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DRV135: Exit problem.

Sergey Tatunov
Prodigy 10 points
Part Number: DRV135

Why is it 3.18Vpp at the input, -3.18Vpp and +3.48Vpp at the output? What is causing the difference? The measurements were carried out without load.

  • 0
    TI__Mastermind 22010 points

    Sergey,

    Due to the non idealities internally on the device you will observe an output offset voltage amongst other parameters listed in the electrical characteristics table. There will be an offset associated with each amp shown below resulting in results on each output that are non-ideal. The results on each output will differ due to the difference in the offset observed on each path. Can you provide DC coupled oscilloscope captures of the input and both outputs? This should show the DC level that the signal is centered around on each measurement.  

    Best Regards,

    Chris Featherstone

  • 0
    Genius 3945 points

    The DRV135 needs to be driven by a low-impedance source like an op-amp output. If there's something like an analog switch or pot in front of it, the impedance of that switch or pot affects the input balance so you can get a DC offset in the outputs.