Usually V to I 4-20 ma converter is designed using OPAMP and Trasnistor and resistors. How OPAMP parameters play a role in accuracy is rarely mentioned. Many times the resistance only considered in transfer function. I think transistor and OPAMP parameters will also play a significant role in accuracy. Pls can anyone explain this?
ADI is having many 4-20 drivers like AD421. It has many highlighted parameters. How to calculate overall error introduced by a driver?
What is the accuracy threshold to go for a DAC based(AD421) or Discrete OPAMP based solution?