1. An analog-to-digital converter (ADC), comprising: a comparator array, the array comprises a plurality of comparator blocks, each block comprising a primary comparator and an interpolating comparator, the interpolating comparator comparing an output signal from the primary comparator with a negative output signal from a primary comparator of another block of the plurality of blocks to generate a least significant bit; and a binary converter, coupled to the array, that converts array output to binary code.