digital to analog (DAC) & analog to digital converter (ADC)
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This document summarizes different types of digital to analog converters (DACs). It discusses the basic concept of converting digital data to analog signals by using a circuit that can produce analog outputs. It then describes several DAC specializations: 1) Binary weighted DAC which uses a reference voltage and weighted resistors to produce analog outputs corresponding to the digital input bits. 2) Flash type ADC which uses a voltage divider network and parallel comparators to directly convert an entire digital word to an analog voltage very quickly. 3) Successive approximation ADC which uses a comparator and feedback loop in a step-wise process to iteratively approximate the analog output voltage, providing a tradeoff between speed and circuit complexity.
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An ADC converts an analog signal to a digital signal, while a DAC performs the opposite conversion from digital to analog. ADCs and DACs are needed because signals can be more easily stored and transmitted digitally, but many systems require analog signals. Common uses of DACs include generating audio signals from digital music files. ADCs and DACs allow the analog world to interface with the digital world handled by processors and computers.
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ANALOG TO DIGITAL CONVERTERS
Dr. Ambedkar Institute of Technology in Bengaluru. The document discusses analog to digital converters (ADCs), which convert continuous analog voltages to discrete digital codes. It describes several types of ADC architectures, including flash ADCs, pipeline ADCs, successive approximation ADCs, and oversampled ADCs. For flash ADCs, it provides details on their design and operation, accuracy issues related to resistor matching and comparator offsets, and discusses two-step flash ADCs which reduce component count. Operational amplifiers used in the amplification stage also impact accuracy.
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digital to analog (DAC) & analog to digital converter (ADC)
- 1. UNIT-5 Mohammad Asif Iqbal Assistant Professor, Deptt of ECE, JETGI, Barabanki
- 4. Basic concept for Digital to Analog conversion Have a look at Binary to Decimal conversion So in order to convert digital data into analog we need a circuit which is capable of producing output similar to this.
- 5. DAC Specializations Vref So from the previous expression we may conclude that our Vo is a function F of Vref. Vo = F ×Vref Consider an N-bit data, So, total number of combinations = 2^N The resolution of either a digital-to-analog converter (DAC) or an analog-to-digital converter (ADC) is the measure of how finely its output may change between discrete, binary steps. More number of combinations mean more number of levels…
- 7. At output you will begetting that pulse as long as output of the comparator is high. Dual slop ADC(SLOW) Heretwopointsareworthnoting. 1. We will use the concept of virtualground 2. No current will flow inside the Op-Amp Do u remember? Its a simple comparator. Commentaboutitsoutput…..At output you will begetting that pulse as long as output of the comparator is high. Its your counter V1 V2 t V2>V1 t1 t2 Here you can observe , we havefixed count with variable slop. At output you will begetting that pulse as long as output of the comparator is high. Here the count is different but the slop is constant . Why?? Give the reason of this negative slop.
- 8. Flash type ADC (FASTEST) 8V 7V 6V 5V 4V 3V 2V 1V Voltage divider network Comparator Parity encoder 3.5V 0 0 0 1 0 1 1 0 1 1 Why/how??
- 9. Successive approximation DAC(Trade off between speed and hardware) comparator Its a simple DAC SAR 3.5V 1 0 0 0 1 0 0 0 8 0 0 1 0 0 0 1 0 0 4 0 0 1 0 0 0 1 0 2 1 0 0 1 1 0 0 1 1 3 0 0 1 1
- 10. THANK YOU!