ADuCM355 ADC negative input AGND

I'd like to measure a single ended sensor voltage with reference to analog ground,

but none of the available options explicitly say Analog Ground (AGND). I used the

TEMPN option and it seems to be very close to ground. Any comments or suggestions

about this? My current board design does not have any analog inputs available to

connect to ground, so I was hoping that there was an internal connection.