The techniques described herein relate to overcurrent detection with multi-bit analog-to-digital converters (ADCs). An example apparatus includes a multi-bit analog-to-digital converter (ADC) configured to convert an analog signal into a multi-bit digital signal. The example apparatus further includes a threshold detector configured to generate an output signal indicative of an overcurrent condition after a detection of at least a first number of bits of the multi-bit digital signal satisfying a threshold.

An apparatus includes a plurality of analog-to-digital conversion units that performs analog-to-digital conversion using modulation by comparing a signal output from a plurality of pixels to a reference voltage; and a plurality of supply units that supply one of a plurality of different reference voltages to each of the plurality of analog-to-digital conversion units. The plurality of supply units supply different reference voltages to adjacent analog-to-digital conversion units among the plurality of analog-to-digital conversion units.