> Maybe you can use a TL5001 (~0.65/1K) or something along those lines..

Quite a good looking solution

        http://focus.ti.com/lit/ds/symlink/tl5001a.pdf

Price is better than most alternatives so far, but approaches that of an
LPC901 microcontroller. I would still need an opamp (2 sections minimum) for
another function, so add an LM324 to the cost. The tl5001 should be more
linear than simple linear solutions.

Such solutions have the disadvantage compared to a microcontroller that they
cannot be altered simply by programming, and the advantage that they don't
need any programming :-)


        RM

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