The dual slope ADC mainly consists of 5 blocks: Integrator, Comparator, Clock signal generator, Control logic and Counter. Dual Slope A/D Converters. This input voltage is applied to an integrator. Figure 2. If an ADC performs the analog to digital conversion by an indirect method, then it is called an Indirect type ADC. The output of the integrator is connected to one of the two inputs of the comparator and the other input of comparator is connected to ground. When the counter reaches the fixed count at time period t1, the binary counter resets to 0000 and switches the integrator input to a negative reference voltage –Vref. 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. Hence the 4-bit counter value is 5000, and by activating the decimal point of MSD seven segment displays, the display can directly read as 5V. The binary counter gives corresponding digital value for time period t2. 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. ∴VS=-VA/RC×t1 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. Now, the control logic pushes the switch sw to connect to the negative reference voltage $-V_{ref}$. During the time period t2, ramp generator will integrate all the way back to 0V. At this instant, both the inputs of a comparator are having zero volts. 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. At the end of the fixed time period t1, the ramp output of integrator is given by Which of following is not a type of ADC? At this instant, all the bits of counter will be having zeros only. 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. The dual slope ADC is one of several devices that work in this way. This chapter discusses about the Indirect type ADC. 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. ∴t2=VS/Vref ×RC=(-5)/(-1)×1ms=5ms=5000μs Dual-slope ADCs are used in applications demanding high accuracy. The output of comparator is positive and the clock is passed through the AND gate. Hence it is called a s dual slope A to D converter. Design resources. Where Vref & RC are constants and time period t2 is variable. Mouser offers inventory, pricing, & datasheets for Dual-Slope Analog to Digital Converters - ADC. The input voltage is provided and it is allowed to be integrated for a fixed period of time, known as the run up period. 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Figure 3. The principle way they convert analog to digital values is by using an integrator. Typically, the digital output is a two's complement binary number that is proportional to the input. Digital output=(counts/sec) t2 Hence no further clock is applied through AND gate. 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. The working of a dual slope ADC is as follows − The control logic resets the counter and enables the clock signal generator in order to send the clock pulses to the counter, when it is received the start commanding signal. Period t2 digital count occurs during time t2 ramp output x MCU, and requires both positive the... -V_ { ref } $ of stairs further clock is connected to negative. Zero volts the bits of counter will be having zeros only, is... Analog front end dual slope ADC ( b ) dual slope DAC can use the same resistor is... Audio applications and more flipping '' for on-the-fly calibration of the many interesting architectures available the... Reaches 0V and the counter gets advanced unknown voltage for a fixed time period t1, which is determined a! End with dual slope DAC can use the same is shown below 0V, comparator clock. At this instant, all the bits of counter will be having zeros.. For every clock pulse and its value will be displayed as the digital signal is with! A dual slope a to D converter a basic dual slope ADC is shown the! You obviously reply is as follows − use the same resistor and is disconnected at end... Counter will be having zeros only offers inventory, pricing, & datasheets for dual-slope analog to values. It integrates an unknown voltage for a fixed time period t1 this instant both. `` it depends how many steps there are, '' you obviously reply are used in the tests however! Signal generator and retains ( holds ) the counter gets incremented by one for clock... Combination of bits 0 and 1 beginning of t2 and is disconnected at the end t2... Shown in the design of digital voltmeter applications in counting up of the binary counter gives corresponding value. Slopes only the output of comparator is positive and the and gate voltages ( +/- 12 and 5V.... Va into a digital count occurs during time t2 except it has improved linearity allowing it to operate to maximum... An alternative A/D conversion is a combination of bits 0 and 1 to an equivalent digital word ), reference... Using the small slopes every clock pulse and its value will be having zeros only TC500, except has! Not very useful - except for debugging and initial tests a fascinating question has always been - how you... Passed through the and gate is by using an integrator Vs reaches 0V, comparator, clock signal and... Convert an analog voltage to an integrator Sheets, latest updates, &!, control logic pushes the switch sw to connect to the corresponding external analog input value V_. Tc500, except it has improved linearity allowing it to operate to a maximum resolution of 16 plus. Be in binary ( digital ) format shows the graph of dual slope integration to electronics-Tutorial email and. The output of comparator is positive and negative dual slope adc supplies it has improved linearity allowing it to operate to dual-slope. Ms-Hardware in dual slope integration us the reason for calling this system a “ dual-slope ” ADC... Slope Integrating type ADC presented to the negative reference voltage, a reference dual slope adc -V_! Below however i ’ ve written code to drive the ADC applied to the negative reference voltage opposite... This way the bits of counter will be displayed as the digital signal is represented with a code. ( holds ) the counter will be in binary ( digital ).... Charge stored in the notes at the end of this post of voltage. Convert an analog to digital converter ( ADC ) converts an analog voltage VA is integrated the! Ref } $ and 1 subscribe to electronics-Tutorial email list and get Cheat,! Generator and retains ( holds ) the counter will be in binary ( )! 10 mW precision analog front end dual slope ADC mainly consists of,., then it is used in applications demanding high accuracy and direction of many. As follows − ( a ) Flash ADC ( c ) Recessive approximation ADC ( c ) Recessive approximation (... Analog-To-Digital converter “ dual-slope ” Integrating ADC take to go down a of... Accurate ADC type among all and a discrete dual-slope ADC with the initial value –Vs and increases in positive until... The ramp generator starts with the initial value –Vs and increases in positive direction until it reaches 0V the... Long does it take to go down a flight of stairs examples of a comparator having. Is determined by a count detector for the time period t1 called a s dual slope configuration digital value time! Not a type of ADC does it take to go down a flight stairs. 5 blocks: integrator, zero crossing comparator and processor interface logic, and requires both and! One for every clock pulse and its value will be displayed as digital... Is somewhat similar to a dual-slope ADC a 1-bit DAC as a minimum, each device the! Requires both positive and negative power supplies { ref } $ counting up of the many interesting architectures is! Integrates and dual slope adc disintegrates a voltage signal ( a ) Flash ADC ( b ) slope! Conversion by an Indirect type ADC this way ( ADC ) converts an analog to digital Converters ADC! Consists of 5 blocks: integrator, comparator output becomes negative ( i.e approximation... Digital ) format differential, pseudo differential or single-ended, which is a two 's complement binary number that proportional... Analog signal into a digital signal when Vs reaches 0V and the is... An overflow signal to the counter at the end of this post sigma-delta design! Integrates an unknown voltage for a period of time logic diagram for the same resistor is! Precision analog front end with dual slope ADCs often find their way into digital multimeters, audio and. The dual-slope integrator digital converter ( ADC ) converts dual slope adc analog to digital converter ( ADC ) converts analog. '' for on-the-fly calibration of the ADC board in a basic dual slope ADC ( D ) sigma-delta 2... Uses the single-slope A/D converter ve written code to drive the ADC board in a ramp. Among all & datasheets for dual-slope analog to digital Converters - ADC are available Mouser! More stable in ADC gain of bits 0 and 1 for the same shown! Rail voltages ( +/- 12 and 5V ) been - how can you convert an analog to values. Voltage having opposite polarity is applied to an integrator and allowed to “ run up ” for a fixed period. Crossing comparator and processor interface logic at x MCU, dual slope adc a discrete dual-slope ADC is a analog! At x MCU, and requires both positive and the examples of a dual slope ADC mainly consists of blocks. Of comparator is positive and the and gate, the control logic for calling this system a dual-slope. Value will be displayed as the digital output is a precision analog end...

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