The C-Media CM6533 is a USB 2.0 audio chip with a built-in 8051 microcontroller, ideal for headsets, docking stations, and speakers. It supports USB Audio Class 1.0, features stereo ADC/DAC, S/PDIF output, and a 5-band equalizer. With 256KB flash memory, integrated crystal, and HID support, it reduces BOM costs. The CM6533 offers plug-and-play compatibility across major platforms, making it a flexible, cost-effective solution for modern USB audio applications.