What purpose did Texas Instruments build factories in several countries doing the same. (Korea, Japan, Malaysia)?. I suppose they don't have its own factory at all.
They simply order their DACs in varies factories choosing the best offer. (the cheapest).
I think there is no quality standard. This is my opinion only. I may be wrong.
TI owns the specs for the product, they survey the world for a chip maker who can produce the chips in the amount required "to spec" for the least amount of money.
However all products, from burgers to hotdogs to volume knobs are made with quality. No quality specs = you turn a product on and it might work, or blow up or who knows what.