Tutorials Main Page. Interfacing ADC (ADC) with Submitted by admin on 5 September – am. Tutorials Main Page. This is to certify that the thesis entitled “Analog to Digital Convertor Interface with Microcontroller”, submitted by Debanand Majhi (Roll. No. EE). does not have the inbuilt ADC and we will be using the external 8-bit ADC ie. ADC/ADC ADC is an 8-bit Successive Approximation ADC.

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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.

Want ADC sample code ()

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 ADCavoiding 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.

Interfacing ADC/ADC with Microcontroller

The ihterfacing 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.

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You’ll find it identical to C because it is identical so if you are thinking to start working in C language then its a good time: If you have any queries, doubts or feedback on this tutorial please share in our discussion forum.

Interfacing ADC0808 (ADC0809) with 8051

If you want us to write tutorial for more devices please let us know in the forum. Rickey’s World Toggle sidebar.

Reset and oscillator circuit is not shown in above circuit, But its needed for Retrieved from ” http: Pages with ignored display titles Analog to Interfacin Converter Tutorials.