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Now you just need to link to the correct posting (a search for ADCDelSig on psocdeveloper yields nothing suitable).
As you can see in ADC component configuration window, input range of ADC is Vin- - Vref to Vin+ + Vref. So if you bias your input time varying signal to a DC voltage >= Vref, then you will get the complete dynamic range of ADC. Otherwise, your input range will get shortened. That is why you can see the VDAC constant reference voltage to the -ve Input of ADC.