Internally Vs externally clocked isolated sigma-delta modulator

The sigma-delta modulators generate an output digital bit-stream data corresponds to the input analog signal. The output digital data has to be synchronised as much as possible the clock signal. The output data will then be sampled at the microcontroller at the same clock signal frequency for further filtering and decimation. 

For the first part of the video, we will show if the same microcontroller, an FPGA in this case, can correctly receive the output data from both types of sigma-delta modulators. For the second part of the video, we will compare the electromagnetic interference or in short, EMI, generated by the clock signal of both sigma-delta modulators.

ElectroNews explain more in the instructional video below