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From: firstname.lastname@example.org (Rileyesi)
Date: 24 Sep 2002 03:36:24 GMT
Organization: AOL http://www.aol.com
Subject: Re: Current Feedback Amp Questions
>> I am working on a project and an engineer from Linear Technology suggested
>> I use a LT1210 Current Feedback Amplifier. I've used 'run of the mill'
>> feedback op amps, but have never used the current feed back style.
>> The only downside I could see from the datasheet is that the performance
>> current feedback dedvice depends greatly on the output conditions (i.e.
>> resistive load and load capacitance). He said that it affects mostly the
>> bandwidth. I am handling only regulated, slow moving DC signals, so I
>> not be too concerned with bandwidth. True??
>> Any other problems with this type of device that I am not aware of??
>Why did LT recommend a current-feedback opamp if you don't need the speed?
>If you have to use one then be aware of their minimum gain limits.
Thanks for the reply.
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
Should I trust the LT engineer?!?
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