Resolution of a converter is a smallest change in voltage which may be produced at the output. Give the advantages of integrating type ADC. Integrating type ADC perform conversion in an indirect manner by first changing the analog input signal to a linear function of time or frequency and then to digital code.
Here accuracy is more. Binary ladder DAC:. Requires wide range of resistor values. R-2R ladder DAC:. Only two resistor values are required. Define conversion time of DAC. It is the total time required to convert digital signal into analog signal. It is the maximum deviation between the actual converter output and the ideal converter output. Monotonic DAC is the one whose analog output increases for an increase in. Which is the fastest ADC?
State the reason. What is the main drawback of dual slope ADC. Long conversion time. State the disadvantage of that type of converter. It uses a integrator to generate a sawtoothwafeform which is then compared against the analog input by a comparator.
Conversion speed is more. What is over sampling? Oversampling converters sample the analog signal at a rate much higher than the sampling rates normally required with nyquist converters. What would be produced by a DAC whose output range is v and whose input. Determine the number of comparators and resistors required for 8 bit flash type ADC.
Mention two advantages of R-2R ladder type Digital to Analog converter when compared to weighted resistor type Digital to Analog Converter. Which is the fastest ADC and Why? State the advantages of dual slope ADC:. The conversion time of a successive approximation type ADC is given by. Tcconversion time nno.
LSB of its final value following a code change at the input usually a full scale cha ge. Find the resolution of an 8-bit DAC. What are limitations of Flash type ADC? Flash type ADC employs 2n-1 comparators for conversion which makes it costlier which tradeoffs in the speed of conversion. Name the essentials parts of a DAC. Easier to build accurately as only two precision mental film resistors are required. This avoids any slo down effects by stray capacitances. With increasing output bits the circuit becomes larger.
The switches used are noted for the sources of errors. A sample and hold circuit is one which samples an input s gnal and holds on to its last sampled value until the input is sampled again. What are the specifications of data convertors?
Draw and explain the functional diagram of the successive approximation ADC converter. Explain the principle of operations. Explain the working of flash ADC. The maximum integrator output voltage should be -8V when the counter has cycled through 2n counts. The capacitor used in the integrator is 0. Find the value of the resistor R of the integrator.
How many bits are required to design a DAC that can have a resolution of 5mV? Explain delta sigma modulation with required diagram. The maximum integrator output voltage should be -8V when the counter has recycled through n 2 counts.
The capacitor used in the integrator is0. Find the value of resistor R of the integrator. Briefly explain its construction and application.
Describe the operation of dual slope and successive approximation type ADC. What are the advantages of dual slope ADC? Sketch the corresponding equivalent circuits and hence obtain the equation for output. Calculate to if. The process of converting an analog signal to digital can be done in several ways.
So, a simple ADC can be designed with the help of discrete components. One of the major benefits of ADC converter is the high data acquisition rate even at multiplexed inputs. Dynamic characteristics of the high-performance ADCs are improved measurement repeatability, low power consumption, precise throughput, high linearity, excellent Signal-to-Noise Ratio SNR , and so on. A variety of applications of the ADCs are measurement and control systems, industrial instrumentation, communication systems, and all other sensory-based systems.
Classification of ADCs based on factors like performance, bit rates, power, cost, etc. The block diagram of ADC is shown below which includes sample, hold, quantize, and encoder.
The process of ADC can be done like the following. First, the analog signal is applied to the first block namely a sample wherever it can be sampled at an exact sampling frequency. The amplitude value of the sample like an analog value can be maintained as well as held within the second block like Hold. The hold sample can be quantized into discrete value through the third block like quantize. Finally, the last block like encoder changes the discrete amplitude into a binary number.
In ADC, the conversion of the signal from analog to digital can be explained through the above block diagram. In the sample block, the analog signal can be sampled at an exact interval of time.
The samples are used in continuous amplitude and hold real value however they are discrete with respect to time. While converting the signal, the sampling frequency plays an essential role. So it can be maintained at a precise rate. Based on the system requirement, the sampling rate can be fixed. In ADC, this is the third block which is mainly used for quantization.
The main function of this is to convert the amplitude from continuous analog into discrete. The value of continuous amplitude within hold block moves throughout quantize block to turn into discrete in amplitude.
Now, the signal will be in digital form because it includes discrete amplitude as well as time. The final block in ADC is an encoder that converts the signal from digital form to binary.
We know that a digital device works by using binary signals. So it is required to change the signal from digital to binary with the help of an encoder. So this is the entire method to change an analog signal to digital using an ADC. The time taken for the entire conversion can be done within a microsecond.
There are many methods to convert analog signals to digital signals. These converters find more applications as an intermediate device to convert the signals from analog to digital form, display output on LCD through a microcontroller. Now we are going to see an ADC of It is an 8-bit converter with a 5V power supply. It can take only one analog signal as input. The digital output varies from ADC needs a clock to operate. The time taken to convert the analog to digital value depends on the clock source.
Pin2 is the input pin — High to low pulse brings the data from the internal register to the output pins after conversion. To minimize cost one of the design goals was to devise techniques requiring a minimum of precision parts.
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