An amplifier circuit is configured to be preceded by a single-ended-to-differential translate circuit using a BTL configuration operating at a low voltage and succeeded by amplifiers to amplify output signals VOT and VOB from the single-ended-to-differential translate circuit. The amplifier circuit activates a mute function of the subsequent amplifiers during state transition when the single-ended-to-differential translate circuit turns on. Consequently, the amplifier circuit fixes output signals OUTP and OUTN to 0 V and masks an output noise. The amplifier circuit inactivates the mute function after signals VOT and VOB become stable. Thereby, the amplifier circuit is capable of easily preventing a pop noise using a BTL configuration requested for high voltage output to drive a piezoelectric actuator.