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ADC Vccad, Vssad, ADREFHI, ADREFLO

matteo lucarelli
Genius 3265 points

Hi

I'm working with a TMS570HDK and have started digging a bit in the ADC function.

Vccad/Vssad are described as "ADC power supply" but I cannot found more information about. Do the HDK connect this internally? Why my ADC works if I haven't connected these? Can be leaved unconnected? So What's their function?

ADREFHI and ADREFLO are supposed to be used only for ADC calibration? Do this calibration is really required? Do the HDK make some connection on these too?

Thank you

  • 0
    TI__Mastermind 22375 points

    Matteo,

    Vccad and Vssad are the dedicated power and ground for the ADC module (Analog core only)
    Vrefhi and Vreflow are the reference voltage used during conversion. They are required.

    On the HDK we have the following connections:

    Vccad and Vrefhi are by default connected to 5V
    Vssad and Vreflow are connected to analog ground.

    Using J8 (2 pins jumper, off by default) it is possible to change the configuration to:

    Vccad and Vrefhi are 3.3V
    Vssad and Vreflow are connected to analog ground.

     So in your application, if your analog input signal are in the range 0 to 5V you can use the default option. (J8 off)
    If your analog input voltage are in the range 0 to 3.3v than you can populate J8.

    Please let me know if I've answered your questions.