ANALOG-TO-DIGITAL CONVERTER BASED ON THE TRANSIENT PROCESS IN RC-CIRCUIT
Aleksandr Vostrukhin, Elena Vakhtina · 2015
ADC based on using the transient process in RC-circuit patented by the authors is presented. This ADC is conditionally called RC-ADC. The task was: to compare the conversion speed of RC-ADC and successive approximation ADC. An experimental sample of RC-ADC was built on the basis of ATmega16 AVR Microcontroller. As successive approximation ADC has been considered 10 bit ADC of AVR Microcontrollers.During the study of RC-ADC there were obtained results on the basis of which it could be affirmed, that the RC-ADC with the Microcontroller clock frequency of 10 MHz is not inferior in conversion speed of successive approximation ADC with the clock frequency of 100 kHz. RC-�Dabsolute error is slightly higher than ADC AVR Microcontroller error. The article describes the sequence of time calculation needed for Microcontroller for one cycle of analog-to-digital conversion in RC-ADC. There are general Algorithm of RC-ADC work, timing Diagram for explaining the operation of RC-ADC and Oscillogram of capacitor voltage change in RC-circuit. This proposed RC-ADC can be implemented on the basis of the following elements: integrated circuits, programmable logic integrated circuits and Microcontrollers. Perhaps, the considered RC-ADC in comparison with the known ADC will be more versatile and simple for technical implementation.