A source driver includes an equalizer which outputs compensated image data by adjusting a frequency gain of image data, based on a selected option value among a plurality of option values. A recovery recovers a clock signal corresponding to the compensated image data. A calibrator sequentially provides the plurality of option values to the equalizer, and selects the selected option value among the plurality of option values, based on recovery rates of the clock signal, which respectively correspond to the plurality of option values.