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LMK05318B: VOD adjustment for LVDS output swim

Eddie Chou
Expert 6200 points
Part Number: LMK05318B

Tool/software:

Hi Team, 

Customer measure our LMK05318B LVDS output swim is large than spec. is there any register setting can help customer find tune the LVDS VOD output?

Thanks & Regards

Eddie

  • 0
    TI__Genius 16585 points

    Hi Eddie,

    it is not possible to adjust the swing besides the available options: HCSL,  "AC-LVDS", "AC-CML", or  "AC-LVPECL". Each AC-type corresponds to a current level setting on the current driver (there are only three swing options for the AC-type).

    Can you please share the LVDS VOD spec required by the receiver?

    Regards,

    Jennifer

  • 0 in reply to Jennifer Bernal
    TI__Expert 6200 points

    Hi Jenifer, 

    Below is specification from receiver, 

    the output from LMK05318B Vpp is 9xxmV. 

    Thanks & regards

    Eddie

  • 0 in reply to Eddie Chou
    TI__Genius 16585 points

    Hi Eddie,

    Thanks for providing the receiver details.

    I see that the receiver has a max Vpp spec of 900mV. The max LMK05318B VOD spec for AC-LVDS is 450mV which means the max Vpp level is 900mV; this would meet their spec.

    • Can you please share the schematic for the measured LMK05318B output clock?
    • Do they measure with the output clock connected to the receiver?
    • How are they probing the output clock signal?
    • Please share a oscilloscope screenshot of the AC-LVDS output clock showing the swing level measurement.

    Regards,

    Jennifer