Dear All, I have a 4-20mA pressure sensor and use a microcontroller to measure the pressure. My region of Interest is 9-11mA and an AD620 maps it to
0-5V. However, occasionally the pressure swings and the output of the AD620 becomes negative or above 5V due to the high gain of the amplifier. I wonder if negative or >5V will hurt the A/D port of the microcontroller. Do I need a clamping circuit that holds the output between 0-5V.Thanks
the spec tells you what input is safe, but with most PIC you cant go outsdie the supply voltages by more than a fraction of a diode drop.
cant the ad620 work of 0-5v or use some other chip that does? this will assure limited range.
a resistor and schotky diode clamp to the rails would be suitable clamp otherwise.
Colin =^.^=
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