[Object] To prevent code skipping in decoding.[Solution] Included are a low-order bit latch unit (63) that latches digital code data as a low-order bit, a high-order bit counter unit (64) that counts one or both of edges of a control signal corresponding to a reference clock, and stops counting of high-order bits, triggered by output of a comparator (62) being inverted, a low-order bit decoding signal latch unit (65) that latches a low-order bit decoding signal, and a signal processing unit (8).