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digitally controlled three phase sine wave generation

shivakumar L V
Prodigy 90 points
Other Parts Discussed in Thread: DAC7734

hi

i m interfacing  DAC7734 with microcontroller(look up table) for three phase sine wave generation my concern is whether I can maintain Phase between three signals?

  • 0
    TI__Genius 10615 points

    Hello,

    It all depends on your requirements.

    • What frequency are your trying to generate?
      • How many points per period?
    • What resolution do you need from the signal?
    • How fast can you write to the DAC?
    • Do you want to allow the DAC to completely settle?
  • 0 in reply to Eugenio Mejia
    Prodigy 90 points

    hi Eugenio Mejia

    • What frequency are your trying to generate?----50Hz to 60Hz
    • How many points per period?----50 samples
    • What resolution do you need from the signal?---16BIT
    • How fast can you write to the DAC?----MAXIMUM 8Mhz SPI CLOCK
    • Do you want to allow the DAC to completely settle?----yes
  • 0 in reply to shivakumar L V
    TI__Genius 10615 points

    Thank you for the information.

    Short answer: Yes you can. With many more points too.

    I attached a quick calculation for your own reference.

    5037.DAC7734.xlsx

    You can play around with the clock to suit you needs.

    I found that for your application the minimum CLK should be 0.25 MHz.

     

    If you wanted to run this at max CLK would you want to update all the channels at the exact same time, of would you want to stagger them? This can change the timing scheme a little and with an 8MHz CLK you can achieve up to 10us writes per channel. (The tool does not show this because you have to do some optimization, if you are interested in this let me know and I can share some more details.)