REQ: pinout for AD550

M

Matt J. McCullar

Guest
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
 
On Thu, 16 Oct 2008 20:12:07 -0500, "Matt J. McCullar"
<mccullar@flash.net> 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 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
Click to expand...
I believe that device may have been the subject of US patent number
3747088:
http://www.google.com/patents?id=pb58AAAAEBAJ&dq=patent:3747088&as_drrb_ap=q&as_minm_ap=1&as_miny_ap=2008&as_maxm_ap=1&as_maxy_ap=2008&as_drrb_is=q&as_minm_is=1&as_miny_is=2008&as_maxm_is=1&as_maxy_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 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



Hi, I don't know if this is of help, in my D.A.T.A book (1980) the
Click to expand...
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 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



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

Matt J. McCullar, KJ5BA
 
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