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XTR111: Review of schematics

Sebastian P J
Expert 1775 points
Part Number: XTR111

Hello Sir,

I am designing new industrial project, it consist of 8 current loop lines. For this i use xtr111. please find the attached schematics file.

We need both current loop and amplified outputs, but at a time one type will use. Can you check is there any error in my designSCHEMATIC1 _ 04_ ANALOG OUPUT M.pdf

  • 0
    TI__Mastermind 23050 points
    Hi Sebastian,

    Looking over your schematic the XTR111 appears to be configured properly. One thing I'm unclear on is why you have chosen to use a bidirectional TVS on your output. Do you really want to clamp the output to a relatively large negative voltage as opposed to the forward voltage of a unidirectional TVS?

    Regarding U19 and U27, is there a reason you have decided to use a dual op amp for your application? It looks like the second internal amp is just buffering the output of the first, but I don't see an advantage in doing this in your schematic.

    Lastly, I would highly recommend placing some external protection circuitry on U19 and U27 , especially in an industrial application. If you are not familiar with selecting protection components for op amps, I would recommend looking through the TI Precision Labs series on Electrical Over-Stress found here: training.ti.com/ti-precision-labs-op-amps

    Regards,
    Zak Kaye
    Precision Amplifiers Applications
  • 0 in reply to Zak Kaye
    Expert 1775 points
    Hello Zak Kaye,
    Thank you for your reply,
    In the xtr111's evaluation board reference schematics, there is a bidirectional TVS diode. I thought this is for any surge protection application, so that i added this TVS diode. We don't need any clamping at the output.
    We also need a voltage amplified output, so that i added this amplifier section. I saw in most of the op amp application circuit, there is a voltage follower followed by an amplifier may be impedance matching.
    Regards
    Sebastian