Part Number:PGA281
I'm looking for a fully differential amplifier with very low noise and band of interest .5-40Hz. The OPA1632 seems quit nice so far, but there is an issue of concern with lower frequency noise performance, The customer is particularly sensitive about not having an actual .1-10 Hz noise plot, since they say they have in the past been burned by amps that have good noise specs but are very bad below the range on the published graph.
Of course it's 1/f and you can just draw the line further to extrapolate lower frequencies, but apparently there are other sources of noise down there that cannot be estimated by the 6 sigma rule.
How should I interpret data sheet 1/f specs vs the 0.1-10Hz sec plots given with certain other amps? Is 1/f performance completely useless as a prediction of .1-10Hz noise?
Can I assume an auto zero amp (i.e. PGA281) will completely remove 1/f effect? I see from the spectral plot in the data sheet it seems this is so, but again no 10 sec time plot of .1-10Hz is given so it makes it a harder sell.
Does the auto zero function eliminate shot/popcorn/whatever noises in the .1-10 Hz band as well as 1/f?
Thanks.