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

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.

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/

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

Thanks very much for the help, group! That all helps a lot. I do
appreciate it!

Matt J. McCullar, KJ5BA