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DS90LV001: LVDS buffer selection

Oliver Lin
Expert 4975 points

Part Number: DS90LV001
Other Parts Discussed in Thread: SN65LVP19

Hi team,

I would like to check with you LVDS buffer. Do we have device to support below conditions?

 

impedance supports 85ohm

VOD swing to support 800mV

 

Thanks,

Oliver

  • 0
    Guru 324430 points

    Where do these specific values come from?

    That would require a 9.4 mA driver. LVDS is designed for 350 mV over 100 Ω (3.5 mA); M-LVDS, for 570 mV over 50 Ω (11.3 mA), so an M-LVDS buffer might work with this. But M-LVDS signals are bidirectional, so there are no simple buffers.

  • 0
    TI__Genius 16116 points

    Hi Oliver,

    If you want an 800mV VOD, that would no longer be LVDS. That sounds like you are using LVPECL instead. A buffer like SN65LVP19 could be used here. However, LVPECL requires both lines to be terminated to Vcc -2 with 50Ohm resistors, bringing your total differential load to 100Ohms (see below). If you lower this to 85Ohms, you will see a lower VOD swing. 

    Regards,

    Matt