This is a very old chip by Analog Devices, came out in the early 1970s. It's a four-bit current selector in a DIP package. You add your own resistors to make it a full-fledged current-output digital-to-analog converter, and in fact you can daisy-chain two or more of these chips together to made an 8-bit DAC or a 12-bit DAC, ad infinitum. Of course, this chip is hopelessly obsolete now and all I want to do is test a handful of these things. I have a datasheet (of sorts) from Analog Devices, but unfortunately it tells me everything except what I really need: the pinout of the chip! I had a copy of that datasheet gathering dust on the shelf, and it wasn't quite as helpful as I needed, so I called Analog Devices. They were very helpful and said they'd scan a copy of their datasheet and make a .PDF of it and e-mail it to me. This they did, and I am very grateful. Only problem is, it's an exact copy of the datasheet I had to begin with, and it does not include the pinout. I figure if the manufacturer doesn't have this info anymore, it's time to yell for help.
Details:
Manufacturer: Analog Devices Date of manufacture: early 1970s Part number: AD550 Description: Four-bit current selector
Needed: pinout so I can bench-test a handful of these things to verify their proper operation
Anybody got this information on papyrus or chiseled into stone anywhere? I'd be much appreciative. :)
Thanks!!!
Matt J. McCullar, KJ5BA Arlington, TX