sampling, quantization and coding. Flash Analog to Digital Converter. difference between FDM and OFDM high precision external components. This preview shows page 13 - 15 out of 20 pages. of a typical Ramp type Analog-to Digital Converter. DAC. Advantages: It is more accurate ADC type among all. analog voltage and it is equal to n*TCLK. Counter type ADC design is less complex, so the cost is also less; Counter type ADC Disadvantages. There are mainly two steps involves in the process of conversion. For n bit dual slop type of ADC, Vr = ( 2 n /N ) * Va Total time for conversion of input Va is expressed as follows: Total Time = (2 n + N)* T CLK. Typical conversion time is 100ns or less. The flash method uses comparators that compare reference voltages with the analog input voltage. It is easy to design and cost is low. Counter. Introduction to Digital to analog converter. List the broad classification of ADCs. CHAPTER 6: CONVERTERS Introduction There are two basic type of converters, digital-to-analog (DACs or D/As) and analog-to-digital (ADCs or A/Ds). What is the main drawback of a dual-slop ADC? Total Time = (2n + N)* TCLK. Compared to these, a Flash converter is also quite simple and, apart from the analog comparators, only requires logic for the final conversion to binary. So, at a time one converter operates and the reactor is not required between the converters. One significant enhancement made to the dual-slope converter is automatic zero correction. Circuit shown is a 4 bit Digital Ramp ADC. Disadvantages: It is slow in conversion due to oversampling. Modern converters like the MAX109/MAX104 employ an input track-and-hold in front of the ADC along with an encoding technique that suppresses sparkle codes. The output of all the comparators is like a thermometer: the higher the input value, more comparators have their outputs high from bottom to top. Difference between TDD and FDD Thus they ma be difficult to follow. There may be conflicts if the next i/p is sampled before completion of one process. The basic design of the dual-slope integrating ADC has a limitations in linearity, conversion speed and resolution. Course Hero is not sponsored or endorsed by any college or university. Figure-2 depicts block diagram of parallel comparator ADC or 2 bit flash ADC. 2)The construction is simple and easier to design. Total time for conversion of input Va is expressed as follows: When compared to other types of ADC techniques, the dual-slope method is slow but is quite adequate for a digital voltmeter used for laboratory measurements. If an ADC performs the analog to digital conversion by an indirect method, then it is called an Indirect type ADC. 10-bit resolution corresponds to 4.88mV per step for a 5V range. This is the main drawback of dual slope ADC. Successive Approximation ADC Comparision of different types of ADC/Digital voltmeter Related posts: An analog-to-digital converter (ADC) is a system that converts an analog signal to ...