> A further problem is that the E-POTs/DACs i found so far usually provide 8
> bit resolution. This means i had to use two of them by adding/combining
its
> outputs via a high precision op-amp.

You have to be careful here.  Most D/As are no better then +- 1/2 LSB.  You
therefore can't just add the scaled outputs of two such 8 bit D/As to make a
useful 12 bit D/A.  The combined D/A will still be +- 1/2 LSB of the top 8
bits, which means the extra low bits are meaningless.

> But the MAIN QUESTION however is:
>
> Is my way a good one at all, or does anybody know something completely
> different that is probably BETTER / EASIER / CHEAPER or even more
RELIABLE.

What's wrong with the obvious solution of using a 12 bit D/A?  Keep in that
you have to pay reasonable attention to offset voltages, drifts, and other
sources of error at this resolution.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@embedinc.com, http://www.embedinc.com

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