3 Replies Latest reply on Jul 29, 2020 10:45 PM by VasanthR_91

    Sensibility of ADC SAR PSoC 4

    OsFe_2822791

      Hello,

       

      Does anyone know which is the sensibility of ADC SAR in PSoC 4? I mean, the minimun value of signal thich can convert the ADC.

       

      Thank you.

       

      Regards.

        • 1. Re: Sensibility of ADC SAR PSoC 4
          VasanthR_91

          Hi Oscar,

           

          PSoC SAR ADC resolution will be Vref/2^n, wherere n is the no, of resolution bits. Even though the Vref value can be any value greater than zero on component configuration, all the specifications guaranteed in the datasheet are up to a minimum voltage of 1.024 V. So this is will set the sensitivity of the ADC  around 1mV. With averaging to some extend you can attain somewhat higher resolution. Above all this you have to make sure that you have to make sure to the complete range of the ADC(in single ended mode if Vneg is connected to VSSA, it is not possible- resolution reduced to 11 bits.)

           

          Best Regards,
          Vasanth

          • 2. Re: Sensibility of ADC SAR PSoC 4
            OsFe_2822791

            Hi ,

             

            thank you for your response. In other hand, do you know if there´s a maximun value to convert?

             

            Thank you,

            regards.

            • 3. Re: Sensibility of ADC SAR PSoC 4
              VasanthR_91

              Hello Oscar,

               

              The maximum value you can convert is dependent upon the ADC input range of operation. This will depend on the Vref you have chosen and where the negative input of the ADC is connected. Check the component datasheet for following table.

               

              Over all this the hard limit on the input is the device maximum and minimum voltgae, which VDDA and VSS. Any voltage outside this may not be directly measured.

               

              Best Regards,
              Vasanth