From: John Larkin
Subject: Re: accurate fast opamps
Date: Wed, 13 Nov 2002 20:06:46 -0800
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On 13 Nov 2002 18:59:58 -0800, Winfield Hill
>Winfield Hill wrote...
>> Let's talk about our favorite fast accurate opamp, in this case
>> I'm calling out f_T faster than 5 MHz, Vos under 150uV typical
>> (bipolar, right?), Ibias < 20nA. Oh, and operating from 12.5V
>> total supply. :-) Is your favorite choice up to the task?
> Bill Sloman wrote me pointing out the joys of the 20-year-old
> LT1007 and LT1037 opamps, or even the venerable OP-27 and OP-37
> chips. These parts would indeed appear to fill my need, if I
> can trust their 30V supply specs to be trustworthy at 10V total
> supply voltage. The older OP-27 data sheet says very little
> about operation below +/-15V, not giving me much guidance. But
> the LT1007 has curves showing specs down to below +/-3V supply,
> including constant Ig curves, which inspires confidence. They
> also have output drive capability shown as a voltage difference
> from the supply rails, very important data.
> But sadly, I left out an important parameter for me, this must
> be a dual opamp. I'd like a dual miniDIP LT1007... Ah, Linear
> Technology's LT1124 looks good.
> Good call Bill. :-)
> - Win
the 1124 is a very nice amp, but the pinout of the SO-8 package is
weird; I think the die must be big, so is rotated in the package. If
you use it, be careful.
OP-227 is nice, basicly a dual OP-27. Some of the older parts are
handy because they are multi-sourced and cheap.