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HT6819 is an internal integrated 32-step digital volume control, ultra Low-EMI, Anti-Clipping stereo Class D audio power amplifier IC with maximum output power of 3.3W, providing high quality performance which compare favorably with AB class Amplifiers while the efficiency is much higher.HT6819 has excellent EMI radiation suppression characteristics with AROC technology integrated, and is well below the FCC Part15 Class B standards without any filters (with a 20cm wire connecting to the speakers).HT6819 features Anti-Clipping Function (ACF) which detects output signal clip caused by the over input signal or the voltage drops from battery, and suppresses the output signal clip automatically. It can significantly improves the sound quality, creating a very comfortable musical enjoyment, and to protect the speakers from overload damage. In addition the sound quality and output power can be freely set by external resistance or capacitance of ACRC.HT6819 also supply ACF OFF mode.HT6819 has a “Pure Pulse Direct Speaker Drive Circuit” which directly drives speakers while reducing distortion of pulse output signal and reducing noise on the signal, and realizes the highest standard low distortion rate characteristics and low noise characteristics among digital amplifier ICs for portable use.HT6819 has the independent Shutdown function which can minimize the power consumption at standby and MUTE function. As for protection function, over current protection function for speaker output terminals, over temperature protection function, and low supply voltage malfunction preventing function are also prepared.HT6819 is available in Pb-Free TSSOP-20 package.