Shahar Ben-David

JM32 ADC - First Sample Error

Discussion created by Shahar Ben-David on Mar 19, 2009
Latest reply on Mar 19, 2009 by David Payne



I am working with the JM32 MCU and using the ADC in 12bit mode.

I see that when I change the ADC channel from one source to another the first sample seems a bit off (around 2-3 LSB's) other samples are very accurate (less than 1/2 LSB). I'm checking this with a very accurate calibrator unit.


Is this a known issue?

Does the ADC hardware short the holding capacitor before a new sample is taken?


Help is highly appriciated.