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Help- PGA280

SciMan
Prodigy 90 points
Other Parts Discussed in Thread: PGA280

I was going  through the data sheet of PGA280.  On page 15, Fig. 37, Fig. 38 and Fig. 39, the curves show that the output swings to 8 V. However, as per the test conditions on the top of that page, the VSON = 0 V and VSOP = 5 V. Does this mean that the output swings more than the power rails (in this case, more than VSOP) ?. In such a scenario, how can one use this for a 0-5V ADC ?. Do one need to clamp the output at 5 V with diodes ?.

Thanks,

-SM

  • 0
    TI__Guru* 95205 points

    I just noticed that this question had not been answered. Sorry about the delay.

    I believe that the curves reflect the fact that the output is fully differential and that VSON and VSOP go from 0V to 5V respectively.

    In the case of a swing of 8V, the swing goes from +4V to -4V.  At the most positive, VOP=4.5V and VON=0.5V; while at the most negative, VOP=0.5V and VON=4.5V. The VOCM is set to 2.5V.

    Joseph Wu

  • 0 in reply to Joseph Wu
    Prodigy 90 points

    Thank you for the reply. That makes sense. It would be nice to have this information updated in the next release of documentation though.

     

  • 0 in reply to SciMan
    TI__Guru* 95205 points

    No problem.

    I've passed your comment about the datasheet back to the development group.

    Joseph Wu