ADC question- input voltage range and its sampling frequency

[Nassou]

ADC question

Hi Gents,

I have a question that might appear stupid to you experts.... Is there any relationship between ADC input voltage range and its sampling frequency?
Could you please advice some references? Thanks.

Nass

 

[engr_najam]

ADC question

I think NO.

 

[erikl]

Re: ADC question

... Is there any relationship between ADC input voltage range and its sampling frequency?

Only when the inverse of the sampling frequency gets near to the max. internal (sample, switching, output) time constant of the ADC. And not to forget: for a 10bit ADC, e.g., it takes about 7 time constants (ln 1024) to load a capacitor to about 99,9% of its final value, as not to decrease the inherent (in)accuracy of the 10bit ADC, which is ≈0,1% (1/1024).