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REQ: pinout for AD550

Discussion in 'Electronic Repair' started by Matt J. McCullar, Oct 17, 2008.

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  1. 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.


    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. :)


    Matt J. McCullar, KJ5BA
    Arlington, TX
  2. Franc Zabkar

    Franc Zabkar Guest

    I believe that device may have been the subject of US patent number

    See page 5 of the PDF document for a circuit diagram.

    Devices 10A, 10B, 10C are the quad switches. Whether they match the
    pinout of the AD550, I don't know.

    - Franc Zabkar
  3. Archon

    Archon Guest

    Hi, I don't know if this is of help, in my D.A.T.A book (1980) the
    pinout for the AD550 is listed but not the pinout, but the AD533 , which
    appears to be a similar device with higher dissapation has a logic
  4. Archon

    Archon Guest

    Sorry, make that AD553, not AD533, not enough coffee this morning. JC
  5. Thanks very much for the help, group! That all helps a lot. I do
    appreciate it!

    Matt J. McCullar, KJ5BA
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