[sdiy] Op amps (was Re: TI SN74LS624N, worth buying?)

[Dave Kendall]

Hi all.

There is a recent thread over on muffwiggler about opamps, and TL07x vs  
08x. The 7th post down on page one has some interesting comparisons  
posted by daverj from TI datasheets, that suggest the TL07x is superior  
in several ways to TL08x and TL06x, certainly for the standard, rather  
than A or B versions.

thread here;
http://www.muffwiggler.com/forum/viewtopic.php? 
t=45963&sid=52a4d8f16c53520c7fc0e60b4ef7d474

I would welcome opinion on those datasheet figures and how they  
translate to real synth circuits.

cheers,
Dave

On Nov 14, 2011, at 13:06, Mattias Rickardsson wrote:

> On 13 November 2011 21:06, David G Dixon <dixon at mail.ubc.ca> wrote:
>>
>> However, it is interesting to compare the TL07x and TL08x datasheets.  
>>  TL07x
>> is supposed to be less noisy, and yet they share identical noise  
>> specs --
>> 18nV/root(Hz) at 1kHz and room temperature.  Indeed, the only  
>> difference I
>> can see is that the TL08x has slightly better input bias current  
>> specs (30pA
>> typical, as opposed to 60pA typical for the TL07x).  It also looks as  
>> if the
>> lowest-grade TL08x is a little rougher, spec-wise, than the  
>> lowest-grade
>> TL07x, but they seem to be more or less identical in the higher  
>> grades.  If
>> there are other differences, I'm not seeing them.  Perhaps someone  
>> with less
>> datasheet-induced ADHD can point them out!  :)
>
> ADHD or not, I'm one of the many(?) electronerds that keep a simple
> spreadsheet over the most common OP-amps and their most important
> typical values from the datasheets. 8-) It's just too much to keep in
> memory, and too fiddly to look up in different datasheet layouts.
>
> As for the TL074 vs TL084, I've noted the CMRR and PSRR to be better
> for the TL074 (100 dB) than for the 084 (86 dB). I haven't seen
> anything that makes the 074 better than the 084 apart from that.
>
> Hmm. The spreadsheet is on Google Docs... Maybe we should have a
> commonly shared one? But there's so many suffixes/grades/makers and
> different ways to measure things and publish it in datasheets that
> it's comfusing enough for ONE person to keep the document
> trustworthy... :-S
>
> /mr
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