ADC interfacing with Introduction Analog to digital converters find huge application as an intermediate device to convert the signals from analog to digital form. These digital signals are used for further processing by the digital processors. Various sensors like temperature, pressure, force etc. Why we are using ADC for Microcontroller? So we have to use external ADC. There are many ADCs available.

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For interfacing these sensors to microcontrollers we require to convert the analog output of these sensors to digital so that the controller can read it. Why we are using ADC for Microcontroller? So we have to use external ADC. There are many ADCs available. ADC is a Successive approximation type with 8 channels i.

I mean, In ADC we can give only one analog input. But in ADC we can give 8 analog inputs. So if you want to interface more number of analog sensors, please select this ADC ADC is an 8 bit analog to digital converter with eight input analog channels, i.

The input which is to be converted to digital form can be selected by using three address lines. The step size is decided based on set reference value. Step size is the change in analog input to cause a unit change in the output of ADC.

The default step size is The ADC needs some specific control signals for its operations like start conversion and bring data to output pins. When the conversion is complete the EOC pins goes low to indicate the end of conversion and data ready to be picked up. Features Easy interface to all microprocessors Operates ratio metrically or with 5 V DC or analog span adjusted voltage reference No zero or full-scale adjust required 8-channel multiplexer with address logic 0V to 5V input range with single 5V power supply Outputs meet TTL voltage level specifications Standard hermetic or molded pin DIP package pin molded chip carrier package Pin Diagram.


8051 – ADC0804 Interfacing

These devices are also designed to operate from common microprocessor control buses, with tri-state output latches driving the data bus. It eliminates the need for external zero and full-scale adjustments. Easy to interface to all microprocessors. It operates on single 5V power supply. Output meet TTL voltage level specifications.


8051 – ADC0808 Interfacing

ADC Free running Circuit 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.

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