ESP32-P4: How to connect VDD_ANA

On the ESP32-P4, the VDD_ANA pin is used to supply power to the analog components of the chip.

Connect the VDD_ANA pin to a 3.3V power supply. The permissible voltage range for this pin is from 3.0V to 3.6V (absolute maximum rating of 3.6V). Supplying a higher voltage than 3.6V may destroy the chip.

Note that the VDD_ANA does not just supply the ADC, but is also likely to supply the internal PLL, internal reference voltage and potentially parts of the Wifi power supply.

You can just connect VDD_ANA to the same 3.3V power supply as VDD_LDO and VDD_DCDCC, however, isolating the using a small ferrite bead will increase stability & performance (keep in min)

You must place a 100nF decoupling capacitor as close as possible to the VDD_ANA pin and connect between the 3.3V supply and the ground plane.

Source: ESP32-P4 hardware design guide