How much is the SAR ADC result higher than Vref or lower than GND?

Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

cross mob
User17740
Level 4
Level 4
First solution authored First like received
Hi all,

Is input voltage lower than 0V is converted to the same as 0V by SAR Analog-Digital Converter (ADC)? And how about higher than Vref?

Thanks!
Bernie


#8042000 13092
0 Likes
1 Reply
User17612
Level 4
Level 4
First like received
Hi again,

If input voltage is lower than VAGND, then for VADC the result is 0V. According to SAR ADC architecture, it is impossible to produce negative result.
In case of higher voltage, max digital output is 0xFFF. we will only show result between 0 and FFF.

Regards
Lucas
0 Likes