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Insulating a 4...20mA Loop Simulator

Vasileios Ioannou
Prodigy 40 points
Other Parts Discussed in Thread: XTR105

Dear Sirs,

i have built a 4...20mA Loop Simulator circuit using XTR105 which i use for marine automation purposes and i can surely say that it works smoothly.

However on my last attendance on a vessel i carried with me a VHF and will using it i noticed that the VHF signal caused severe noise which distorted my current.

Can anyone suggest a solution to overcome this issue?

Your prompt reply will be duly appreciated.

Ioannou V.

  • 0
    TI__Guru 64125 points

    Hello,

    The current loops themselves are usually not very susceptible to EMI/RFI interference.  However, the inputs of the XTR105 are standard amplifiers which do have concerns with EMI/RFI pick-up.  PCB routing and layout will have a great deal to do with the susceptibility and you should keep the input network small and compact.  I would also recommend a passive low-pass filter on the inputs as shown in the datasheet in Figure 5.  Please also read through the "Radio Frequency Interference" section of the datasheet which provides similar advice to what I've suggested.

    Hope this helps!

  • 0 in reply to Collin Wells
    Prodigy 40 points

    Dear Mr. Wells,

    as you suggested and having in mind figure 5 i will use bypass capacitors and hopefully rectify the issue.

    I suppose 0.01μF capacitors will be enough. Any additional suggestions will be appreciated.

    Thank you for your help.

    Ioannou V.