How does adc0804 work

But still its a great resource to start with analog to digital converters. ADC pin out description. Reference means that after this much amount of voltage change at input, output must increase by 1 or the set limit.

Voltage span means that the ADC can measure in the range for example for the above case from volts. If now output is 2 then after How to use ADC analog to digital converter? Make Cs chip select low 0 to activate the adc Make WR write pin low 0. Make WR write pin high 1 after some delay small delay. This low to high impulse at WR pin starts your conversion. Now check the INTR interrupt pin if it is high 1 conversion is running if it is low 0 the conversion is over.

Their bandwidth can be fined by their sample rate sample rat is the elimination of a continuous-time signal to a discrete-time signal. The signal to noise ratio can be measured by the resolution resolution of the converter designates the number of discrete values it can create over the series of analog values , accuracy of signal, aliasing It is an effect that makes different signals to become indistinguishable. So, friends, it is the detailed tutorial on the ADC if you have any question about ask in comments.

The ADC always have lots of noise, this noise can greatly affect the performance so we use uF capacitor for noise filtration. Without this there will a lot of fluctuations at output. The input analog signal has a limit to its value. This limit is determined by reference value and chip supply voltage.

The measuring voltage cannot be greater than reference voltage and chip supply voltage. That means say we want to measure an analog parameter with a maximum value of 5V, we need Vref as 5V fro that we need to provide a voltage of 2. Here we are going to feed a 5V variable voltage for measuring so we will give a voltage of 2. For 2. The drop from the later resistor is taken as a Vref. The chip works on RC Resistor Capacitor oscillator clock.

As shown in circuit diagram, C1 and R2 form a clock. The important thing to remember here is the capacitor C1 can be changed to a lower value for higher rate of ADC conversion. However with speed there will be a decrease in accuracy. So if the application requires higher accuracy choose the capacitor with higher value.