an equalizer that compensates for channel loss of input data;

a phase detector that compares a data output from the equalizer with a clock fed back from a voltage controlled oscillator and outputs an up signal and a down signal;

a charge pump that operates according to the up signal and the down signal and outputs a control signal;

a loop filter that removes high-frequency components included in the control signal output from the charge pump;

the voltage controlled oscillator that changes a frequency of the clock and outputs a clock with changed frequency according to the control signal from which the high-frequency components have been removed; and

a data phase adjuster that synchronizes the clock output from the voltage controlled oscillator and the data output from the equalizer by adjusting a phase of the data output from the equalizer by receiving the up signal and the down signal output from the phase detector.