2 Replies Latest reply on Jan 16, 2014 5:34 PM by user_14586677

    PSOC 4 Datasheet

    user_14586677

      In the PSOC 4 datasheet the CM input range for SAR is stipulated as

         

      Vss to Vdda, should it be Vssa to Vdda ?

         

       

         

      Also in TRM no discussion mentioned if SAR is a R ladder solution. Reason

         

      I ask is the linearity specs are only speced for Vref >= 1 V, but if architecture

         

      is R ladder one would think much lower Vrefs would still experience the same

         

      linearity performance ? Or is this related to switch performance in the ladder

         

      mux to decision comparator ?

         

       

         

      Regards, Dana.

        • 1. Re: PSOC 4 Datasheet
          seg

          Dana:

             

          1. re VSS vs VSSA, you found a typo. It should indeed be VSSA as this agrees with the TRM and other documentation.

             

          2. The SAR ADC is not a resistive ladder, it a multiple-level switched capacitor type.

             

          ---- Dennis

          • 2. Re: PSOC 4 Datasheet
            user_14586677

            There is another problem in the datasheet, no mention in

               

            absolute max ratings the relationship between Vdda and Vdd

               

            nor Vssa and Vss.

               

             

               

            That should be added.

               

             

               

            Thanks seg.

               

             

               

            Regards, Dana.