> Is there an IC around that takes a square wave as input
 > and outputs a sine wave?

I think a capacitor will do.

pic pin that
o----------------o----------------o your sine wave
generates        |
square wave      = capacitor
                  |
                  X ground

Obviouslly the capacitor will generate a sine wave between GND and Vdd.

I think this will help.
-marco-

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Fontani Marco aka RoZe}[R]{@IRCNet & Shanks@IrcOp@IrcItalia
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x = x^y; y = x^y; x = x^y; <-= swap with no need for 3rd var.

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