Question about ADC(step size and the signal )

[jamed]

Hi:

I have a question about ADC:
is there any equation or method to determine the maximum step size that can used to read a signal??

example if i have a signal(sine wave) of 1 Vp.p ,can i use ADC of step size 0.1 V?

 

[keith1200rs]

It depends what you want to do with the digitized data e.g. do an FFT, record it for audio playback, measure the frequency ...

Different purposes will require different resolution.

Keith

 

[jamed]

It depends what you want to do with the digitized data e.g. do an FFT, record it for audio playback, measure the frequency ...

Different purposes will require different resolution.

Keith

i want to read signal and make filtering(low,band and stop filter)

 

[Junus2012]

Hello
the step size defines the resolution, the less step size mean higher resolution

Resolution=V full scale/ 2power -1= step size
the full scale voltage is the maximum input analog signal amplitude
n: number of digital bits and also we call it resolution

so according to your application you can decide the resolution. for general data signal processing the good resolution is 8 bit and more.
if you are really sure that you want 0.1 step size, put this value in the above equation, it will give you a resolution of around 3 bit, now do you think 3 bit resolution is sufficient for your task????? it is now up to you