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Original question:

XTR117: XTR117 output nosie level

XTR116: Noise calculation

Kuramochi Tadahiko
Guru 28715 points
Part Number: XTR116

Hi,

Noise is specified 0.6uVpp on the datasheet.

How much does this contribute to output current noise?

I would like to know the equation to calculate it.

Best Regards,

Kuramochi

  • 0
    TI__Genius 10850 points

    Hello Kuramochi-san,

    Thank you for your post.

    The input referred voltage noise as specified in the datasheet is 0.6µVpp from 0.1Hz to 10Hz. This can be converted to output current noise using the equation shown on the first page of the datasheet:

    Io = (100*Vin) / Rin, where Vin is your input referred voltage noise of 0.6µVpp from 0.1Hz to 10Hz

    If you take this Io and multiply it by your load resistance (RL), that will be your output voltage noise. 

    -Tamara Alani

  • 0 in reply to Tamara M Alani
    Guru 28715 points
    Tamara-san,

    Thank you for your support.

    Is this noise specification(0.6µVpp from 0.1Hz to 10Hz) assumed flicker noise?
    If yes, why isn't broadband noise mentioned?

    Best Regards,
    Kuramochi
  • 0 in reply to Kuramochi Tadahiko
    TI__Genius 10850 points
    Hi Kuramochi-san,

    I'm happy to help.

    The datasheet doesn't show the noise across frequency, but I will look into this to see if we have the data stored anywhere. This is an older device, so it may not be available. The device was designed and released mainly for pressure and temperature sensing which tends to be a slow moving signal. This is probably why we didn't release the broadband noise.

    What are you measuring?

    -Tamara