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MSPM0C1105: Will using high Precision Vdd improve internal reference performance?

Joseph Scherphorn
Expert 8310 points

Part Number: MSPM0C1105

Hello, 

In system being designed a high accuracy 3.3V as well as a lower voltage high accuracy reference are needed. 

My question is will the accuracy of the internal voltage reference improve if a precision source is used for vdd?  If so Is this quantifiable?

 

Thank you, 

Joseph Scherphorn

Will using high Precision Vdd improve internal reference performance?

  • 0
    Guru 43915 points

    I don't think so, it is set by the internal reference. You can provide an exetrnal reference if you want.

    A high precision Vdd will prevent whatever power-supply variation might be present, it it is usually second or third order effects.

  • 0 in reply to Keith Barkley
    Guru 43915 points

    Here are the Ref specs:

    Note that the supply rejection is over 40 dB, so a precision VDD is not going to help much.

  • 0
    TI__Genius 9061 points

    Hi Joseph,

    As Keith has pointed out, a precision voltage source will not have a significant effect on the accuracy of the internal VREF.

    If your system requires a higher accuracy VREF, I would suggest using an external reference.

    What kind of accuracy are you targeting? What is the application?

    Best,

    Owen

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