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About the resistance value and the capacitor Value of AD7946

Question asked by Yuya on May 25, 2017
Latest reply on May 30, 2017 by Yuya

Hi,

I would like to use AD7946.

But, the output of Voltage follower(AD8629) before the ADC oscillated.

So, I have three questions.

 

#1  Is a capacitor(2.7nF) necessary? Is it possible to reduce the value or not to use a capacitor?(In Figure.25)

 

#2  How high can the resistance value(33Ω) be increased?(In Figure.25, Figure.28)

    

#3  When the resistance is set to more 250 Ω, what is the THD value?(In Figure.28)

 

 

 

Best Regards,

Yuya

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