A DA converting circuit comprises a first DA converter for outputting an analog voltage corresponding to a value of a digital input signal, and a calibration mechanism for generating a correction signal to cancel an offset related to a conversion operation by the converter. The selecting mechanism has: a common driving force outputting member; a plurality of force receiving members; a selecting member; and a position retainer for keeping the position of the selecting member. 5, whereof the polar constituent p is less than 15 Mpa0. The device further includes a phase-changeable material pattern adjacent the protrusion portion and a lower electrode electrically connected to the phase-changeable material pattern. These graphics software components detect the level of power management provided by the OS during system initialization, and self-configure such that an appropriate graphics power management scheme is in place for whatever level of power management is supplied\u2014or not supplied\u2014by the operating system.