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XTR115U - Filter Design

Atul Bhakay
Genius 3205 points
Other Parts Discussed in Thread: XTR115, XTR117

Hi, Kindly advise how to design the FILTER for the current output from XTR115U

Regards

Atul Bhakay

xtr115 4-20mA Out 01-10-2016 (For Filter Design).pdf

  • 0
    TI__Guru 62085 points

    Hello Atul,

    From the .PDF file it looks like your question is "What's the best way to filter a PWM signal so it can be used as an input to the XTR115 device?"

    We recommend a multi-order passive filter followed by a low supply current op amp used to buffer the filtered PWM signal to the inputs of the transmitter.  A simplified example of this is shown below based on the XTR117. 

    You can reduce the number of passive RC stages based on your ripple requirements.