issue on one of the pins since the swing is only one sided.

    Regards,
    Vivek

  • 0 in reply to Vivek Dham
    Prodigy 100 points

    Hi Vivek,

    You are right - thank you. There was a bad solder-in probe tip. 

    Kind regards, 

    Long