How can I code a 12-bit-output of an ADC

[DuftDerBlumen]

Hi,

I am using an ADC (AD7266) in order to convert an Input Voltage to a 12-bit-value.

I would really like to ask you if there is a standard method for the coding of these bits? For example when I put an input voltage of 1V I get different values like 11010011110 or 11010101000 or11010011001. As I am not familiar with ADCs, I would also like to ask you if this instability is normal and if there are some solutions to reduce it.


Thank you very much in advance for your help.
best regards,
Chadha

 

[klystron]

The output coding depends on the input selection: diff. input will output in twos complement and single inputs will output in straight binary

 

[keith1200rs]

That sounds like noise on your input signal. Even is you simply supply the ADC from a potentiometer it could have noise on it. Also, some ADCs need a low impedance source. A capacitor on the input to ground may help...' read the recommendations with the micro/ADC.

Keith

 

[Manu.electronics]

Hi... After seeing replies for your post i got confused that whether you are asking how to get digital code from your ADC or how to program the 12 bit output from ADC.......

 

[keith1200rs]

I assumed the problem was the instability in the values!

Keith.