Hi Jikang, Happy to help and apologies for not understanding the initial question. Section 11.3 shows a bipolar power supply configuration. The 1uF capacitor is connected between AVDD and GND, then another capacitor between AVSS and GND. Additionally, you could look at the ADS1299EVM User's Guide to see the schematic for the EVM. You can have an AGND and a DGND, but we recommended connecting them using a 0Ohm resistor.
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