“AD1981B: AC'97 SoundMAX® Codec”
Looks like 3-metal planarized CMOS around the 350 - 500 nm node. Minimum observed M1 half-pitch in analog logic is 750 nm, digital may be smaller.
Package
Die
Size is approximately 2730 x 3140 μm (8.57 mm2)
Map: http://siliconpr0n.org/map/ad/ad1981b/mz_neo10x/
Random analog logic
Die label
Random area of chip, focal plane on M3
Same area, focal plane on M1
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