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RM57L843: ADC

Part Number: RM57L843

Hi team,

   In our project we use RM57L843 Microcontroller I have some doubts on ADC. 

    When the ADC Channels are not connected to any inputs that means if the ADC channels are left free why different voltage is read by the controller?

Here I am giving 0v to 0th channel only other channels are left free but some voltage are present. why?

vrefh = 3.3v, vrefl = 0v.

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1262774/rm57l843-arm-based-microcontrollers-forum/4782589?tisearch=e2e-sitesearch&keymatch=%20user%3A554481#4782589

In this thread we discussed that 6th channel only not working in ADC. Now we replaced the controller, after that the 6th channel is worked and we soldered the 6th channel not working controller to our launchpad, In launchpad also that 6th channel is not working. can you please tell why that particular channel is not working.

Thanks 

regards 

Veerappan P.A