Hi,
Thank you so much for your interest in our products and for using our community.
There is no demo for ADC in differential mode, just those that you can find in the SDK. Sorry for the inconvenience.
The only reference is the reference manual and also, such ADC mode is supported in Config Tools.
Just take into account that the conversion in differential mode is only limited to the pairs that are available as differential channels.
Hope it helps you.
Have a nice day!