I want to get accuracy of 0.1% in the following analog signal measurement: AC voltage in the range of 0-300V (0.1% = 300 mV)
Then what is the minimum no of bits or resolution of ADC that I can use?
My understanding is following:
If I use 16 bit ADC then I get:
300/65536 => 0.0045 => 0.4%
So I need an ADC with better than 16-bit resolution.
Is my understanding correct in this calculation?
Edit: adding more details:
I want to do all calculations based on ideal cases only at this time. I am not worried about the frequency of signal, sampling rate or power supply issues of the design at the moment.
If I also need to use the same ADC for following signal measurements with 0.1% accuracy: Current (DC and AC) in the range of 0-50 A. (0.1% = 50m A) Resistance in the range 0f 0-10 MOhm. (0.1% = 10k Ohms)
Then what additional conversion factors I had to include in my calculations?
For example how will it effect my calculation when I convert a current signal or resistance related signal into voltage to feed into my ADC?
Can a 16-bit ADC fulfill the 0.1% accuracy design requirement in all of the above V, A, R measurements?