2 Replies Latest reply on Jan 16, 2014 5:34 PM by DaKn_263916

    PSOC 4 Datasheet


      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



          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

            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.