Lots of pc's use the Analog Devices AD1881A chipset. Why not state what brand and model of pc and/or brand and model of motherboard that it came installed in and our job would be simple. But without that info, there's nothing we can do other than tell you to search our database for the chipset number.
Or.... Open Device Manager, find and double-click the sound device, click the Details tab, select "hardware id" and give me the hardware id string that begins with "PCI\VEN", (1st./top line of text only).