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LAUNCHXL-CC1310: CC1310 maximum ADC value when connected to 3.3V VDD

Stevan Preradovic
Intellectual 905 points
Part Number: LAUNCHXL-CC1310

Hi,

Ive been going through Simple Link Academy and have been doing the TI Driver Project Zero for CC13x0 devices. The example shows how to sample an analog signal on ADC0 and post the converted digital signal via the UART to a terminal. That all worked fine. I figured out that input to ADC0 on the board is connected to DIO23 pin on the launchpad.

When I connect DIO23 to a GND pin then i get a value of 4 or 3 in the terminal after the ADC conversion which is expected (pretty close to 0).

But when I connect DIO23 to the 3V3 pin I get a maximum of 3122 (varies a bit between 3122 and 3115). I would expect something closer to 4095 for a 12bit ADC, right? Am I missing something.

Thanks

Stevan