On Tue, Dec 03, 2002 at 09:48:44PM -0800, Jaap van Ganswijk wrote:
> At 2002-12-03 11:29 -0800, Shazze wrote:
> >any body here know about such integrated circuit in which more then 8 or
> >16 opamp exist, like TL084 in which quad opamp present.
>
> Since the opamps are not interconnected there is
> no need to put a lot of them on a big chip. It's
> for several reasons much better to put only upto
> 4 in one package:
> - production wise: they can make a small chip and
> use a cheap standard 14 or 16 pin housing
> - board space wise: three 14 pin chips take about
> as much space as one (traditionally shaped)
> 24 pin chip, yet you have 14*3=42 instead of
> 24 pins of functionality (minus some pins that
> are needed on each chip like 0V and 5V and
> perhaps clock and enable inputs.
> - stock space wise: manufacturers, distributors
> and users only have to stock one type of chip
> - design functionality: you waste less unused
> opamps
I would recommend the opposite way: single SOT23-5
OP-Amps; put the opamp in your signal path, where
you need it, the layout would be much easier. You
save board space (because of less and shorter wires),
hit the EMC requirements better, have less crosstalk
... and more. However placing costs may be higher.
TTL-Logic is also available that way (I like it).
Matthias
--
Author: Matthias Weingart
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