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DS10BR150: DS10BR150 output terminal resistor

Sunny Qin
Expert 4890 points
Part Number: DS10BR150

Hi team,

Why we add 100ohm output terminal resistor to DS10BR150, as far as i know most applicaiton just need terminal resistor on input side.

Thanks.

Regards, Sunny

  • 0
    TI__Guru* 93670 points

    Hi Sunny,

    DS10BR150 has integrated input and output 100-ohm termination. On the output side - within the FPGA, ASIC, scope, or load there should be 100-ohm termination. This is normally true for all of the high speed devices. Please note data sheet block diagram such as figures 1,2, and 5.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    TI__Expert 4890 points

    Hi Nasser,

    Thanks for comments, yes, for output side, terminal resistor should near input of FPGA/ASIC, that means the trace should be: LVDS output driver->signal line-> terminal resistor and input of FPGA/ASIC, so there should not need terminal resistor on the output side of LVDS driver, then why we add that in DS10BR150?

    Thanks.

    Regards, Sunny

  • 0 in reply to Sunny Qin
    TI__Guru* 93670 points

    Hi Sunny,

    The driver - DS10BR150 output - should have an impedance for example 100-ohm. Otherwise, it would be high impedance and there would be reflections and all the signal energy would get reflected back.

    Regards,, Nasser