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[Moved]: Analog to digital converter

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Majid_Vatan_Parast

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Hello everybody

In an ADC, how Vref, input voltage range and voltage supply are related together ?
 

Re: Analog to digital converter

Hi,

I recommend to read through general ADC informations, or any good ADC datasheet...best if you read ADC application notes, too.
It will give a lot of good information.

Usually the allowed input voltage is limited by supply voltage ... but this is not always the case
Usually the "decodable" input voltage is determined by the reference voltage ... but even here are different schemes

So the correct answer to your question is: it depends on the used ADC.

Klaus
 

Re: Analog to digital converter

The output from an ADC is very dependent on the stability of Vref and power supply.

At 5V with a 16 bit A/D a one bit change is equivalent to about 75 micro volt change on the input - so a stable, noise free Vref and power supply is essential to maintain the ADC accuracy.
 

Take a look here:
- **broken link removed**
- **broken link removed**

and also into literature: **broken link removed** .
 

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