An analog-to-digital converter (ADC) includes a loop filter having an input for receiving an analog input signal; a quantizer having an input coupled to an output of the loop filter, and an output for providing a digital output signal; and a digital-to-analog converter (DAC) having an input coupled to an output of the quantizer, and an output coupled to the loop filter, wherein the DAC includes at least one always-on DAC element, and a plurality of on-demand DAC elements.