The Cirrus Logic CS8409 is an audio interface controller chip designed by Cirrus Logic, Inc. Cirrus Logic is a semiconductor company that specializes in audio and voice signal processing solutions for a wide range of applications, including smartphones, tablets, laptops, headphones, and other consumer electronic devices.

The CS8409 is specifically used as an audio controller for USB-C audio devices. It provides the necessary functionalities to handle digital audio data and facilitate audio communication between USB-C audio peripherals, such as headphones, speakers, and microphones, and the host device (e.g., a smartphone or a computer).

With the increasing adoption of USB-C as a versatile connector, the CS8409 plays a crucial role in ensuring proper audio communication and providing high-quality audio experiences in USB-C audio devices. It supports various audio features, such as sample rate conversion, digital audio processing, and microphone array processing, contributing to a seamless and immersive audio experience for users.