On Wed, Apr 14, 2004 at 10:29:19AM -0800, Tinco Brouwer enlightened us
thusly
> Declan Moriarty wrote:
>
> >Can anyone give me anything on this? I thought I actually had a
> >datasheet, but (NOT!)freetradezone had mixed it for the upc2722C. I
> >found a UPC272C in a very humble little driver board, and was thrown
> >nicely for a few minutes :-/. FYI, the uPC is a 'Silicon MMIC
> >Frequency Converter' boasting they are 'L-Band Frequency converters
> >(2.8 ghz) using the Nesat III process", and with converters, VCOs,
> >and other technological gobbledygook being thrown around like snuff
> >at a wake.
> >
> >
> >I think it's a quad opamp like the lm324, but I'd like to be sure.
> >Mebbe actually the LM224 - industrial temprature. None of the other
> >crap anyhow .
> >
> >
> >
> uPC272C? Is this a 14 pin DIP?
How gross of me to omit the package. Yes - 14 pin DIP
>
> If so, it can be found in the famous japanese databook collection...
I'd like a handle on that famous japanese databook collection if it
doesn't cost an arm and a leg... Have you a url for it?
>
> There it is described as a dual comparator:
> 3 A GND
> 4 A+ in
> 5 A- in
> 6 V-
> 7 B out
> 8 B GND
> 9 B +in
> 10 B -in
> 11 V+
> 12 A out
> other pins NC.
> Output is open collector (needs pull up).
>
> Regards, Tinco Brouwer.
Drats! I was codded by this small board then.
It had one wide track to pin 4, and another to pin 11, and I took them
for + and - but in fact they were + and +!
Evidently, the 2 comparators are separately powered, and the board was
only powering one (The other must powered off board). So I confused
myself totally by looking up the legs with an analogue signature
analyser, no knowing I only had half the chip earthed :-/. It read
remarkably symmetrically. Anyhow, it is fortunately returned and the
fault found elsewhere.
--
With best Regards,
Declan Moriarty.
--
Author: Declan Moriarty
INET: [EMAIL PROTECTED]
Fat City Hosting, San Diego, California -- http://www.fatcity.com
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB CHIPDIR-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
