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Original question:

PGA970: PGA970 - PGA970EVM - Memory

PGA970: PGA970 Waveform Generator DAC -Memory

Andreas Haas70
Prodigy 85 points

Part Number: PGA970

Hello,

I would like to generate a waveform which depends on the measured input Voltage of a ADC. In this case I want to know if it is possible

to use the DAC of the Waveform generator independent from the look up table, or if it is possible to change the values of the LUT on the fly, to create the output value of the 

waveform generator.

regards,

A.

  • 0
    TI__Mastermind 31655 points
    Hello A,

    Unfortunately it is not possible to change the values of the LUT on the fly. You would have to stop the waveform generator, load new values into the LUT, and then start it up again.

    What is your goal with the waveform? Are you trying to adjust the frequency based on the voltage, or change the amplitude?

    If it's the former, the only option would be what I described above. If it's the latter, you could do this in the firmware of the internal M0 to adjust the output gain of the waveform generator.

    Regards,
  • 0 in reply to Scott Cummins
    Prodigy 85 points
    Hi,
    I'm not using the PGA970 with a LVDT Sensor. I would like to supply two resistive bridges where one element of the bridges is a thermoelement ( needs 0 -10 mA). To keep these Thermoelements on a konstant temperature i need to regulate the bridge supply voltage via DAC. For one bridge i would use the Output DAC and for the other i would use the waveform generator. The Bridge Supply is not perodic. So is it definitly not possible to write directly to the DAC value register in the Waveform generator?

    There would be another way. Is it possible to generate a PWM Signal on the GPIO Pins?

    Regards,
    A