For Windows 10/11, the AD1981B is not natively supported. Use generic AC’97 drivers (e.g., Realtek AC’97) or legacy Analog Devices driver version 5.10.0.6300 in compatibility mode.
Provided relatively clean audio for its era. ad1981b driver
If you are putting together a system using this chip today, follow these steps to secure the right drivers: For Windows 10/11, the AD1981B is not natively supported
The AD1981B is an AC'97 2.3 compatible component designed for high-fidelity audio. Key hardware features include: For Windows 10/11