PURPOSE: To obtain a circuit attaining phase adjustment in the unit of a reciprocal of an integer part of a bit length with simple circuit constitution by adopting the constitution that an input data signal is written by a clock pulse having N-time (N is an integer being ≤2) of a bit frequency of the input data signal.

CONSTITUTION: The frequency of a write clock pulse (c) is selected twice of that of a bit clock signal (b) of a data signal (a) fed to a data input 102. When a control input 104 of an EX-OR 3 is logical '0', the clock pulse (c) becomes the clock input of a shift register 1 as it is, a data output shown in figure (d) is obtained for an output 105 of an FF 1a and a data output shown in figure (d) is obtained at an output 106 of an FF 1d. When the control input 104 of the EX-OR 3 is logical '1', the clock input of the shift register 1 is inverted (figure f), and a data output shown in figure (g) is obtained at the output 105 of the FF 1a and a data output shown in figure (h) is obtained at the output of the FF 1d. Thus, the phase is adjusted in the unit of 1/4 bit within the range of 2-bit length.