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  • TI Thinks Resolved

AMC1100: Offset output voltage at 0V input issue

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Replies: 8

Views: 257

Part Number: AMC1100

Hi all,

While trying to use the AMC1100DWV as a current sensor I saw that in several units the output voltage while v_in = 0V exceeds +/-25 mV depending on the sample.  ¿Is it OK? I am attaching the acquisition part of the schematic to take a look.

It looks like it is too much. but I would like to confirm that there is no bug in the schematic.

Best regards,

Martín

  • Hi Elmarto,

    what is BH1?

    Kai
  • In reply to kai klaas69:

    BH is an internal designator to name a net tie for ground. It allows to tie to nets at a specific point in the layout. For the sake of this analysis it is just GND

  • Hi Elmarto,

    When you have 0V in, are you actually sorting the inputs of the AMC1100, or just not applying any signal?

     

    Regards,

    Tom

  • In reply to Tom Hendrick:

    Tom,

    It is not an actual short between the inputs. But VIN_P is connected to VIN_M thru ~12_Ohms.

    Thanks in advance,

    Martín

  • In reply to elmarto:

    To add up to my response: The measured input voltage in this situation (no input voltage) is 0V.
  • In reply to elmarto:

    Great! Try taking a couple more measurements - short pins 2 and 3 together, short between TP8 and TP9 and see if there is any difference. Also, are you measuring the output deferentially or VOUTp to GND2 and VOUTn to GND2?

     

    Regards,

    Tom

  • In reply to Tom Hendrick:

    Hi Martin,

    How are you making out here?

     

    Regards,

    Tom

  • In reply to Tom Hendrick:

    Hi Martin,

    Closing this post for now. If you have any additional feedback, please feel free to post it here.

     

    Regards,

    Tom

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