Patent ID: 8669895

Claim:
An analog-to-digital conversion device comprising: a comparator including an input circuit for receiving a complementary input signal to generate an inversion complementary signal having the inversion logic of the complementary input signal, and a latch circuit for latching the inversion complementary signal; a comparative operation control circuit including a first switch for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a first signal, and a second switch for connecting or disconnecting the latch circuit and the input circuit to or from a high-potential power source according to the logic of a second signal; a delay circuit for outputting the first signal and the second signal; a successive operation control circuit for outputting a control signal for controlling the period of logic change of the first signal for controlling disconnection of the first switch, and the period of logic change of the second signal for controlling disconnection of the second switch, based on the logic of a signal latched by the latch circuit.