Features 1.Onboard switched-capacitor successive-approximation analog-to-digital converter TLC1543 resolution : 10Bit analog input : 11ch (AIN0 ~ AIN10) Samples Per Second (SPS) : 38K Serial port 2.Reference voltage pins (REF+, REF-) allow user to select a proper reference voltage 3.Only 3 IOs are required to use this module, suit for systems that dont have sufficient IOs but need multi analog inputs ADC 4.Operating voltage : 3.3V - 5.0V 5.Dimension : 43mm × 23mm