As an assignment I have to design an industrial data acquisition system based on a microcontroller, using it's integrated ADC. Thus signal input range is limited to 3.3V. I am looking for a solution or reference design, to measure the common industrial transmitter outputs with my ADC. 4-20mA signals are easy to deal with. My main concern is voltage measurement of signals higher than 3.3V. I have been adviced to use a programmable gain amplifier which is capable of attenuation. Although I have doubts using it, one reason being is that I hardly find any out there. Any suggestion or reference design for such a system?
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