Image sensor including analog-to-digital converter connected to multiplexer and demultiplexer, and operation method thereof

Abstract

An image sensor including 'n' analog-to-digital converters (ADCs); a selection circuit that generates a selection signal indicating a target ADC and having k-bit size; an input demultiplexer that generates first to n-th enable signals each having 1-bit size, respectively; and an output multiplexer. The target ADC distributes digital bits of a target digital signal to some of the ADCs in response to a target enable signal corresponding to the target ADC. The “n” ADCs respectively output first to n-th multiplexing bits each corresponding to one of the distributed digital bits of the target digital signal or a dummy bit to the output multiplexer. The output multiplexer outputs the target digital signal based on a logical operation of the first to n-th multiplexing bits, k is an arbitrary natural number, and n is a natural number more than k and less than or equal to 2.