Abstract: The present invention provides an isolated analog-to-digital converter system including an analog-to-digital subsystem including an analog-to-digital converter for converting an analog signal to a digital control stream. A microcontroller subsystem provides power, clock signals, and control signals as a single combined signal for the analog-to-digital converter, the single combined signal comprising a pulse train having a nominal frequency and having control pulse width modulated thereon. An isolation subsystem electrically isolates the analog-to-digital converter subsystem from the microcontroller subsystem. The isolation subsystem includes a first transformer, coupled to the microcontroller subsystem, which receives the single combined signal as a differential input signal. A full-wave rectifier, coupled to the first transformer, rectifies the differential input signal to produce at least one power supply voltage for the analog-to-digital converter subsystem.