Re: mystery dac
- From: Spehro Pefhany <speffSNIP@xxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 10 Apr 2006 17:51:15 -0400
On Mon, 10 Apr 2006 14:14:42 -0700, the renowned John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
I'm trying to reverse-engineer, or at least understand, an old hunk of
military electronics, part of an aircraft heads-up display. One part
on the schematic seems to be a 12-bit DAC with internal data latches.
The part number seems to be DAC871 or possibly DAC671; it's a bad scan
of a bad Xerox. Heck, there's a chance it's a DAC571.
It looks like a 24-pin package with D0..D11 on pins 1..12
respectively, and D0 looks to be the MSB!
The board was designed by GEC Avionics Ltd, so the dac may be furrin.
No luck so far from the usual suspects. Anybody got any leads on what
this might be?
John
Maybe check any old National data you have. The reverse bit numbering
is present, and some were also made by GEC Plessey with different part
numbers, but even my '84 databook doesn't have anything that matches
the pinout or part number.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
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- References:
- mystery dac
- From: John Larkin
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