yet another op-amp question...
Archiver
Posts: 46,084
I'm looking for a filter for a high noise application and was sent a
simple introduction to filters.
The text describes the use commutating auto-zero (CAZ) op-amp, like
the MAX420CPA.
these puppies are expensive. almost $9.00 each, plus shipping. I
know Maxim has a great samples offer but I hate to rely on sample
lead times, it's been almost 3 months since I requested a MOSFET
driver chip...
Is there a less expensive alternative ?
Dave
simple introduction to filters.
The text describes the use commutating auto-zero (CAZ) op-amp, like
the MAX420CPA.
these puppies are expensive. almost $9.00 each, plus shipping. I
know Maxim has a great samples offer but I hate to rely on sample
lead times, it's been almost 3 months since I requested a MOSFET
driver chip...
Is there a less expensive alternative ?
Dave
Comments
out Murata-Erie for filters and filter information if you want to purchase
ready made ones. If you want to roll your own, the Amateur Radio Handbook
from the ARRL (arrl.com) has lots of info.
jim
http://www.geocities.com/jimforkin2003/
Original Message
From: Dave Mucha [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=g-i043uDcvhAZNevKMoeradnrKF2Ly4PzsA0u7qeTkVmfjhbOMkdMLTMRvP9Dl9BDGjis55V4HA]davemucha@j...[/url
Sent: Friday, August 29, 2003 11:37 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] yet another op-amp question...
I'm looking for a filter for a high noise application and was sent a
simple introduction to filters.
The text describes the use commutating auto-zero (CAZ) op-amp, like
the MAX420CPA.
these puppies are expensive. almost $9.00 each, plus shipping. I
know Maxim has a great samples offer but I hate to rely on sample
lead times, it's been almost 3 months since I requested a MOSFET
driver chip...
Is there a less expensive alternative ?
Dave
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>simple introduction to filters.
>The text describes the use commutating auto-zero (CAZ) op-amp, like
>the MAX420CPA.
>these puppies are expensive. almost $9.00 each, plus shipping. I
>know Maxim has a great samples offer but I hate to rely on sample
>lead times, it's been almost 3 months since I requested a MOSFET
>driver chip...
>Is there a less expensive alternative ?
>Dave
CAZ op-amps main claim to fame is low low DC offset. Does your
frequency band of interest go down to DC? If not, there are a lot of
non-CAZ op-amps that would be a lot cheaper. What is the bandwidth,
low and high frequency limits of your signal? What about the
extraneous noise source?
I often use the Linear Tech LT1051 ($5 each CAZ), and they are well
worth the price when DC accuracy is important.
-- Tracy