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Output magnitude of SN65LVDS105

Di Wang
Expert 1740 points
Other Parts Discussed in Thread: SN65LVDS105

Hi,

        Below value is measured with Vid=±100mV, but the input of SN65LVDS105 is LVTTL level, it should be in Via, not Vid.

My input is Via magnitude is over 3V as below shows.

The differential output magnitude is as blow with 100 ohm load. The |Vod| peak to peak value is much larger than stated max value 454mV. I measured it with a 50 ohm differential probe. Is this a normal operation for the output magnitude? Thanks.

 t

  • 0
    TI__Guru 62920 points
    Hi Di,

    The |VOD| specification in the LVDS105 datasheet is actually the "peak" magnitude of the differential signal rather than the full peak-to-peak swing. So, a maximum value of 454 mV means that the "high" level can be as large as +454 mV and the "low" level can be as small as -454 mV (giving a total peak-to-peak swing of 908 mV). Based on this, the measurement results you show do seem to align with the datasheet range of 247 mV (minimum) to 454 mV (maximum), since the amplitude shown is a little bit less than 400 mV.

    I hope this helps clarify - please let me know if you have any other questions.

    Regards,
    Max