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TI Home » TI E2E Community » Support Forums » Amplifiers » Precision Amplifiers » Precision Amplifiers Forum » XTR-111 with 4-20mA sink
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XTR-111 with 4-20mA sink

XTR-111 with 4-20mA sink

This question is answered
shravan yadav102354
Posted by shravan yadav102354
on May 15 2012 23:34 PM
Prodigy20 points

Hello there,

I am using XTR-111 in one of our products, in order to get 4-20mA current output.  It is working well.

Our product has provision for sourcing 4-20mA, and not sink.  I want to know weather it is posible to provide 4-20mA sink capability with XTR-111.

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  • Avi Chami1
    Posted by Avi Chami1
    on May 16 2012 00:27 AM
    Mastermind7405 points

    If one of your products outputs 4-20mA, you may use the RCV420, a current loop receiver, which converts the current to a 0-5V voltage

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  • shravan yadav102354
    Posted by shravan yadav102354
    on May 16 2012 01:35 AM
    Prodigy20 points

    thanks albert for your reply.

    But I want to use XTR-111 such that it can sink 4-20 mA current instead of sourcing.

    is it possible with XTR-111

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  • Avi Chami1
    Posted by Avi Chami1
    on May 16 2012 02:03 AM
    Mastermind7405 points

    Take a look at this thread, I think that for current sinking other products may be used:

    http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/t/170869.aspx

     

     

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  • Collin Wells
    Posted by Collin Wells
    on May 16 2012 09:34 AM
    Verified Answer
    Verified by Collin Wells
    Genius15510 points

    Hello,

    Albert,

    Thanks for the help!

    Shravan,

    Before I go too much further I want to be sure you're not looking for a remote 2-wire transmitter to complement your XTR111 which is a 3-wire transmitter.  If so, please look at the XTR115, XTR116, or XTR117.  These are meant to be operated as remote 2-wire transmitters and operate as current sinks.  If you are not designing a remote 2-wire loop powered product then do not use these parts, they do not work like the XTR111 and are meant for specific applications and you would know if you were designing one.   

    Then to get back to your original question, the XTR111 can not be used as a current sink.  It is mean to source current.  If I thought about it for awhile I'm sure there is a way to add a bunch of extra circuitry to make the XTR111 control a current sink but it would be much simpler just to build a discrete one out of a single transistor and op-amp.  Please take a look at the following posts because there is a lot of information about current sources/ sinks. 

    http://e2e.ti.com/support/amplifiers/etc_amplifiers__other_linear/f/18/t/156111.aspx

    https://e2e.ti.com/support/amplifiers/precision_amplifiers/int-precision_amplifiers/f/16/p/140361/506524.aspx?Redirected=true#506524

    https://e2e.ti.com/support/amplifiers/precision_amplifiers/int-precision_amplifiers/f/16/p/171576/626995.aspx?Redirected=true#626995

    Also, here is a wonderful application note from Burr-Brown on current sinks / sources.

    http://www.ti.com/litv/pdf/sboa046

    Regards,
    Collin Wells
    Precision Linear Applications

    Regards,
    Collin Wells
    Precision Linear Applications

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