This chip, who makes it and what’s it used for

I was cleaning out some junk when I encountered an interesting chip. It looks like a remnant from the Apollo space program with its all-metal body with the marking ADC581B 8533 6686. Next to the 8533, there's a company logo resembling a sine wave, which I initially mistook for the Texas Instruments logo. It's fairly large, around 1.5 to 2 inches long, with a noticeable heft for its size. There are 16 gold plated legs on each side.

I looked all over the web for a datasheet or any information on it, but couldn't find anything. The thought of it being some sort of radionuclide powered device and leading to another Goiânia briefly entered my mind. So far, however, no blue flashes or sparkles.

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