18 Jan
2010
18 Jan
'10
3:59 p.m.
From: cclist at sydex.com
To: cctalk at classiccmp.org
Date: Sun, 17 Jan 2010 10:33:35 -0800
Subject: RE: power supply problem
On 17 Jan 2010 at 10:15, dwight elvey wrote:
Hi
I suspect that Lambda wanted to take advantage of two things.
2.5 volts is a typical output of a band-gap reference and the
lower voltage meant that two less resistors were needed for
voltages below 7 volts.
I believe the original 723 design used zeners as references
and these are a little more process dependent than the band-gap
that depends more on physical geometry.
It would have been nice if they used another name, something
like 723-2.5.
Dwight
_________________________________________________________________
Hotmail: Free, trusted and rich email service.
http://clk.atdmt.com/GBL/go/196390708/direct/01/
It has a trangle with a lamda in it.
The part number is: LAS 723
Date code: 7813
A quick search turns up that the LAS723 does indeed have a Vref of
2.5v. datasheetarchive.com has the data sheet.
Never heard of this one before.
--Chuck