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TMS570LC4357: TMS570LC4357_ADC_Vref

Part Number: TMS570LC4357

Tool/software:

I have initialized the ADC module in the TI Hercules TMS570LC43xx with a 12-bit resolution. 
When I provide an external input to the microcontroller to test the ADC, I am getting a count of 4095 at 3.1V (external input to the controller). 
What could be the problem? 
I have the jumper ON at J8 on the development board, which enables 3.3V to the ADC.