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how to make Envelope waveform in DRV2667?

Hyun-Sik Lee
Prodigy 30 points
Other Parts Discussed in Thread: DRV8662, DRV2667

I want to make envelope waveform in DRV2667(Fig 17)  using DRV8662.

 

I tried to find relevant documents, but i would not find it. 

Is it possible make envelope waveform using DRV8662?

And if it possible, I want to get some materials.

Thanks.

  • 0
    TI__Expert 8940 points

    Hi, Hyun-Sik:

    I don't have any documents about this.

    I think we can achieve this by the below example:

    1) route a differential DAC output to IN+/- of DRV8662

    2) use the DAC above to output a low level (not enough for Piezo) envelop waveform(for example, playback an envelop audio file), the DRV8662 can boost the input waveform from IN+/- to a high voltage level for Piezo.

  • 0 in reply to Peter Li79
    TI__Expert 3280 points

    Hello Hyun-Sik,

    Peter is correct. You can provide the DAC signal at the inputs and they will be gained up through the DRV8662 and output deferentially. So, if you would like the envelop waveform, you will need to create that desired signal and feed it into the DRV8662.

    Additionally, you can experiment with this on the bench by using a function generator.

    Let us know if you have any more questions.

    Best regards,

    Rodney Miranda

    Haptic Applications