How to set the step voltage in ADC?

deng · ‎2004-05-30

Posted on May 30, 2004 at 16:17

deng · ‎2011-05-17

Posted on May 17, 2011 at 12:01

Hi All,

I am using the uPSD3254BV and AVREF is connected to VCC with a 4.7K current limited resister. All the ADC (ADC2 and ADC3) input signals are less than 3.3V (AVREF). However, when we set the ADC input to 2.3V the ADC output already reached 255 which filled the 8 bit ADC register. Any higher ADC input voltage would set it to 255 as well.

Is there any way to set the sample step voltage to have matach the AVREF. It seems the cutoff point is at 2.3V instead of 3.3V.

Any ideas?

SD