SN8P275X Series
8-bit micro-controller build-in 12-bit ADC
SONiX TECHNOLOGY CO., LTD
Page 141
Version 0.7
11.8 ADC CIRCUIT
MCU
VCC
GND
VREFH
AINn/P4.n
VDD
VSS
0.1uF
Analog Signal Input
47uF
0.1uF
ADC reference high voltage is from VDD pin. The VERFH should be from MCU’s VDD pin. Don’t connect from main
power.
MCU
VCC
GND
VREFH
AINn/P4.n
VDD
VSS
0.1uF
Analog Signal Input
0.1uF
47uF
Reference High Voltage Input
ADC reference high voltage is from external voltage. The capacitor (47uF) between VREFH and VSS is necessary to
stable VERFH voltage.