An electronic integrated circuit which transformsa signal from analog (continuous) to digital(discrete) form. Analog signals are directly measurablequantities. Digital signals only have two states. For digitalcomputer, we refer to binary states, 0 and 1.
Microprocessors can only perform complexprocessing on digitized signals. When signals are in digital form they are lesssusceptible to the deleterious effects of additivenoise. ADC Provides a link between the analog world oftransducers and the digital world of signalprocessing and data handling.
ADC are used virtually everywhere where ananalog signal has to be processed, stored, ortransported in digital form. Some examples of ADC usage are digital voltmeters, cell phone, thermocouples, and digitaloscilloscope. Microcontrollers commonly use 8, 10, 12, or 16bit ADCs, our micro controller uses an 8 or 10 bitADC.
Dual Slope A/D Converter Successive Approximation A/D Converter Flash A/D Converter Delta-Sigma A/D Converter OtherVoltage-to-frequency, staircase ramp or singleslope, charge balancing or redistribution, switchedcapacitor, tracking, and synchro or resolver
The general smart concept was narrowed downto a specific goal: to improve the performance ofa high-speed, high-resolution ADC in terms ofthe speed/power/accuracy trade-off. Two key-factors were investigated that have thepotential to enable high-performance ADconverters for high-speed/high-resolutionapplications, namely: Open-loop circuitry. Time-interleaving.
In electronics, a digital-to-analog converter (DACor D-to-A) is a device that converts a digital(usually binary) code to an analog signal(current, voltage, or electric charge). An analog-to-digital converter (ADC) performs the reverseoperation. Signals are easily stored andtransmitted in digital form, but a DAC is neededfor the signal to be recognized by human sensesor other non-digital systems. A common use of digital-to-analog converters isgeneration of audio signals from digitalinformation in music players.
A simplified functional diagram of an 8-bit DAC
The pulse-width modulator, the simplest DAC type. A stable current or voltage is switched into a low-pass analog filter with a duration determined by thedigital input code. This technique is often used for electric motor speedcontrol, but has many other applications as well.