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i.MX25 ADC integrated reference voltage

Question asked by Geisreiter Andreas on Jul 22, 2013
Latest reply on Dec 17, 2013 by Yuri Muhin

Hello,

 

with i.MX25 ADC it is possible to use the internal 2,5V reference voltage. I can't find any Information about the precision of this voltage in the datasheet. Does someone has information about that?

Background: We supply the VDD_tsc with 3,3V and the Vref of ADC also with 3,3V. But the precision of 3,3V Vref is not very high. So we like to use internal reference to get better performance with AUX ADC inputs. For the touch Screen the 3,3V supply is good enough

 

Does it cause any Problems, if  VDD_tsc is supplied with 3,3V and we use 2,5V internal reference for AUX ADC? Does I need to switch between internal and external reference for touch and AUX Inputs in our case?

 

Best regards,

Andreas


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