CJC8910 is a low-power and high-quality codec, which is specially designed for portable digital audio applications. The chip integrates a complete interface to a monophonic earphone or power amplifier. Because there is no need for a separate earphone amplifier, the requirement for external components is greatly reduced. Advanced on-chip digital signal processing performs automatic level control of audio equalizer, microphone or line input. CJC8910 can operate as a master or a slave, and has various master clock frequencies, including 12MHz or 24MHz for USB devices, or standard 256fs frequencies such as 12.288MHz and 24.576MHz. Different audio sampling rates (such as 96kHz, 48kHz, 44.1kHz ...) can be directly generated by the master clock without an external phase-locked loop.