Audio Power Amplifier Ic and Audio System Provided with the Same

摘要

An audio power amplifier IC which is capable of suppressing degradation in sound quality resulting from the frequency of a reference clock, and an audio system provided with the audio power amplifier IC are provided. The audio power amplifier IC includes a clock generation circuit (10) generating an internal clock, a clock terminal (CLK) for outputting the internal clock or receiving an external clock, a clock selection circuit (11) selecting the internal clock or the external clock as a reference clock (BCLK), a first audio signal input terminal (IN1) for receiving a first audio signal (Lin), and a first digital power amplifier circuit (51) performing pulse modulation on the first audio signal (Lin) based on the reference clock (BCLK) to output a pulse synchronized with the reference clock (BCLK).