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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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REQ: pinout for AD550
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 manufactu 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 |
#2
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REQ: pinout for AD550
On Thu, 16 Oct 2008 20:12:07 -0500, "Matt J. McCullar"
put finger to keyboard and composed: 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 manufactu 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 I believe that device may have been the subject of US patent number 3747088: http://www.google.com/patents?id=pb5...is=2008&num=20 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 -- Please remove one 'i' from my address when replying by email. |
#3
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REQ: pinout for AD550
Matt J. McCullar wrote:
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 manufactu 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 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 diagram/pinout. http://www.jetecnet.com/ad533/ |
#4
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REQ: pinout for AD550
Archon wrote:
Matt J. McCullar wrote: 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 manufactu 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 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 diagram/pinout. http://www.jetecnet.com/ad533/ Sorry, make that AD553, not AD533, not enough coffee this morning. JC |
#5
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pinout for AD550
Thanks very much for the help, group! That all helps a lot. I do
appreciate it! Matt J. McCullar, KJ5BA |
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