Well, Mark,
You gave me a good idea. I decided to multiplex the instrumentation
amplifiers and connect their outputs in parallel.
There are several solutions like this using TI instrumentation amplifiers
with shut down. I have only to test how will affect the offset and general
behavior of the amplifier.

thx,
Vasili :)

On Fri, Oct 16, 2015 at 12:49 AM, Mark Rages <markrages@gmail.com> wrote:

> You favourite USB micro and a couple HC4067?
>
> Regards,
> Mark
> mrages@sram
>
> On Thu, Oct 15, 2015 at 10:06 AM, embedded systems <piclist9@gmail.com>
> wrote:
> > Hi all,
> > I need a microcontroller with a lot of A2D and USB interface. I want to
> > read 25 RTDs with a refresh rate of about one/100mS. Maybe PIC18LF45K50=
?
> > Any better choice? Maybe Atmel?
> >
> > How would you approach this?
> >
> > thx,
> > Vasile
> > --
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>
>
> --
> Regards,
> Mark
> markrages@gmail
> --
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