Analog-to-digital converter with interchangeable resolution and sample and hold amplifier channels

An analog-to-digital converter (ADC) with either 12-bit or 10-bit resolution and one or four input sampling channels, respectively, comprising:

• a capacitor area comprising a plurality of first capacitors and a plurality of second capacitors, wherein the plurality of first capacitors forms a part of a charge-redistribution digital-to-analog converter (CDAC);
• a plurality of switches adapted to configurable the plurality of first and second capacitors for either one or four sample channels, wherein some of the plurality of switches form another part of the CDAC;
• a comparator;
• a resistor digital-to-analog converter (RDAC);
• a successive approximation register (SAR);
• and
• a controller, wherein:
• selected ones of the plurality of first capacitors are coupled together to form either one or four sample, hold and convert capacitors having desired first capacitance values;
• selected ones of the plurality of second capacitors are coupled together to form either one or four sample, hold and convert capacitors having desired second capacitance values;
• some of the plurality of switches couple the selected ones of the plurality of first and second capacitors to one or more analog inputs, to the RDAC, and to the comparator;
• the plurality of switches couple the one or four sample, hold and convert capacitors to one or four analog inputs, respectively, and to the comparator;
• the SAR is coupled to the RDAC and the CDAC;
• and
• the controller and the comparator are coupled to the SAR.