I am planning to use CN0325 for universal analog input type board. I have query about +/- 20mA analog current measurement circuit path. I did not found any shunt resistor in circuit for the current measurement. What is measurement path of circuit for +/-20mA input.
Thanks and Regards,
I was reading the circuit note for this, and there is a section of the document that talks about how to connect up the current input. Here is what the text says in the document:
"The P10 connector is used for voltage and current input connections. This allows differential inputs in the ranges of 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, 0 mA to20 mA, 4 mA to 20 mA, and ±20 mA. Connect voltage or current inputs between V1+ and V1− (see Figure 13). For current inputs, also short V1+ and I1 pins together, thereby connecting a 249 Ω precision current sensing resistor with 0.1% accuracy and 0.25 W rating."
Here is a link to the document for your reference, I hope you find this helpful.(https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0325.pdf )
Thank you for the explanation! I clearly understood all possible input circuit path.