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ADS131A04: ads131a04 GND connection confusion

Part Number: ADS131A04
Other Parts Discussed in Thread: TIDA-00810

Hi, we are designing a 4 channel sonar data sampling system, and we are going to use ads131a04 as the ADC converter. After reading the datasheet and some other related resources, we are a little bit confused about the GNDand CAP connetion. In the datasheet, it is said that GND is digital ground and CAP should be connected to GND via a 1uF cap. While in "ADS131A04 Evaluation Module User's Guide", it is shown that GND and CAP in among the analog domain. To make it even more confusing, in "TIDA-00810_CoverSheet.SchDoc ", the GND pin is connected to the digital ground, while CAP is connected to analog ground  via a 1uF cap. Please tell us the right way to connect these two pins, thank you!

figure 1, from datasheet

figure 2, evm board

figure 3, form TIDA-00810