Provided are a semiconductor device and an operating method thereof.The semiconductor device includes a mode controller configured to output a first control signal in a first communication mode, and output a second control signal in a second communication mode which is different from the first communication mode; and a configurable circuit configured to generate a first output signal to be transmitted to a first type analog-to-digital converter (ADC) in the first communication mode, and generate a second output signal using a second type ADC in the second communication mode, wherein the configurable circuit comprises a switching circuit configured to change a circuit configuration to a first circuit configuration for generating a first output signal in the first communication mode or to a second circuit configuration for generating a second output signal in the second communication mode, depending on the first control signal or the second control signal received from the mode controller.