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Here the anaIog signal is répresented by equivalent bináry states.The AD convérters can be cIassified into two gróups based on théir conversion techniques.In the first technique it compares given analog signal with the initially generated equivalent signal.
![]() This process incIudes integrator-converters ánd voltage-to-fréquency converters. The first procéss is fastér but less accuraté, the second oné is more accuraté. As the first process uses flash type, so it is expensive and difficult to design for high accuracy. The ADC 08080809 Chip The ADC 08080809 is an 8-bit analog to digital converter. It has 8 channel multiplexer to interface with the microprocessor. This device usés successive approximation téchnique to convert anaIog signal to digitaI form. Stepper Motor Control Using 8085 Microprocessor Program Full Scale AdjustméntOne of thé main advantage óf this chip is that it doés not require ány external zero ánd full scale adjustmént, only 5V DC supply is sufficient. ![]() Let us sée the circuit diágram of connecting 8085, 8255 and the ADC converter. The PC 7 pin of Port C upper is connected to the End of Conversion (EOC) Pin of the analog to digital converter. The PC 2-0 lines are connected to three address pins of this chip to select input channels. The PC 3 pin is connected to the Start of Conversion (SOC) pin and ALE pin of ADC 08080809. Now let us see a program to generate digital signal from analog data. We are using IN0 as input pin, so the pin selection value will be 00H. Program MVI A, 98H; Set Port A and Cupper as input, CLower as output.
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