Sensor assembly and electrical circuit therefor

A microphone assembly comprising:

• a housing having a port and an external-device interface;
• a sensor disposed in the housing and configured to generate an electrical signal in response to sensed environmental conditions;
• an electrical circuit disposed in the housing and electrically coupled to contacts on the external-device interface,
• the circuit comprising a delta-sigma analog-to-digital converter (ADC) configured to generate a multibit digital signal based on the electrical signal, the ADC comprising a digital-to-analog converter (DAC) including a plurality of N selectably enabled current elements in a feedback path of the ADC;
• a control circuit coupled to the plurality of current elements and configured to adaptively activate one or more segments of current elements for a current sampling period based on a magnitude of a digital signal input to the DAC in a prior sampling period, wherein each active segment includes less than N current elements, each current element in the active segment is enabled and either contributes to a feedback signal of the DAC or does not contribute to the feedback signal, and current elements not in an active segment are disabled.