Patent ID: 8730083

Claim:
An analog-digital converter comprising: a capacitor DAC including one or more capacitor elements having a capacitance value with binary weight, and a switch configured to switch a connection destination of the capacitor element, wherein at least one of the capacitor elements is connected to an input signal and generates an output signal corresponding to a connection state of the capacitor element by switching of the switch; a reference voltage generation circuit that supplies a reference voltage to the capacitor DAC; a comparator that outputs a comparison result in accordance with the output signal; a successive approximation register that outputs a digital signal in accordance with the comparison result of the comparator; and a control circuit that controls the connection state of the capacitor element in accordance with the digital signal, wherein the control circuit compares a conversion result, which is the digital signal obtained by sampling a predetermined voltage, and an ideal code, which is an ideal digital signal correspond to the predetermined voltage, and controls for performing correction for reducing error of the digital signal in accordance with this comparison result.