An analog-to-digital converter circuit comprises a first voltage comparator coupled to a first reference voltage and a signal voltage, the first voltage comparator having first negative and first positive outputs for outputting a comparison of the first reference voltage with the signal voltage; a second voltage comparator coupled to a second reference voltage and the signal voltage, the second reference voltage different than the first reference voltage, the second voltage comparator having second negative and second positive outputs for outputting a comparison of the second reference voltage with the signal voltage; and a first arrival time comparator coupled to the first positive output and the second negative output, the first arrival time comparator having a first arrival time comparator output for outputting a comparison of the first positive output with the second negative output.