adc resolution calcualtion question

[saeyd akbar]

adc resolution

hi every one
i am asking for your help brother in this qusyion
if the out put from a sensor is a voltage in the range 1-5v, what is the minimun number of A-D bits required to guarantee a resolution of 0.001v?

 

[dmk]

adc resolution

If the range is 1-5, it means you should measure 4V amplitude. So, 4V/0.001V=4000 steps or your ADC resolution should be at least 12 bits, because 2^12=4096.

 

[saeyd akbar]

adc resolution

thank you for your reply but the range is 1 to 5v not 1-5v.

 

[dmk]

adc resolution

Yes, I meant the same. With range from 1V to 5V, the amplitude is 4V, and the calculations are as the previous.

Added after 2 minutes:

So, to have 1mV resolution (0.001V) you'll need of 12-bit Analog to Digital converter, at least.

 

[saeyd akbar]

thank you very much brother