Hi ,

Thank you very much for the info. I didn't know such a chip exists. However my problem is somewhere else. The chip would definately not be available in Kolkata where I live. Even if I get it from somewhere else in my country it will be terribily costly (I suppose). Since this is not a commercial project I am not in a mood of spending much on it. Only fascinated by the idea of using a PIC and PBP in my design. So I will stick to legacy components. I would be using a inverting OP-AMP so that a -2.5V t0 +2.5V gives me a swing of 0 to 5 volts. I know I would be reducing the resolution but okay for this crude design. The other part is that I would not be using rail-to-rail OP-AMPs so for a full scale range of 0 to 30volts I would be generating a reference voltage using the PWM and scale it up. The statedgy is Keep It Simple. Your links were very helpful and I hope you can comeup with something very cheap using general components.