(15 points: 5 points each) Draw the block diagram of a successive approximation analog-to- digital converter (SA-ADC) and explain its operation. ADC & DAC 1. Briefly describe 3 common techniques for A/D conversion within an ADC (i.e. The successive-approximation converter is one of the oldest and most widely used types of ADC. Successive Approximation Conversion Rate 10 10K 100K 1M 10M 100M100 1K 24 20 16 12 8 Converter Resolution (bits) ADC Technologies - ∆Σ Advantages •High Resolution •High Stability (averages and filters out noise) •Low Power •Low cost Disadvantages •Cycle-Latency •Low Speed Pipeline SPS ADS1610 – 10 M 16-bit ADS1672 – 625k 24-bit ADS1675 – 4 M 24-bit Let’s look at each of them: Successive Approximation ADCs (SAR) The “bread and butter” ADC of the DAQ world is the SAR analog-to-digital converter (Successive Approximation Register). 22. This means a long conversion time. A successive approximation ADC uses 1 comparator and counts towards the signal. At each stage of the story, results are too hot, too cold, or just right, too big, too small, or just right, etc. A direct-conversion ADC uses a bank of comparators to instantaneously convert the signal. Instead of counting up in binary sequence, this register counts by trying all values of bits starting with the most-significant bit and finishing at the least-significant bit. The testbench includes the test signal generators and the time domain scopes and spectrum analyzer for measurement purposes. It is easy to design and cost is low. The test signal is either a two-ton… You can measure N voltages one after the other, but that’ll take N times as much time. The block diagram of an ADC is shown in the following figure −. The digital signal is represented with a binary code, which is a combination of bits 0 and 1. Charge-redistribution successive-approximation ADC One method of addressing the digital ramp ADC’s shortcomings is the so-called successive-approximation ADC. SHA CONTROL LOGIC: SUCCESSIVE APPROXIMATION REGISTER DAC (SAR) TIMING START EOC, DRDY, Each has its own advantages and disadvantages and thus suitability for certain applications. CONVERT. 1) Successive approximation is one of the most widely and popularly used ADC technique. Set the switches to their default positions, selecting the two-tone source and the ideal DAC model. 2) Figure 1 shows the block diagram of successive approximation DAC. In this the analog to digital signal converted into time and the time can be easily digitized. And it won't be able to follow a signal that makes "jumps" correctly. Disadvantages:It has initially N clock cycles delay before the appearance of first digital output, the accuracy of the design depends on the most significant stage and if errors are not corrected initially those errors would be propagated throughout the conversion process. A successive approximations ADC has much in common with the children's classic, "The Story of the Three Bears." Analog and Digital Signal 772 Words | 4 Pages. Limitation #2 - An ADC can only be used with one pin at a time. 2)The construction is simple and easier to design. It uses an efficient “code search” strategy to complete n-bit conversion in just n-clock periods. In order to process ac signals, SAR ADCs must have an input sample-and-hold (SHA) to keep the signal constant during the conversion cycle. List and discuss a meaningful application where you would need to implement both an ADC and a DAC. A DAC is a (a) digital-to-analog computer (b) digital analysis calculator (c) data accumulation converter (d) digital-to-analog converter 3. The only change in this design is a very special counter circuit known as a successive-approximation register.. Successive approximation ADC 1 Successive approximation ADC A successive approximation ADC is a type of analog-to-digital converter that converts a continuous analog waveform into a discrete digital representation via a binary search through all possible quantization levels before finally converging upon a digital output for each conversion. For best accuracy often a track-and-hold circuit is inserted in front of the ADC input. Which of following is not a type of ADC? +12V to -12V), but there is an infinite number of values within that continuous range. With a neat block diagram, explain the working of two bit flash type analog to digital Converter. • Disadvantages: Still multiple clock periods for conversion. Central to this processing function in the Industrial Internet of Things is the analog to digital converter (ADC).Adesto has a large family of silicon-proven SAR ADC and other architecture devices. Successive Approximation), and discuss the advantages and disadvantages of each approach. II – Successive Approximation ADC - Comments • Advantages: Simple to implement (H/W or S/W). The following article takes the knowledge of advantages and disadvantages of the pipeline architecture and compares its features with four of the most popular architectures (flash, dual-slope, sigma-delta, and successive approximation) for analog-to-digital converters (ADCs). Disadvantages Higher resolution successive approximation ADC’s will be slower Speed limited to ~5Msps The successive approximation type ADC aims at approximating the analogue signal to be digitized by trying only one bit at a time. Voltages on multiple pins need to be measured one after the other (this is usually not such a big deal if the ADC … 4] Successive approximation ADC: Fig 8: Sigma delta ADC. 7. It performs conversions on command. An analog signal is a continuous signal that contains time-varying quantities, such as temperature or speed, with infinite possible values in between An analog signal can be used to measure changes in some physical phenomena such as light, sound, pressure, or temperature. There are some disadvantages of ramp type DVM (digital voltmeter) which are given below, The accuracy of the system is reduced by the drift and offset of two comparators. But working process of Successive Approximation Type ADC is quite different. Design a suitable D/A converter to convert 8 … Thus it takes much shorter conversion time than counter type ADC. I discussed counter type adc and flash type adc on my early post. Also determine the conversion time of 8bit and 16 bit Successive Approximation type Analog to digital Converter if its clock frequency is 50Hz. Open the system MSADCSuccessiveApproximation. In fact, these converters are often integrated into microcontrollers. Typical conversion time is 100ns or less. Basically the swing of ramp is in volt. This is needed for many ADC types (like successive approximation ADC), but for Flash ADC's there is no real need for this, because the comparators are the sampling devices. ANALOG AND DIGITAL SIGNAL 1.1 Analog signal An analog or analogue signal is any continuous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity, i.e., analog to another time varying signal. The successive approximation ADC is much faster than the digital ramp ADC because it uses digital logic to converge on the value closest to the input voltage. Working Process. What are the advantages and disadvantages of SA-ADC? 23. Disadvantages: 1)It is not suitable for higher number of bits. The basic successive approximation ADC is shown in Figure 1. ADC &DAC Ishraq Madi Jboor Noor Al_huda Mahir 2. Disadvantages: Still … The top-level model consists ofa testbench and the device under test. Sine Wave Random- Periodic The device under test, highlighted in blue in the model, contains a Track and Hold:, a Comparator, control logic, and charge scaled DAC. Successive Approximation ADC. 9. Successive Approximation Advantages Capable of high speed and reliable Medium accuracy compared to other ADC types Good tradeoff between speed and cost Capable of outputting the binary number in serial (one bit at a time) format. A comparatorand a DACare used in the process. An ADC busy with one measurement can’t do another measurement at the same time. This article discusses the corresponding characteristics, uses, advantages and disadvantages, and typical applications of analog vs. digital signals. Analog Signal An analog signal is time-varying and generally bound to a range (e.g. This is likely because this ADC has a faster conversion time than the other methods with the exception of the flash ADC. (a) Flash ADC (b) Dual slope ADC (c) Recessive approximation ADC (d) sigma-delta ADC 2. Advantages: 1)It is the fastest type of ADC because the conversion is performed simultaneously through a set of comparators, hence referred as flash type ADC. Observe that in the figure shown above, an Analog to Digital Converter (ADC) consists of a single analog input and many binary outputs. The disadvantage, however, is the time needed to stabilize as a new conversion value is directly proportional to the rate at which the analog signal changes. An Analog to Digital Converter (ADC) converts an analog signal into a digital signal. Out of the ADCs this article covers, the successive approximation analog to digital converter is one of the more popular ones. 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