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Reply-To: "Jeff Stout"
From: "Jeff Stout"
Subject: Re: CMMR op amp outside voltage rails ?
Date: Wed, 4 Dec 2002 18:57:00 -0600
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
An Instrument Amplifier can probably do everything you need. Analog devices
makes the some choice Instrumentation Amplifiers:
see about half way down:
s/inamp.html Burr-Brown also makes a few selections:
d=233&templateId=3&dlId=2 then go down to Instrument Amplifiers and select
We use the INA117 and have been very happy with it.
Gibbo wrote in message
> I have simulated and breadboarded (they almost agreed !) an amplifier that
> need with the following specs:-
> Differential voltage input of -60mV to +60mV
> This could be sitting on an offset between -5 volts to +50 volts
> Available power supply is a single rail 5 or 6v (not yet decided)
> Gain of 50 and 500 (switchable)
> Bandwidth DC to 1KHz
> Gain accurancy better than 1%.
> Offset accuracy less than 0.05 volts on the output.
> Temperature/time drift of offset is not such an issue as the micro
> calibrates for this. Though of course it would be nice to remove this
> My solution uses 3 op amps. One of them to remove the offset on the input.
> as the differential amp, and one for the gain There has to be a less
> complicated way.
> I bet there's a single package that will do it all ?
> Ideas ?
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