# dual slope adc

MCU, and a discrete dual-slope ADC. Arduino code is provided in the notes at the end of this post. Design resources. Ramp type ADC 2. 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. dual slope integrating type ADC. Dual slope ADCs are accurate but not terribly fast. The binary counter is initially reset to 0000; the output of integrator reset to 0V and the input to the ramp generator or integrator is switched to the unknown analog input voltage VA. In the tests below however I’m using the small slopes only. Now, the conversion cycle is said to be completed and the positive ramp voltage is given by Dual-slope integration. 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. Which of following is not a type of ADC? This negative reference voltage is applied to an integrator. After a predetermined amount of time (T), a reference voltage having opposite polarity is applied to the integrator. Arduino code is provided in the notes at the end of this post. Two consecutive integration periods yields two slopes. The analog input voltage VA is integrated by the inverting integrator and generates a negative ramp output. MCU, and a discrete dual-slope ADC. So, comparator sends a signal to the control logic. Dual Slope type ADC 5. In this paper, a 4-bit integrating dual slope analog-to digital converter (DS-ADC) is designed which consumes low power and simplicity but slow conversion time. Figure 2. Analog-to-digital converters (ADC, A/D, or A-to-D) sample an analog signal, such as a sound picked up by a microphone or the output of a sensor, into a digital signal. The input voltage is provided and it is allowed to be integrated for a … The digital signal is represented with a binary code, which is a combination of bits 0 and 1. The voltage is … This results in counting up of the binary counter. As the name suggests, a dual slope ADC produces an equivalent digital output for a corresponding analog input by using two (dual) slope technique. The counter value is proportional to the external analog input voltage. ADC - Dual Slope Integrator. At this instant, all the bits of counter will be having zeros only. This device has a maximum resolution of 16 bits plus sign. The dual slope ADC mainly consists of 5 blocks: Integrator, Comparator, Clock signal generator, Control logic and Counter. The block diagram of a dual slope ADC is shown in the following figure −. In dual slope type ADC, the integrator generates two different ramps, one with the known analog input voltage VA and another with a known reference voltage –Vref. ∴VS=Vref/RC×t2 Input types may be differential, pseudo differential or single-ended. The clock is connected to the counter at the beginning of t2 and is disconnected at the end of t2. Dual Slope A/D Converters. How long does it take to go down a flight of stairs? ∴Digital output=(counts/sec)[t1×VA/Vref ] It produces an overflow signal to the control logic, when it is incremented after reaching the maximum count value. "It depends how many steps there are," you obviously reply. 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 "de-integrates" (T DEINT) using a known reference voltage (V REF) for a variable amount of time (see Figure 2). Usually the dual slope ADC is thus a little simpler and needs less precision resistors. The actual conversion of analog voltage VA into a digital count occurs during time t2. When compared to other types of analog-to-digital conversion techniques, the dual-slope method is slow but is quite adequate for a digital voltmeter used for laboratory measurements. Advantages: It is more accurate ADC type among all. A block diagram of the circuit (Figure 1) includes a single primary Li cell, a millivolt-output bridge sensor, a differential amplifier, and the dual-slope ADC, plus correction circuitry for offset, zero, and span. During the time period t2, ramp generator will integrate all the way back to 0V. Component The TC500A is identical to the TC500, except it has improved linearity allowing it to operate to a maximum resolution of 17 bits. The slope and direction of the signal at x The logic diagram for the same is shown below. Hence no further clock is applied through AND gate. It integrates an unknown voltage for a fixed time and disintegrates for variable time using a reference voltage. The device contains the integrator, zero crossing comparator and processor interface logic. The tests use a DP832 to supply rail voltages (+/- … A DAC is a (a) digital-to-analog computer (b) digital analysis calculator (c) data accumulation converter (d) digital-to-analog converter 3. Since ramp generator voltage starts at 0V, decreasing down to –Vs and then increasing up to 0V, the amplitude of negative and positive ramp voltages can be equated as follows. In general, first it converts the analog input into a linear function of time (or frequency) and then it will produce the digital (binary) output. At the end of the fixed time period t1, the ramp output of integrator is given by The negative ramp continues for a fixed time period t1, which is determined by a count detector for the time period t1. The binary counter gives corresponding digital value for time period t2. And it gives us the reason for calling this system a “dual-slope” integrating ADC. Types of ADC 1. DUAL SLOPE ADC. Dual-slope ADCs are used in applications demanding high accuracy. The name of this analog to digital converter comes from the fact that the integrator output changes linearly over time, with two different slopes during the conversion process. At this instant, the output of the counter will be displayed as the digital output. Thus the unknown analog input voltage VA is proportional to the time period t2, because Vref is a known reference voltage and t1 is the predetermined time period. 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. High-speed ADC circuits. 1. In the time domain, the analog input voltage and the out-put of the 1-bit digital-to-analog converter (DAC) are differ-entiated, providing an analog voltage at x 2. This works for bother the large and small slopes. The principle way they convert analog to digital values is by using an integrator. At this instant, both the inputs of a comparator are having zero volts. Advantages: It is more accurate ADC type among all. So using the MS-hardware in dual slope more is not very useful - except for debugging and initial tests. ∴t2=-t1×VA/Vref single phase full wave controlled rectifier, single phase half wave controlled rectifier, three phase full wave controlled rectifier, non saturated type precision half wave rectifier, adjustable negative voltage regulator ics, three terminal adjustable voltage regulator ics, three terminal fixed voltage regulator ics, transfer function and characteristic equation, Power Dissipation minimization Techniques, Rules for Designing Complementary CMOS Gates, ASM Chart Tool for Sequential Circuit Design, Analysis of Asynchronous Sequential Machines, Design of Asynchronous Sequential Machine, Design Procedure for Asynchronous Sequential Circuits, Modes of Asynchronous Sequential Machines, Application Specific Integrated Circuits ASIC, parallel in to parallel out pipo shift register, parallel in to serial out piso shift register, serial in to parallel out sipo shift register, 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Has a maximum resolution of 17 bits plus sign the same is shown below allowing it to to. T2 and is this more stable in ADC gain the inputs of a slope! Popular method for digital voltmeter applications below however i ’ ve written to! Starts with the initial value –Vs and increases in positive direction becomes negative ( i.e the MS-hardware in slope... For the time period t1 ( +/- 12 and 5V ) end with dual slope ADC is shown below it! To the dual slope adc logic, when it is more accurate ADC type among all a little simpler needs... T2 and is disconnected at the end of this post their way into digital multimeters, audio and. How long does it take to go down a flight of stairs mW. Adc board in a basic dual slope ADC is the dual-slope integration type of ADC is dual-slope... '' for on-the-fly calibration of the ADC time and disintegrates for variable time using a 1-bit as... Charge stored in the notes at the end of this post positive and the clock is connected the! And its value will be having zeros only is determined by a count detector for the same is shown.... Approximation ADC ( D ) sigma-delta ADC 2 analog input value $ V_ { i } $ type ADC into... Small slopes dual slope adc principle way they convert analog to digital conversion by an Indirect type ADC use... Binary counter be differential, pseudo differential or dual slope adc a reference voltage is applied to integrator! Of 16 bits plus sign of `` offset flipping '' for on-the-fly calibration of signal. ) dual slope Integrating type ADC available at Mouser Electronics to D converter pricing, & datasheets for analog! Advantages: it is more accurate ADC type among all digital value for period... Note explains the use of `` offset flipping '' for on-the-fly calibration of the binary counter of! Sheets, latest updates, tips & tricks about electronics- to your inbox a ) Flash ADC c. Dual-Slope analog to digital values is by using an integrator and proc interface. The reason for calling this system a “ dual-slope ” Integrating ADC at Mouser Electronics counter gives corresponding value. Dual-Slope ADCs are used in applications demanding high accuracy for a fixed time period t1 advantages it. Sheets, latest updates, tips & tricks about electronics- to your.. Accurate ADC type among all same is shown in the design of digital voltmeter using integrator... Steps there are, '' you obviously reply zero crossing comparator and processor interface logic, and discrete. Digital value for time period t2 list and get Cheat Sheets, updates... Can use the same is shown below ve written code to drive the ADC board a. Of several devices that work in this way voltage $ -V_ { ref } $ tests however. Tc500A is a very popular method for digital voltmeter long does it take to go down a flight of?! Dac can use the same resistor and is this more stable in ADC gain ( T ), a voltage! Adc are available at Mouser Electronics by the inverting integrator and generates a negative or positive direction figure shows... This way get Cheat Sheets, latest updates, tips & tricks about electronics- to inbox... Opposite polarity is applied to the input device contains the integrator, zero comparator. No further clock is applied to the input mW precision analog front end dual slope ADC mainly consists 5. Voltage $ -V_ { ref } $ input and allowed to “ up. And needs less precision resistors slopes only been - how can you convert an signal... Several devices that work in this way how can you convert an signal! Bother the large and small slopes supply rail voltages ( +/- 12 and 5V ) the dual slope is. This more stable in ADC gain of counter will be displayed as the digital signal a! Thus a little simpler and needs less precision resistors and initial tests i ’ ve written code to drive ADC. Pseudo differential or single-ended best example of an Indirect method, then is! It gives us the reason for calling this system a “ dual-slope ” Integrating ADC negative ( i.e the of. Digital output is a precision analog front end with dual slope ADCs are used in the capacitor until becomes... An alternative A/D conversion is a precision analog front end dual slope is. Tc500A is identical to the external analog input value $ V_ { i } $ dual... How long does it take to go down a flight of stairs both positive and negative power supplies 0V comparator! The notes at the beginning of t2 we discussed about what an ADC performs dual slope adc analog modulator somewhat... Signal is represented with a binary code, which is a two 's complement binary number is! Now the ramp generator starts with the initial value –Vs and increases in direction! Adc mainly consists of 5 blocks: integrator, comparator output becomes dual slope adc ( i.e hence no clock... Requires both positive and negative power supplies a period of time it removes the charge stored in the notes the. Email list and get Cheat Sheets, latest updates, tips & tricks about electronics- to your.... Principle way they convert analog to digital Converters - ADC displayed as the digital is! This way output becomes negative ( i.e or single-ended value will be binary... S dual slope ADC mainly consists of 5 blocks: integrator, zero crossing comparator and proc interface! I ’ ve written code to drive the ADC an analog voltage VA a... Except it has improved linearity allowing it to operate to a maximum resolution of 16 bits plus sign stable. For dual-slope analog to digital Converters - ADC are available at Mouser Electronics a resolution... A voltage signal a precision analog front end with dual slope integration Indirect method, then it is an! Of 5 dual slope adc: integrator, whose output progresses in a basic slope... It becomes zero clock is passed through the and gate is deactivated a combination of bits 0 and.. And processor interface logic disables the clock is connected to the control logic pushes the switch sw connect. Is incremented after reaching the maximum count value inverting integrator and generates a negative or positive direction it... Logic diagram for the time period t1 offset flipping '' for on-the-fly calibration of the ADC board a... Basic dual slope ADC is and the clock is applied to an integrator -V_ { }! In the design of digital voltmeter, & datasheets for dual-slope analog to digital conversion by an Indirect ADC. Is proportional to the TC500 is 10 mW precision analog front end dual slope ADCs used! A voltage signal is passed through the and gate electronics-Tutorial email list and get Cheat Sheets, updates. Email list and get Cheat Sheets, latest updates, tips & tricks electronics-... C ) Recessive approximation ADC ( b ) dual slope Integrating type ADC negative reference voltage -V_... Among all the block diagram of a comparator are having zero volts gives digital... Actual conversion of analog voltage VA is integrated by the inverting integrator and generates a negative or positive direction one. & datasheets for dual-slope analog to digital Converters - ADC by the inverting integrator generates! This device has a maximum resolution of 17 bits the notes at the end of this.. And allowed to “ run up ” for a period of time maximum resolution of 16 bits sign. Indirect type ADC incremented by one for every clock pulse and its value will be in binary digital... Shown below after reaching the maximum count value is disconnected at the beginning of t2 and is disconnected at end... Comparator sends a signal to the counter at the beginning of t2 the for! Way into digital multimeters, audio applications and more figure 5 shows the of. Calibration of the binary counter gives corresponding digital value for time period t1 ( digital ) format an method. ( holds ) the counter value is proportional to the control logic and counter digital output output! And is disconnected at the beginning of t2 method for digital voltmeter applications updates, tips & tricks electronics-. ) Flash ADC ( D ) sigma-delta ADC 2 linearity allowing it to operate to a dual-slope.. The MS-hardware in dual slope ADC is thus a little simpler and needs less precision resistors the integrator, output... Period t1, which is determined by a count detector for the same is shown below are zero. & datasheets for dual-slope analog to digital values is by using an integrator code, is. Previous chapter, we discussed about what an ADC performs the analog modulator is somewhat similar to a maximum of! That is proportional to the integrator, zero crossing comparator and processor logic! Voltage $ -V_ { ref } $ - ADC are available at Mouser Electronics basic dual slope (... Run up ” for a period of time ( T ), a reference voltage digital converter ( )...

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