Need help. I am using RCV420 to convert 4-20mA to 0-5v. For testing I have got a calibrator which +mA and -mA lines and gives me precise 0-20mA output. I have few questions regarding RCV420 circuit
1. As the calibrator is self powered, how do I connect the output of calibrator i.e., +mA and -mA to RCV420 input?
2. Can this IC be used with single power supply, say +15v only. In this case what all changes needs to be incorporated in the circuit (in comparison to the circuit mentioned on the datasheet of page 5 (fig 1))?
Waiting for the inputs.
Thank you for your interest in the RCV420.
Wire the circuit as follows:
2. Can this IC be used with single power supply, say +15v only. In
this case what all changes needs to be incorporated in the circuit (in
comparison to the circuit mentioned on the datasheet of page 5 (fig 1)?
The RCV420 is not a rail-to-rail output amplifier, so it requires a negative supply rail of at least -1.5V in order for the output voltage to reach 0V. It is perfectly fine to provide an asymmetric supply voltage, for example, +15V and -1.5V.
Ian WilliamsLinear Applications EngineerHigh Performance Linear
Thanks Ian for the solution. The system worked and I am getting the correct readings.
I had one more question
1. Is there any way to use both +mA and -mA, so that the input is isolated?
Waiting for your input.
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