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Original question:

CCS/TMS320F28069: Using PWM Output as a Digital-to-Analog Converter Example Code

CCS/TMS320F28377D: Using PWM Output as a Digital-to-Analog Converter Example Code

lio messi
Expert 1185 points

Part Number: TMS320F28377D

Tool/software: Code Composer Studio

Hello

I have question about digital to analogue conversion using TMS320F28377D. As you know this version of DSP has a buffered DAC. I am a little confused! I wonder if somebody could let me know what is the difference between buffered DAC and PWM DAC. Is any output filter needed for reading analogue signals from buffered DAC?

regards

  • 0
    Guru 192875 points

    Hi,

    lio messi said:
    I wonder if somebody could let me know what is the difference between buffered DAC and PWM DAC.

    PWM DAC is nothing but generating a PWM signal (using ePWM module) with a specific frequency and then implementing a single stage or double stage RC on the hardware level. Modifying the duty of ePWM indirectly controls the amplitude of the RC filter output thus similar to the functionality of DAC.

    Buffered DAC is 12-bit programmable internal DAC module itself. Please refer Section 10 of TRM for more details.

    lio messi said:
    Is any output filter needed for reading analogue signals from buffered DAC?

    Nope.

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Expert 1185 points
    Hi Gautam Iyer
    Thanks for your reply
    So, there is no different between and PWM DAC and ePWM module? in other words, there is not any physical PWM DAC module exist unlike buffered DAC module?