1. An analog to digital converter (ADC) comprising: a switched capacitor array having a total capacitance value of C 2 ; a differential amplifier selectably configurable as either an operational amplifier or a comparator, said differential amplifier having first and second inputs and an output, wherein the first input is coupled to a reference voltage and wherein the switched capacitor array is coupled across the second input and the output of the differential amplifier; an input capacitor switchably coupled between the differential amplifier second input and an analog voltage source adapted to provide an analog voltage signal to be converted to a digital output signal, said input capacitor having a capacitance value of C 1 ; a successive approximation register coupled to the switched capacitor array and the differential amplifier output and configured to provide the digital output signal; and a logic signal generator configured to provide timing control logic signals to the other components of the ADC.