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ADuCM330WFS Internal equivalent circuit of current channel

My needs

1.I Want to know the internal circuit of ADC module current channel inside the chip.

2.According to the schematic diagram given, please help to draw the equivalent circuit diagram of current acquisition.

I use pin IN+ and IN- to measure current.The configuration of ADC0CON is  shown in the picture below.

And I use internal reference(1.2V).

The  Current ADC (ADC0) Functional Overview I have already read, but I couldn't understand.So, please help to draw the equivalent circuit diagram of current acquisition.