A/D conversion apparatus and DC-DC conversion apparatus

An A/D conversion apparatus comprising:

• a first terminal to receive a reference voltage signal;
• a single-ended to differential converter configured to conduct single-ended to differential conversion on the reference voltage signal to obtain a first differential signal;
• an A/D converter configured to conduct A/D conversion on the first differential signal on the basis of the reference voltage signal to obtain a first digital signal;
• a digital circuit configured to detect a DC offset which is a difference between the first digital signal and a digital signal representing a predetermined code;
• a second terminal to receive an input signal;
• a converter configured to conduct DA conversion on the DC offset;
• and
• a subtraction circuit configured to subtract the DC offset subjected to the DA conversion from the input signal,
• wherein
• the single-ended to differential converter conducts single-ended to differential conversion on the input signal after the DC offset is subtracted to acquire a third differential signal,
• the A/D converter conducts A/D conversion on the third differential signal on the basis of the reference voltage signal to acquire a fourth digital signal, and
• the digital circuit outputs the fourth digital signal.