PURPOSE: To obtain optimum acquisition of synchronization locking and synchronization tracking characteristic by setting a pulling-in enable range wider than that of one delay lock loop at the time of pulling-in and providing the same characteristics as that of one delay lock loop in the tracking state.

CONSTITUTION: A switch 5 selects either a spread code A or B to act a delay lock loop as one delay lock loop or 2- delay lock loop. The spread code A is used to act the delay lock loop as 2- delay lock loop to widen the locking rage wider than a conventional 1- delay lock loop at the time of pulling-in just after an acquisition pulse is inputted. On the other hand, the spread code B is used to act the delay lock loop as 1- delay lock loop in the synchronization tracking state and to obtain the same synchronization tracking characteristic as that of the conventional 1- delay lock loop. Thus, the optimum acquisition of synchronization and synchronization tracking characteristic are obtained.