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AD7634 Pin capacitance

Question asked by gabrielbrunheira on Dec 18, 2012
Latest reply on Dec 20, 2012 by KarenNE

Hi everyone,

 

On page 20 from AD7634 datasheet it's stated that "during the acquisition phase for ac signals, the impedance of the analog inputs IN+ and IN-, can be modeled as a parallel combination of Capacitor Cpin and the network formed by the series connection of Rin and Cin. Cpin is primarily the pin capacitance". This is showed in Figure 28, but there is no information about the value of Cpin through the entire datasheet

 

Is this value just missing, or it should be measured by me? In any case, could someone give me some kind of expected value for it? I'm currently designing the front-end for this ADC, and I need this information to simulate some circuits.

 

Thanks in advance,

 

Gabriel

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