Has anyone else noticed a large discontinuity while using the LPC845 ADC near mid-value? I am seeing a range of missing codes immediately below 2048 ticks.
I can replicate this on my own boards along with the LPCXpresso845MAX dev board using minimally modified example code. By changing the adc_basic example to use ADC2 and connecting a bench supply with 2K/22K resistor divider to Analog header A0, I can replicate the issue by dialing the supply voltage. Here are the missing code ranges I observe on my three LPCXpresso845MAX boards:
The problem exists independent of sample rate and is present at much lower input impedances as well. This is rather annoying for my application since I have bidirectional current sensors which idle at half ADC value.