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

[Mattias Rickardsson]

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