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AD7195 Power supply rejection ratio

Question asked by cydrollinger on Feb 24, 2016
Latest reply on Feb 29, 2016 by rcalam

I am trying to understand the minimum necessary input voltage supply noise due to the AD7195 having a typical 95dB PSRR. If the supply voltage to the ADD7195 is 5 volts then the minimum resolution would be approximately 300nV, or 1 bit resolution would be 300nV. The adc has 95dB of power supply rejection ratio, over some frequency range?

If the selected 5V linear regulator has a 25uVrms specification over 100kHz how does this compare to the required input supply of the AD7195 for a 300nV resoltion?

 

Thank you for your consideration of my problem!

 

Cy Drollinger 

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