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4-20 ma V to I converter and Opamp parameters

Question asked by ChaitanyaB on Apr 17, 2013
Latest reply on May 22, 2013 by tjohnson

Hi,

 

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?

 

Thanks,

 

Chaitanya

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