Analog to Digital Converter .pptx
- 1. Analog to Digital Converter Dr.R.Hepzi Pramila Devamani, Assistant Professor of Physics, V.V.Vanniaperumal College for Women, Virudhunagar.
- 2. Analog Signal • A signal for conveying information which is a continuous function of time is known as analog signal. • An analog signal is typically represented by a sine wave function. • An analog signal is a voltage, current, or physical quantity that continuously and infinitely varies in accordance with some time-varying parameter. • For example, radio waves, television waves, or sound waves are all examples of analog signals.
- 4. Digital Signal • A signal which is a discrete function of time, i.e. non- continuous signal, is known as digital signal. • A digital signal is typically represented by a square wave function. • A digital signal encodes data as a sequence of discrete values. • A digital signal can only have one value from a finite set of possible values at any given time.
- 6. Analog Signals: Advantages • Analog signals are easier to process. • Analog signals best suited for audio and video transmission. • Analog signals are much higher density, and can present more refined information. • Analog signals use less bandwidth than digital signals. • Analog signals provide a more accurate representation of changes in physical phenomena, such as sound, light, temperature, position, or pressure. • Analog communication systems are less sensitive in terms of electrical tolerance.
- 7. Analog Signals: Disadvantages • Data transmission at long distances may result in undesirable signal disturbances. • Analog signals are prone to generation loss. • · Analog signals are subject to noise and distortion, as opposed to digital signals which have much higher immunity. • · Analog signals are generally lower quality signals than digital signals.
- 8. Digital Signals: Advantages • Digital signals can convey information with less noise, distortion, and interference. • Digital circuits can be reproduced easily in mass quantities at comparatively low costs. • Digital signal processing is more flexible because DSP operations can be altered using digitally programmable systems. • Digital signal processing is more secure because digital information can be easily encrypted and compressed. • Digital systems are more accurate, and the probability of error occurrence can be reduced by employing error detection and correction codes. • Digital signals can be easily stored on any magnetic media or optical media using semiconductor chips. • Digital signals can be transmitted over long distances.
- 9. Digital Signals: Disadvantages • A higher bandwidth is required for digital communication when compared to analog transmission of the same information. • DSP processes the signal at high speeds, and comprises more top internal hardware resources. This results in higher power dissipation compared to analog signal processing, which includes passive components that consume less energy. • Digital systems and processing are typically more complex.
- 10. Analog Signals: Applications Analog Signals • Audio recording and reproduction • Temperature sensors • Image sensors • Radio signals • Telephones • Control systems
- 11. Digital Signals: Applications Digital Signals • Communication systems (broadband, cellular) • Networking and data communications • Digital interfaces for programmability
- 12. Analog to Digital Converter • The digital to analog conversion and analog to digital conversion techniques are important tools in the digital data processing systems. • The digital to analog conversion. technique involves conversion of digital information into an equivalent analog Information. • Digital to analog converter acts as a decoding device since it operates on the output of a digital system. • Using analog to digital conversion techniques, the analog information is converted into its equivalent binary number which is in the digital form. • In general, the analog to digital converter acts as an encoder.
- 13. Analog to Digital Converter
- 14. Application of ADC • Used together with the transducer. • Used in computer to convert the analog signal to digital signal. • Used in cell phones. • Used in microcontrollers. • Used in digital signal processing. • Used in digital storage oscilloscopes. • Used in scientific instruments. • Used in music reproduction technology etc.
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