Unfortunately AN1469 does not included exact responses in case of separated analog and digital domain.
What is the theoritical analog domain part of chip and its external components (like transformer)?
Take a look to schematic below, where I show GND and AGND in my viewpoint.
Is this correct separation for GND and AGND domain?
AGND is highlighted for better understanding:
Used references:
DP83848x PHYTER Mini / LS Single Port 10/100 MB/s Ethernet Transceiver datasheet (Rev. E) (ti.com)