.The HT66F007 is an 8-pin SOP-150mil RoHS compliant integrated circuit manufactured by Holtek. It is designed to provide an efficient single-chip digital audio solution for embedded systems. It features integrated audio codec, 192 kHz sample rate audio ADC and DAC with less than 0.01% THD+N, 32-bit digital audio effects, 32/48 bit audio DSP core, 200MIPS coding engine, non-overlapping PWM outputs, adjustable headphone amplifier, I2C, I2S, S/PDIF protocol transceiver, UART interface, and user-programmable GPIO pins. The HT66F007 enables users to design a low-cost digital audio platform with both advanced digital audio features and time-tested analog sound quality. It is suitable for a variety of applications including digital audio players, USB speakers, home stereo systems, and portable digital audio players.