will it posible be posible to just amplify 2.5volt refrence to 3volts using 
an opamp.. If I do it this way will it not be unstable and susceptible to 
logic load noise.. anybody did somthing like this..

thanks..

"Vasile Surducan" <piclist9@gmail.com> wrote in message 
news:5eeda4c20610032225k7d0f1b0bta4c7c1b24c2e7871@mail.gmail.com...
> 16F series need somewhere between 2.5V to 2.8V.
> I doubt 18F philosophy on AD is different.
> The best choice could be a 3V linear regulator which gives you both
> the supply and the reference. Like LT1763-3 ?
>
> Vasile
>
> On 10/3/06, genome <jtroxas@gmail.com> wrote:
>> hello,
>> Anybody can recommend 3 volt Vref Diode.. I cant use a 2.5volt such as
>> LM336BZ-2.5 as the datasheet for pic18f242 says:
>> (VREFH - VREFL) must be minimum of 3V when Vdd >= 3V..
>> is this correct as I've heard on other PICS its 2.5volts.. maybe I could 
>> use
>> a zener but unfortunately I could not find any zeners here that has 1%
>> tolerance..
>>
>> thanks..
>>
>>
>>
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