From: Fred Bloggs
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Subject: Re: Current Feedback Amp Questions
Date: Thu, 26 Sep 2002 12:12:41 GMT
NNTP-Posting-Date: Thu, 26 Sep 2002 05:12:41 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
> They suggested that part because of the high current output (1.1 A). The gain
> I need is only 1 or 2, so the minimal gain limit won't be a problem.
> The other device I was looking at was the Burr Brown OPA547 which is about the
> same price as the LT1210 but can deliver only 0.5 A. I have an application
> where I will need to deliver between 0.2 and 0.6 A depending on the specific
> installation. I'd like to use the LT1210, but am concerned about the
> sensitivity to the loads.
> To be more specific, the system I am designing will drive analog indicators.
> At some sites there is only one indicator but at others, there are as many as
> seven. Some sites have a few feet separating the displays while at others,
> they may be three floors apart with thin (lilke 24 gage) wires connecting them.
> In other words, the system will see a variety of resistive and possibly
> capacitive loads.
Are you driving these indicators with current or voltage, or do you know
the difference. Whatever, the Nationla Semiconductor LM675 would be the
part to use, a single chip fully protected, solution at low cost, except
from Digi-Key, but still 25% of the LT and BB candidates which will be
layout sensitive among other things.