INL error in a SAR ADC (10) is reduced by providing correction capacitors (11B) each having a first terminal connected to a conductor (13) which is also connected to one terminal of the capacitors of a CDAC (11A) and to an input of a comparator (5) of the SAR ADC. Stored INL error information (18A) is utilized to control switches (32) coupled to second terminals of the correction capacitors to selectively couple them to either a ground voltage (GND) or a reference voltage (VREF) in response to the stored INL error information so as to reduce the INL errors.