Once ramp voltage reaches zero voltage, the ground comparator generates a pulse that will close the gate and hence counter.The another ground comparator compares the ramp voltage. The ramp voltage is decreasing in value.Once ramp voltage becomes equal to the input voltage, the input comparator output becomes high and generated pulse opens the gate.Now, the ramp voltage is compared continuously with the input analog voltage using input comparator.Initially, a ramp voltage is initiated as multivibrator sends a pulse to ramp generator.The block diagram of ramp type ADC is shown in figure1.Microcontrollers commonly use 8, 10, 12, or 16-bit ADCs, our micro controller uses an 8 or 10 bit ADC.įig2.Some examples of ADC usage are digital voltmeters, cell phone, thermocouples, and a digital oscilloscope.ADCs are used virtually everywhere where an analog signal has to be processed, stored, or transported in digital form.

ADC Provides a link between the analog world of transducers and the digital world of signal processing and data handling.

When signals are in digital form they are less susceptible to the deleterious effects of additive noise as compared to analog signals.

Microprocessors can only perform complex processing on digitized signals.

Digital signals only have two states i.e. The output of a microphone, the voltage at a photodiode or the signal of an accelerometer are the examples of the analog values that need to be converted so that a microprocessor can work with them.Īnalog signals are directly measurable quantities. For example, a sound picked up by a microphone into a digital signal. An analog-to-digital converter (ADC) is a system that converts an analog signal to a digital signal.

Rc digital to analog video converter