1. A low power analog-to-digital converter configured to sense sensor signals, comprising: a loop filter having a loop filter input configured to receive an input current signal from a sensor and generate an output signal responsive to the input current signal; and a feedback digital-to-analog converter having a feedback output configured generate one of a current-mode feedback output signal or a charge-mode feedback output signal responsive to the output signal, the feedback output coupled to the loop filter input in order to combine the input current signal and the feedback output signal at the loop filter input.