I am working with two distance sensors 2d120(analog output), 2y0a21(digital output). In those two datasheets, they had written that 2d120(analog) requires analog interface and 2y0a21(digital) requires digital interface. Currently, i am using only 2y0a21(digital output) sensor in my project work. Even they had written explicitly in datasheet that it is producing digital output, then why i want to use ADC converter anagin. And what does it mean Analog interface?