An analog-to-digital converter is a device which converts continuous signals to discrete digital numbers. Typically, an ADC is an electronic device that converts an input analog voltage or current to a digital number proportional to the magnitude of the voltage or current. The output is taken on the LED s. This is an intermediate circuit, which finds lot of applications.

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This tutorial will provide you basic information regarding this ADC, testing in free run mode and interfacing example with with sample program in C and assembly.

This part of the tutorial was written by Chinmay Das. Normally analogue-to-digital converter ADC needs interfacing through a microprocessor to convert analogue data into digital format. This requires hardware and necessary software, resulting in increased complexity and hence the total cost.

The circuit of A-to-D converter shown here is configured around ADC , avoiding the use of a microprocessor. It works on the principle of successive approximation. It has a total of eight analogue input channels, out of which any one can be selected using address lines A, B and C. However, the circuit shown here is built to operate in its continuous mode without using any microprocessor. The input control signal SC, being active-low, initiates start of conversion at falling edge of the pulse, whereas the output signal EOC becomes high after completion of digitization.

As the conversion starts, EOC signal goes high. Thus, it provides continuous 8-bit digital output corresponding to instantaneous value of analogue input. The ADC IC requires clock signal of typically kHz, which can be easily derived from an Astable multi-vibrator constructed using inverter gates. Since ADC works in the continuous mode, it displays digital output as soon as analogue input is applied.

The decimal equivalent digital output value D for a given analogue input voltage Vin can be calculated from the relationship. If you have any queries, doubts or feedback on this tutorial please share in our discussion forum. If you want us to write tutorial for more devices please let us know in the forum. Rickey's World Toggle sidebar. Table of Content.

Note: Reset and oscillator circuit is not shown in above circuit, But its needed for Hidden category: RW Templates.


ADC Interfacing with 8051

The data we process in a microcontroller normally deals with digital signals. But there may a situation where we have to deal with external inputs such as analog signals. All most all the input signals from physical sensors are of analog signals. In such cases, we can interface the microcontroller with an external device such as an ADC to convert the analog signal to a digital signal. Because our microcontrollers can only understand 0 and 1.


Interfacing ADC0808 To 8051

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