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ADC12 of msp430f235

akhilesh sati
Intellectual 950 points

I am working with msp430 f235.  the input signal that is given to ADC12 of msp430 is 150mV sin signal.The negative input voltage range that msp430 can sustain is -0.3V. Would such a input signal can affect the performance of ADC12 ? because the negative reference given to ADC12 of msp430 is 0V.

  • 0
    Guru 27285 points

     Hi, I hope a basic electronic course can solve all your problem.. A simple voltage translator with a simple operational can solve your trouble.

     Use a buffer from Veref out then refer zero voltage of your signal to mid of veref with a voltage divider, feed half voltage to one adc channel to sample it and voltage translator (single ended) to another channel then calculate the difference from input signal and half ref  to have your sine fully sampled on positive and negative halves.

     If your signal peaks exceed half of reference then reduce translator gain, if you wish full scale reading increase stage gain.

  • 0 in reply to Roberto Romano
    Intellectual 950 points

    If I directly input this signal into ADC12 of msp430...... can such voltage signal damage to the msp430 ?

  • 0 in reply to akhilesh sati
    Guru 27285 points

    Hi, 150mV peak I hope are accepted by input, but you cannot read negative halves of signal.. What are you attempting to read? Don't continue post again and again same question, please e more specific.. what you need to read of signal?

     The circit I posted generate half reference voltage and input signal superimposed to half ref so you can read both and by difference have all value from negative to positive peak.

     Regards

     Roberto

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