My project use STM32F030K6T6's ADC as AC 230v energy meter then upload to my website's server via ESP-07S. Now my design use HLK-PM01 AC-DC 5v and AMS1117 3.3v to power both STM32 and ESP-07S. Folllow AN2834 each VDD add 100nF ceramic cap + 4.7mF tantalum, VDDA add 1uF tantalum + 10nF Ceramic, esp's VDD add 100nF Ceramic. I think ESP need power depend on wifi transmitting and maybe it cause ADC accurate. Is AMS1117 good for ADC accurate? Do I need to change to low noise LDO? If Yes, which one is suitable or any solutions? ESP need around 300 - 400mA
Sorry for my bad English
Thanks
