Ha0118e introduction this example shows how the internal dual slope adc function in the ht46r7xd1 device is used. Using the dual slope ad converter function in the ht46r7xd1. However, it generally has a long conversion time, so we propose an innovative. Therefore, the columnparallel singleslope architecture fig. It is unsure why americans use the letter m to represent slope. In the dualslope converter, an integrator circuit is driven positive and negative in alternating cycles to ramp down and then up, rather than being reset to 0 volts at the end of every cycle. The dualslope conversion improvement radojle radetic1, marijana pavlovkagadejev2, nikola milivojevic3 abstract.
Dual slope adcs are used in applications demanding high accuracy. As mentioned previously, the single slope ad has many similarities to the sar ad. An260a 20bit1 ppm linear slopeintegrating ad converter. What would a complete dual slope adc look like inside. Dmm basics dualslope adc posted on february 8, 20 by modemhead this is the first in a series of posts looking at how a digital multimeter actually works. Hence, at the end of t 1, the integrator output will be positive, and the output of the comparator v c will be 1. Write the disadvantage of single slope integrator adc. A dual slope ad converter operates by charging a capacitor from the input voltage during a fixed time, then discharging it to zero. Therefore, the columnparallel single slope architecture fig.
Dashed lines mean control to throw a switch or convey a pulse. This circuit consists of a comparator, output latches, successive. A complete device list and corresponding data sheets or these products can be found at. If the slope here means the slope of the transfer characteristic, it would be closely related to the linearity, gain and monotonous characteristic of the adc. Just point your phone with a straight arm downwards the slope and read out the measured angle.
In this video, the working of dual slope and single slope integrating adc is explained. Us10205463b1 dualgain singleslope adc with digital cds. The tc514 adds both a negative power supply converter and a 4input. Slope comes from the latin root slupan, for the word slip. Robert kiyosaki 2019 the speech that broke the internet keep them poor.
Numericalintegration techniques speed dualslope ad. This application enables you to quickly check what angle the ski slope has. This circuit consists of a comparator, output latches, successive approximation register sar and da converter. Precise calibration of dualslope adcs application note maxim. At the end of t 1, the tcu restarts the internal timer to measure the elapsed time period t 2. The dual slope adc dsadc is a type of analog todigital conversion with low input bandwidths. Dualslope adc architecture a dualslope adc dsadc integrates an unknown input voltage vin for a fixed amount of time tint, then deintegrates tdeint using a known reference voltage vref for a variable amount of time see figure 2. These similarities can be seen in the conceptual diagram of a singleslope system infigure 2.
An integrating adc in which the unknown signal is converted to a proportional time interval, which is then measured digitally. A block diagram of the circuit figure 1 includes a single primary li cell, a millivoltoutput bridge sensor, a differential amplifier, and the dualslope adc, plus correction circuitry for offset, zero, and span. The single slope adc suffers all the disadvantages. The dual slope adc dsadc is a type of analogtodigital conversion with low input bandwidths. Then a reference input is switched to the integrator, which integrates down from the level determined by the unknown until the starting level is. Abstract a lowpower singleslope analogtodigital converter. As a minimum, each device contains the integrator, zero. Integrating adc overview aka ramp and slope adc different flavors, e.
Write the disadvantage of single slope integrator adc and. Open a routing assembly and click piping edit route routing toolbar rightclick the sketch entity at the location where you want to add the slope and select add slope in the pipe slope propertymanager, under route segments, select the route segments to slope. This topic was completed in five fifty minute periods. The tc500 is the base 16bit max device and requires both positive and negative power supplies.
A dualslope adc, on the other hand, averages together all the spikes and dips within the integration period, thus providing an output with greater noise immunity. A line with a large slope, such as 25, is very steep. Dual slope adc architecture a dual slope adc ds adc integrates an unknown input voltage vin for a fixed amount of time tint, then deintegrates tdeint using a known reference voltage vref for a variable amount of time see figure 2. Numericalintegration techniques speed dualslope ad conversion figure 1. This greatly decreases the area necessary to implement the adc. Slope stability free slope stability software download. Difference between adc typescounter,flash,sar,dual slope. Mohanet al novel dualslope resistancetodigital converter 1015 shown in fig. The double dualslope multiplier is a multiplying analogtodigital converter based on the dualslope integrating converter. Numericalintegration techniques speed dual slope ad conversion figure 1. Sep 27, 2016 a dual slope adc ds adc integrates an unknown input voltage vin for a fixed amount of time tint, then deintegrates tdeint using a known reference voltage vref for a variable amount of time. Combine the power of autocad with the functional simplicity of a mathematically accurate slope analyzer.
Numericalintegration techniques speed dualslope ad conversion. Inverted dualslope adc boosts dynamic range edn asia. The sar adc a most modern adc ic and much faster than dual slope and flash adcs since it uses a digital logic that converges the analog input voltage to the closest value. An answer to this calibration drift dilemma is found in a design variation called the dualslope converter. Dual slope adc architecture a dual slope adc ds adc integrates an unknown input voltage v in for a fixed amount of time t int, then deintegrates t deint using a known reference voltage v ref for a variable amount of time see figure 2. During the 2nd slope negative slope the input voltage is disconnected and the counter begins.
One of the most important properties of a line is its slope. The key advantage of this architecture over the single slope is. To overcome this sensitivity to the component values, th e dual slope integrating architecture is used. Adc converter technologies may occasionally convert a spike or dip because it captures the signal repeatedly at a single point in time. An answer to this calibration drift dilemma is found in a design variation called the dual slope converter. We now consider the singleslope and the dualslope adcs. By watching this video, you will learn the following topics. Dec 11, 2014 if the slope here means the slope of the transfer characteristic, it would be closely related to the linearity, gain and monotonous characteristic of the adc. The tl507 is a lowcost singleslope analogto digital converter designed to convert analog inputvoltages between 0. Find the slope of a line given a graph or two points.
It is pretty slow, but its ability to reject highfrequency noise and fixed low frequencies such as 50 hz or 60 hz makes it. Figure5 depicts block diagram of dual slope integrating type adc. Background grades 15 saskatchewan curriculum geometry strand. The ex input signal is directly coupled to the comparator input with no filtering. In its basic implementation, the dualslope converter, the unknown input voltage is applied to the input of the integrator and allowed to ramp for a fixed time period the runup period. Dual slope converter an integrating adc in which the. As we graph lines, we will want to be able to identify di. The purpose of this work was to understudy the functionalities as well as the operations of the various converters adda converters with emphasis laid on the dual slope adcs. An integrating adc is a type of analogtodigital converter that converts an unknown input voltage into a digital representation through the use of an integrator. As mentioned previously, the singleslope ad has many similarities to the sar ad. This note explains the use of offset flipping for onthefly calibration of the adc. Well leave out the details of the countercontroller. Mar 22, 2014 the single slope analogtodigital converter ss adc is the most commonly used columnlevel adc for highspeed industrial, complementary metaloxide semiconductor cmosbased xray image sensors because of its small chip area the width of a pixel, its simple circuit structure, and its low power consumption.
We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files. For n bit dual slop type of adc, vr 2 n n va total time for conversion of input va is expressed as follows. The peak value attained contains the only clue but that is unknown to this type of adc. One of the many interesting architectures available is the dualslope integrator. The single and dualslope analog to digital converters. In its basic implementation, the dual slope converter, the unknown input voltage is applied to the input of the integrator and allowed to ramp for a fixed time period the runup period. A columnparallel dual gain single slope adc comprises an input for receiving a signal vin, a sampleandhold stage which receives vin and outputs sampled signal vin,samp, a comparator, a counter, and a ramp generator which generates highgain hg and lowgain lg ramps, with the ratio of the lg ramp slope to the hg ramp slope being greater than 1. Unlike a dualslope,this converter has no inherent noise rejection capability. The main purpose was to construct a 16bit dual slope ad converter with an input voltage of 5v. Since v c is high, the polarity of kx is taken as positive, and the tcu sets both s1 and. Mar 31, 2018 robert kiyosaki 2019 the speech that broke the internet keep them poor.
These similarities can be seen in the conceptual diagram of a single slope system infigure 2. It tells how steep a linear function is when graphed. Then, include all the different types of examples of finding slope and graphing a line with a particular slope. Singleslope ad example the main components of the singleslope system are the comparator, the constant current source for the external capacitor, and the free. We explain why the slightly more complicated dualslope adc is generally a better choice of adc than the singleslope converter. Single slope ad example the main components of the single slope system are the comparator, the constant current source for the external capacitor, and the free. We now consider the single slope and the dual slope adcs. Also be sure to include the slope formula and define it as vertical change over horizontal change as well. An example of sh circuit is given below the role of the capacitor is to be charged. The bottom border measures slope with a 50 meter contour interval. It is pretty slow, but its ability to reject highfrequency noise and fixed low frequencies such as. Both adcs make use of simple opamp circuits and control logic to do most of their work.
Slope is determined by comparing the distance between contour lines of the map with the reference lines on the edges of the ruler. The timer is used to set a charge up time after which the same timer is used to. Elegant in its simplicity, a dsadc dualslope analogtodigital converter employs an analog integrator coupled to a comparator and control logic to accumulate integrate the input signal, v in, for a fixed interval, t1 comprising the first slope then to switch the integrators input to a fixed negative reference, v ref, to. The top border of the ruler is designed to measure slope with a 20 meter contour interval. As a minimum, each device contains the integrator, zero crossing comparator and proc essor interface logic. The accurate correspondence of this adc s output with its input is dependent on the voltage slope of the integrator being matched to the counting rate of the counter the clock frequency. Two principal advantages of the dualslope adc are its.
Analogtodigital converter design guide highperformance, standalone ad converters for a variety of embedded systems applications design ideas in this guide are based on many of microchips adc products. In the dual slope converter, an integrator circuit is driven positive and negative in alternating cycles to ramp down and then up, rather than being reset to 0 volts at the end of every cycle. During the first slope positive slope the sampling time is a fixed value and therefore the duration gives no clue about what the input voltage is. Introduction to slope for middle years mathematics precis. A block diagram of the circuit figure 1 includes a single primary li cell, a millivoltoutput bridge sensor, a differential amplifier, and the dual slope adc, plus correction circuitry for offset, zero, and span. Dual slope converter an integrating adc in which the unknown. Dualslope adcs are used in applications demanding high accuracy. We explain why the slightly more complicated dual slope adc is generally a better choice of adc than the single slope converter. The dualslope adc dsadc is a type of analogtodigital conversion with low input bandwidths. If a filter was placed at the input substantial time lag due to settling requirements. The single slope adc suffers all the disadvantages of the digital ramp adc, with the added drawback of calibration drift.
They must be axially aligned with the first segment. The double dual slope multiplier is a multiplying analogtodigital converter based on the dual slope integrating converter. Include the key concept of slope as rate of change. Complete the proof to show that abcd is a parallelogram. Using the dual slope ad converter function in the ht46r7xd1 rev. Ss adc is presented that uses an ultralowpower reference current to achieve scription.
Ccjrootv8n5 pdf group 4 general pathology, logic and cytologic techniques free download as pdf file. A dualslope ad converter operates by charging a capacitor from the input voltage during a fixed time, then discharging it to zero. This topic deals with the cartesian grid and linear equations with some analysis of the graph of the line and its relationship to the equation of the line. A fascinating question has always been how can you convert an analog voltage to an equivalent digital word. Precise calibration of dualslope adcs application note. However, it generally has a long conversion time, so. Thetc500a510514 family are precision analog front ends that implement dual slope ad converters having a maximum resolution of 17 bits plus sign. The singleslope analogtodigital converter ssadc is the most commonly used columnlevel adc for highspeed industrial, complementary metaloxide semiconductor cmosbased xray image sensors because of its small chip area the width of a pixel, its simple circuit structure, and its low power consumption. A dual slope adc, on the other hand, averages together all the spikes and dips within the integration period, thus providing an output with greater noise immunity. The key advantage of this architecture over the single slope. This is a decided disadvantage because most real world signals require some smoothing.