This pin is used to tell the ADC to start the conversion. If Vref(+) has an input voltage 5v and Vref(-) has a voltage of 0v then the step size will be 5v-0v/2 8= 15.53 mv. Here Vref(+) has a higher voltage, and Vref(-) has the lower voltage. These two pins are used to provide the upper and the lower limit of voltages which determine the step size for the conversion. It uses a clock frequency of 20Mhz, and using this clock frequency it can perform one conversion in 100 microseconds. ClockĪs mentioned earlier, the 0808 does not have an internal clock and needs an external clock signal to operate. In most cases, the ADC uses 5V DC to power up. These two pins are used to provide the required voltage to power the microcontroller. The ADC has eight output pins that give the binary equivalent of a given analog value. A B C Selected analog channel ALE pin 0 0 0 INT0 Low to High pulse 0 0 1 INT1 Low to High pulse 0 1 0 INT2 Low to High pulse 0 1 1 INT3 Low to High pulse 1 0 0 INT4 Low to High pulse 1 0 1 INT5 Low to High pulse 1 1 0 INT6 Low to High pulse 1 1 1 INT7 Low to High pulse Output pins (D0-D7)
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