PSN-L Email List Message

Subject: Re: Op amp front end noise
From: akr@.........
Date: Wed, 9 Mar 2005 21:30:44 -0800 (PST)

John and all others -

I would add the quad OP-400 to the list.  It is essentially a low power
quad OP-07/77.  It also has the added advantage of being able to drive
large capacitive loads - I use it as a driver for the long cable run
leading from my seismograph to the AtoD card in my computer in addition to
using it for amplifying and filter applications.  The data shows the
OP-400 driving a 1nF load without oscillation - I took the picture when
writing the OP-400 data sheet in my previous career in new product
development and applications at PMI/ADI (we were bought out by ADI in


> I am getting pretty deeply into the design process for a velocity coil
> seismometer amplifier and filter and have decided to try ot quantify
> the relative noise performance of various candidate opamps versus coil
> resistance.  Here is the list of low noise and general purpose types
> (which I have on hand) that I am comparing:
> AD706
> AD708
> AD820
> AD822
> ICL6750S
> LF411
> LMC6062
> LMC6462
> LMC6482
> LT1007
> LI1115
> LT1124
> LT1128
> LT1677
> LT1047
> LTC1051
> LTC1151
> MAX400
> MAX410
> MAX420
> MAX427
> MAX430
> MCP6022
> OP07
> OP177
> OP2604
> OP27
> OP97
> Do you have any suggestions for other candidates I might evaluate?
> My biggest difficulty in completing this task has been resolving the
> wide variation in noise specifications for the various types to
> produce a valid comparison in the DC to 10 Hz frequency range,
> especially comparing the chopper types to the others.
> --
> John Popelish
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