The noise of a ADC~~~~

[ZengLei]

What's the Code-Transition Noise of a ADC?

What's the Noise free code resolution of a ADC and how to get it ?

for eaxmple:

a 16 bit ADC,its peak-peak noise the input terminal is 8LSB,and the Noise free code resolution is 13bit ?So how to get the result of 13 bit?

Why the noise reduce the resolution of a ADC??

Thanks!!!!

 

[rikie_rizza]

An ADC has an effective resolution and maximum resolution. Your ADC quality is surely bad (8 LSB).

If you have a 16-Bit ADC with noise free resolution of 13-bit, that means, you should truncate the LSB by 3-bit. that is how to reduce the ADC resolution. Use bit shifting right wise 3 bit.

 

[~E3016~]

Try to manipulate the signal in the firmware, for example get the value after averaging 10 or more sampling values ...

 

[rikie_rizza]

It's a good idea to try averaging...I always do that for 12 bit ADC. for 14 and 16 bit, averaging must took about 100 sample for the result to be stable. if your ADC is fast enough, say 100KSPS, 100 sample could only took about 100ms to complete.

 

[IBO]

Hi

just calculate effective number of bits from SNR of noisy ADC, to obtain noise free resolution



cheers