Analog to digital converter

An A/D converter for converting an analog signal into a digital signal, comprising:

• an input unit configured to receive an analog input signal;
• a preprocessing unit configured to convert the input signal into a digital preprocessing signal based on a dynamic range of the input signal and a first resolution corresponding to a predetermined first bit number;
• a first conversion unit configured to convert the preprocessing signal into a first output signal based on a second resolution corresponding to a second bit number smaller than the first bit number;
• a second conversion unit configured to convert the preprocessing signal into a second output signal based on a third resolution corresponding to a third bit number which is smaller than the first bit number and is different from the second bit number;
• and
• an output unit configured to output at least one of the first output signal and the second output signal.