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Vrefn in ADC equation

Question asked by Daniel Vaquerizo on Mar 24, 2017
Latest reply on Mar 31, 2017 by Daniel Vaquerizo

Hi;

 

I am working about a LPC824.

In UM10800.pdf at page 322 "Perform a single ADC conversion using a software trigger"  it says that The result of the conversion is (4095 x VIN)/(VREFP - VREFN). But I need to know why is that equation and not this other:

 

 

The last one indicates a FS between Vrefp and Vrefn.

 

In this terms, the minimum LSB is:

 

 

Can someone help me?

 

Regards. Daniel.

 

 

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