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XTR117: Opamp input from shunt resistor.

Bekir Aslan
Prodigy 120 points
Part Number: XTR117

Hi,

For XTR117, I will use 250R shunt resistor.
I will read 1-5 V. on the resistor.
There are two methods for this.
What should I use?
method 1: voltage follower
 
method 2: instrumentation amplifier
 
What can you suggest?
Regards,
  • 0
    TI__Guru 63351 points

    Hi Bekir,

    XTR117 is 2-Wire Transmitter,  which the I_RET pin has to allow float with respect to the loop supply ground, see the attached image below. It is likely that you have to use instrumentation amplifier, depending on your application. Enclosed is 2-wire and 3-wire application notes about 4-20mA transmitters. 

    6371.4-20mA_Basics.pdf

     Best,

    Raymond