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DAC , Digital to analog Converter

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DAC , Digital to analog Converter

DAC , Digital to analog Converter

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    DAC , Digital to analog Converter DAC , Digital to analog Converter Presentation Transcript

    • Digital-to-Analog Converter (DAC)
    • A digital-to-analog converter (DAC or 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 reverse operation .
    • Basic ideal operation The DAC fundamentally converts finite-precision numbers (usually fixed-point binary numbers) into a continuously varying physical quantity, usually an analogue electrical voltage. In an ideal DAC, the numbers are output as a sequence of  impulse s, that are then filtered by a reconstruction filter. This would, in principle, reproduce a sampled signal precisely up to the Nyquist frequency, although a perfect reconstruction filter cannot be practically constructed as it has infinite phase delay; and there are errors due to quantisation .
    • DAC Characteristics: 1. Resolution 2. Offset Error 3. Gain Error 4. Monotonicity 5. Relative Accuracy
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    • DACs are used in many other applications, such as voice synthesizers, automatic test system, and process control actuator. In addition, they allow computers to communicate with the real (analog) world.
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