Instrumentation amps
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Posts: 46,084
There are some precision, low-noise chips and modules designed specifically
for instrumentation amps, but I can't remember the numbers. We used
Burr-Brown modules on the oilfield stuff I used to work on.
Do a search in Yahoo for PRECISION OP-AMP and you should get quite a few web
matches.
Original Message
> If I wanted to measure pressure using several pressure sensors, then I
would need an instrumentation amp for each sensor. What would be the easiest
way to connect them to my a/d converters using the least amount of hardware?
The last one I made used several op amps which consisted of two chips and
some pots and a bunch of perfect resistors. Do they have this in an IC
package?
for instrumentation amps, but I can't remember the numbers. We used
Burr-Brown modules on the oilfield stuff I used to work on.
Do a search in Yahoo for PRECISION OP-AMP and you should get quite a few web
matches.
Original Message
> If I wanted to measure pressure using several pressure sensors, then I
would need an instrumentation amp for each sensor. What would be the easiest
way to connect them to my a/d converters using the least amount of hardware?
The last one I made used several op amps which consisted of two chips and
some pots and a bunch of perfect resistors. Do they have this in an IC
package?
Comments
amps with 4 precision resistors configured to make a unity gain difference
amplifier. The resistors are 25K ( if I remember correctly ). If you need
higher input impedance or gain, try an INA121. I've had good luck with them.
Mike
At 10:25 AM 10/9/2001 -0500, you wrote:
>There are some precision, low-noise chips and modules designed specifically
>for instrumentation amps, but I can't remember the numbers. We used
>Burr-Brown modules on the oilfield stuff I used to work on.
>
>Do a search in Yahoo for PRECISION OP-AMP and you should get quite a few web
>matches.
>
>
Original Message
>
> > If I wanted to measure pressure using several pressure sensors, then I
>would need an instrumentation amp for each sensor. What would be the easiest
>way to connect them to my a/d converters using the least amount of hardware?
>The last one I made used several op amps which consisted of two chips and
>some pots and a bunch of perfect resistors. Do they have this in an IC
>package?
>
>
>
>
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_________________________________
Mike Walsh
walsh@i...
[noparse][[/noparse]Non-text portions of this message have been removed]
need an instrumentation amp for each sensor. What would be the easiest way to
connect them to my a/d converters using the least amount of hardware? The last
one I made used several op amps which consisted of two chips and some pots and a
bunch of perfect resistors. Do they have this in an IC package?
[noparse][[/noparse]Non-text portions of this message have been removed]
differential FET inputs which means that you can use large input
resistors. I use them with 1 Mohm input resistors. You can also include
components for low-pass filtering at the input, as shown in the BB ap
notes. If you don't need the large input impedance of FET inputs,
Burr-Brown has a series of INA1-- chips with lower input impedance.
Dennis
On Tue, 9 Oct 2001, Mike Walsh wrote:
> I think you're looking for the Burr Brown INA105 . They are precision op
> amps with 4 precision resistors configured to make a unity gain difference
> amplifier. The resistors are 25K ( if I remember correctly ). If you need
> higher input impedance or gain, try an INA121. I've had good luck with them.
> Mike
>
> At 10:25 AM 10/9/2001 -0500, you wrote:
> >There are some precision, low-noise chips and modules designed specifically
> >for instrumentation amps, but I can't remember the numbers. We used
> >Burr-Brown modules on the oilfield stuff I used to work on.
> >
> >Do a search in Yahoo for PRECISION OP-AMP and you should get quite a few web
> >matches.
> >
> >
Original Message
> >
> > > If I wanted to measure pressure using several pressure sensors, then I
> >would need an instrumentation amp for each sensor. What would be the easiest
> >way to connect them to my a/d converters using the least amount of hardware?
> >The last one I made used several op amps which consisted of two chips and
> >some pots and a bunch of perfect resistors. Do they have this in an IC
> >package?
> >
> >
> >
> >
> >To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> >from the same email address that you subscribed. Text in the Subject and
> >Body of the message will be ignored.
> >
> >
> >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
> _________________________________
> Mike Walsh
> walsh@i...
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
>
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>
>
differential (piezo resistive bridge) type transducers. Parts count
is very low. LM11 may be hard to find, OP-07's are everywhere.
regards
rich
--- In basicstamps@y..., "Ricky Konvicka" <ricky@m...> wrote:
> If I wanted to measure pressure using several pressure sensors,
then I would need an instrumentation amp for each sensor. What would
be the easiest way to connect them to my a/d converters using the
least amount of hardware? The last one I made used several op amps
which consisted of two chips and some pots and a bunch of perfect
resistors. Do they have this in an IC package?
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]