AD5433: CS pin

Hi,

 

I'm evaluating the board that used AD5433.

 

I executed the test that the noise is applied to the board.

When the noise is applied to the board, the output of AD5433 is reset to zero.

To avoid the problem, I added the capacitor of 470pF(to ground) to the AD5433 CS pin.

 

Is it safe though large capacitor (470pF) is added to the CS pin?

 

Best Regards,
Mr.K

Parents
  • Thank you for your reply.

    It is a board that we designed.

    We do not have the EVAL-AD5445SDZ.

    In this noise test, the following noises are applied to the board.

    Pulse width of noise : 1us
    voltage application : 1700V

    Polarity : positive/negative

    I am using AD5445 in the unipolar mode.

    When the noise test is executed, the output value of the OpAmp is zero regardless of the data to AD5445.

    The noise resistance is improved, if the capacitor of 470pF is added to the CS pin of AD5433.

    As a result, when the noise test is executed, the OpAmp connected with the output pin of AD5445 outputs a correct value.

    Is it safe though large capacitor (470pF) is added to the CS pin?

    Best Regards,
    Mr.K

Reply
  • Thank you for your reply.

    It is a board that we designed.

    We do not have the EVAL-AD5445SDZ.

    In this noise test, the following noises are applied to the board.

    Pulse width of noise : 1us
    voltage application : 1700V

    Polarity : positive/negative

    I am using AD5445 in the unipolar mode.

    When the noise test is executed, the output value of the OpAmp is zero regardless of the data to AD5445.

    The noise resistance is improved, if the capacitor of 470pF is added to the CS pin of AD5433.

    As a result, when the noise test is executed, the OpAmp connected with the output pin of AD5445 outputs a correct value.

    Is it safe though large capacitor (470pF) is added to the CS pin?

    Best Regards,
    Mr.K

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