Rolf,

thanks for your replay. Using Vref is very good idea but in my case the 
situation is lot more
complicated. This is how it should be:

0-2,4v  output 0-1023 with 2's complement format and enable a bit
2.6-5.0v  output 0-1023 disable the bit. While it is in between 2,5v 
should output 0

any idea?

thanks for your help

Andre

>Andre Abelian wrote:
>  
>
>>Hi to all,
>>
>>I need to convert ADC 0-2,5v  result to  0-1023 output to uart.
>>I am kind of lost how to do this should I add result x 2?
>>any help will appreciate.
>>
>>thanks
>>
>>Andre
>>  
>>    
>>
>You need to get 2.5V on the Vref+ pin, and use that for the 10bit 
>conversion. The challenge is then to get a 2.5V reference.... ;-)
>
>On PIC18 devices see the ADCON1 register bits VCFG0 and VCFG1
>
>on PIC16's see the ADCON1 register's PCFG bits.
>
>Rolf
>  
>

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