I seem to be getting a large offset from the ADC on the LPC824.
I have the LPCXpresso824 eval board (OM13071) and I shorted the ADC input to GND. I am using the default LPCopen ADC demo code. The output of the ADC is 0x02C, which is about 35mV [(3.3/4096)*44]. I have verified this on several different demo boards - all having an output value when the input is grounded.
I have verified that the calibration is being performed and have verified that the initialization and operation of the LPCopen code follows the users manual.
Am I doing something wrong or missing something that the ADC does not output zero when the input is grounded?