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LMH6552: Output Voltage Swing

Jacek Kupinski
Intellectual 360 points
Part Number: LMH6552

We noticed in the data sheet published the following parameter:

Output Voltage Swing (3) Differential Output min:14.8 typ:15.4 Vpp

when the power supply defined is +5V and -5V.

Is that possible?

  • 0
    TI__Genius 13935 points

    Hello Jacek,

    You read the datasheet correctly.  This is one of the primary benefits of a differential output amplifier.  If you look at each output separately you will see that the +-5V supply limitations are not violated.  When using the combined outputs the output swing is double that of each output separately. 

    Regards,

    Loren

  • 0 in reply to Loren Siebert 1
    Intellectual 360 points

    I still did get it a picture would be helpful. If out output is giving the signal up to 4V [in single ended mode] so it would provide the waveform between -4V to +4V. So the single ended swing would be 8V. If I would treat it as differential signal I would still observe 8V differential swing not 16V unless I am missing something.  So let me ask this question differently. I sense we need to divide the number published in datasheet by 2 to get the min of ~7.8V out of 10V power supply rail so gives me 2.2V [or 1.1V] head room away from the power rail - is that correct?

    Jacek

  • 0 in reply to Jacek Kupinski
    TI__Genius 15975 points

    Hi Jacek,

    You could think of the differential swing as double of the 8Vpp single-ended signal, because each output is phase-shifted by 180' with respect to each other. For example in the below image, each OUT+ and OUT- swings 2.5Vpp but are 180' phase shifted with respect to each other which results in 5Vpp(diff) total. The LMH6552 datasheet output swing spec refers to this differential output swing number.

    Best Regards,

    Rohit