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TI Home » TI E2E Community » Support Forums » Amplifiers » Precision Amplifiers » Precision Amplifiers Forum » TINA software + INA321 Testing error
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TINA software + INA321 Testing error

This question is answered
LaunchRed
Posted by LaunchRed
on Aug 09 2012 21:14 PM
Prodigy240 points

Hi, I am testing TINA with INA321:

The vout should be 5 X 1mv (GAIN X Difference input) = 5mV, but voud = 19,6mV.

What is wrong?

INA321 Datasheet: http://www.ti.com/lit/gpn/ina321

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  • Pete Semig
    Posted by Pete Semig
    on Aug 10 2012 08:21 AM
    Verified Answer
    Verified by LaunchRed
    Genius13115 points

    Hello LaunchRed,

    The device is trying to output 5mV.  With a single supply the output can only swing to within 25mV (typical) of ground according to the datasheet.  Try biasing the REF pin with at least 50mV and your output will be 50mV+(gain*Vdiff).

     

    Regards,

    Pete Semig

    Precision Analog Applications

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  • LaunchRed
    Posted by LaunchRed
    on Aug 10 2012 17:50 PM
    Prodigy240 points

    I found what you said here (page  3):

    What is "Output Voltage Swing from Rail"? I am a beginner

    Thanks for the help!

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  • LaunchRed
    Posted by LaunchRed
    on Aug 10 2012 20:11 PM
    Prodigy240 points

    I understand, the output swing is the range of output with respect to the power suply.

    The output can be between 0+50 mV and VCC-50mV (single suply)

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