From: "Ian Buckner"
Subject: Re: accurate fast opamps
Date: Fri, 15 Nov 2002 13:36:17 -0000
Organization: Agilent Technologies
NNTP-Posting-Date: Fri, 15 Nov 2002 13:36:18 +0000 (UTC)
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"Winfield Hill" wrote in message
> >John Devereux wrote...
> > Winfield Hill wrote:
> >> Thanks, John. I was hoping to elicite some newer parts, designed
> >> for use with lower supply voltages. Few legacy parts are spec'd
> >> or tested with +/-5V supplies, even if they may work well at low
> >> voltages, so it would make sense to choose a more modern part.
> > MAX410/412/414?
> Thanks, John, that looks like a nice opamp, have you used
> it before? GBW = 28MHz while drawing only 2.5mA is nice.
> But it doesn't fill the bill for me. Here's my spec again,
> . f_T faster than 5 MHz (more is better, 15MHz is nice)
> . Vos under 150uV typical (bipolar, right?) Ibias < 20nA
> . Oh, and operating from 13V total supply Dual miniDIP
> The LT1124 nicely exceeds the specs, but strictly speaking
> it's not specified or tested for operation at low supply
> voltages. Also it's a 10-year-old part, one wonders about
> the future availability. So I'm thinking about low-V parts,
> but not too low.
> Hmm, my 13V supplies are beyond the MAX412 12V max rating,
> 150nA bias current is too high, 250uV offset a bit high.
> Perhaps these are prices to be paid for its 28MHz rating.
> - Win
How about the OPA2227 or OPA2228?
8 or 33MHz, Vos typ 10uV, Ib typ 2.5nA max 10nA, rails +/-2.5V to
spec'd over those rail voltages as well.