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DS90LV804: LVDS Drive Current VS Load

PETER LUDLOW98
Prodigy 100 points
Part Number: DS90LV804

Hello,

 

We are planning to use the DS90LV804 LVDS buffer/repeater in our system to drive LVDS signals at 250 Mbps (ADC output data lines) through a 3 metre length of Cat6 cable. I’m assuming that since LVDS uses a current-mode driver there is no current dependence on the capacitance of the cable or on capacitance of TVS diodes used at the cable-side of the buffer/repeater? And that we can therefore expect power supply current for 250 Mbps data rate to be as shown in Figure 6 of the datasheet, i.e. < 140 mA?

 

Best regards,

Peter.

  • 0
    TI__Mastermind 43795 points

    Hi Peter,

    The current requirement will typically be < 140mA with a clock or PRBS pattern at 250 Mbps.  The current demand will not change based on cable length or TVS diode capacitance.  I would recommend to use low capacitance TVS diodes to ensure minimal distruption of the signal quality.

    Regards,

    Lee