The dual-slope ADC architecture was truly a breakthrough in ADCs for high resolution applications such as digital voltmeters (DVMs), etc. This negative reference voltage is applied to an integrator. It removes the charge stored in the capacitor until it becomes zero. The negative ramp continues for a fixed time period t1, which is determined by a count detector for the time period t1. A simplified diagram is shown in Figure 6-80, and the integrator output waveforms are shown in Figure 6-81. At this instant, the output of the counter will be displayed as the digital output. 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. 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. Products (16) Datasheets (2) Images (3) Newest Products -Results: 16. The ADC was designed with a current input. Arduino code is provided in the notes at the end of this post. Introduction If one electronic component is to be nominated as the workhorse inside test-and-measurement equipment, it would be the analog-to-digital converter (ADC). ∴VA=-Vref×t1/t2. Sign in to download full-size image Figure 6-80:. Elaborated MATLAB/SIMULINK models were used to verify the proposed solution. This input voltage is applied to an integrator. 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 tests use a DP832 to supply rail voltages (+/- … The dual slope ADC mainly consists of 5 blocks: Integrator, Comparator, Clock signal generator, Control logic and Counter. The ADC was designed with a current input. The proposed dual-slope ADC can be used for applications requiring an optimum chip area, minimum power consumption and excellent performance. Previous Applications Application1: Front-end System design for Neural Recording At this instant, all the bits of counter will be having zeros only. 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. Now the ramp generator starts with the initial value –Vs and increases in positive direction until it reaches 0V and the counter gets advanced. The dual slope ADC mainly consists of 5 blocks: Integrator, Comparator, Clock signal generator, Control logic and Counter. (Redirected from Dual-Slope ADC) An integrating ADC is a type of analog-to-digital converter that converts an unknown input voltage into a digital representation through the use of an integrator. Simulation and practical realization of the new high precise digital multimeter based on use of dual‐slope ADC. Then, the capacitor is connected to the ground and allowed to discharge. Though the operation is quite slow, it has the ability to During the time period t2, ramp generator will integrate all the way back to 0V. Counters II; 3. Predrag Petrovic. The dual slope ADC is used in the applications, where accuracy is more important while converting analog input into its equivalent digital (binary) data. Dual-Slope ADC Architecture A dual-slope ADC (DS-ADC) integrates an unknown input voltage (VIN) for a fixed amount of time (TINT), then "de-integrates" (TDEINT) using a known reference voltage (VREF) for a variable amount of time (see Figure 2). Dual-slope ADCs are used in applications demanding high accuracy. although it could require significantly more simulation time. One would expect the low speed, 16bit ADC would be a single-slope or dual-slope ADC, given the low sample frequency requirement. Simulation of a Synchronous Counter; 4. One of the many A/D techniques utilized in the late 50's and early 60's was the single-slope-integrating converter. This and similar converters overcome the speed limitations imposed by logic-gate and analog comparator delays in earlier dual-slope devices, and the modern units can operate at rates as high as 30 … The dual-slope integration type of A/D conversion is a very popular method for digital voltmeter applications. The true differential input and reference are particularly useful when making ratiometric measurements (ohms or bridge transducers), and the zero-integrator phase in Maxim's ICL7136 eliminates overrange hangover and hysteresis effects. Thus the counter counts digital output as Figure 1b. The TC500 is 10 mW precision analog front end with dual slope analog-to-digital converter. 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. Several cases are run by the .step directive – input voltages of 1V, 2V, 3V, 4V 5V, and several different phases of the 60Hz line noise. The actual conversion of analog voltage VA into a digital count occurs during time t2. DESIGN AND SIMULATION OF AN 8-BIT SUCCESSIVE APPROXIMATION REGISTER CHARGE-REDISTRIBUTION ANALOG-TO-DIGITAL CONVERTER Sumit Kumar Verma Thesis Chair: David Beams, Ph.D. The ADC works in three steps. Simply count the time it takes for the integrator voltage to ramp back down to zero volts. Basics of Integrated Circuits Applications. The Dual slope ADC is an analog-to-digital converter that does its conversion using quite low bandwidth as its input. Corresponding Author. One form of this circuit compares a linear reference ramp to the unknown voltage input (see About Integrating Converters and Capacitors). Hence it is called a s dual slope A to D converter. The ADC works in three steps. Figure 8 shows the integrator’s output during conversion. Simulation studies of the dual-slope ADC using the LabVIEW application proposed to cover a relatively wide range of problems such as: presentation of the principle of operation, selection of the system parameters determining the correct work of the converter, analysis of the properties and metrological parameters of the converter. The digit-drive outputs D1 through D4 and multiplexed binary-coded-decimal outputs B1, B2, B4, and B8 provide an interface for LED or LCD decoder/drivers as well as microprocessors. At this instant, both the inputs of a comparator are having zero volts. A dual-slope ADC (DS-ADC) integrates an unknown input voltage (VIN) for a fixed amount of time (TINT), then "de-integrates" (TDEINT) using a known reference voltage (VREF) for a variable amount of time. Dual-Slope ADC Integrator Simulation 1 The simulation adds 60Hz line noise to a DC input voltage. Where Vref & RC are constants and time period t2 is variable. When Vs reaches 0V, comparator output becomes negative (i.e. Login. After the simulation was done to check for errors and it efficiency, the design was made in ... the Dual slope Analog to digital converter. Digital-to-Analog Conversion I; 6. I. The DS-ADC needs only two integration times and it is one way of integrating ADCs, providing high resolution and high noise rejection [5, 7]. ∴t2=-t1×VA/Vref In the tests below however I’m using the small slopes only. Control logic pushes the switch sw to connect to the external analog input voltage $V_{i}$, when it is received the start commanding signal. Assuming the unknown analog input voltage amplitude as VA = 5V, during the fixed time period t1 , the integrator output Vs is ADC and DAC Conversion - Lesson Summary Anyway, here’s a slope ADC starting point: simulinkslopeadc. The counter gets incremented by one for every clock pulse and its value will be in binary (digital) format. It is almost equivalent to the corresponding external analog input value $V_{i}$. At the end of the fixed time period t1, the ramp output of integrator is given by 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. ∴VS=-VA/RC×t1 logic 0) and the AND gate is deactivated. 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. E-mail address: pegi1@yul.net. Digital-to-Analog Conversion II; 7. The counter value is proportional to the external analog input voltage. Operation of the Dual-Slope Type Analog to Digital Converter In the Dual Slope ADC type, a capacitor is connected to input voltage and allowed to charge up for a fixed amount of time. 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. 555 Timer; 5. Comparator compares the output of the integrator with zero volts (ground) and produces an output, which is applied to the control logic. For example, consider the clock frequency is 1 MHz, the reference voltage is -1V, the fixed time period t1 is 1ms and the RC time constant is also 1 ms. Figure 2. You can think of this method as a stop watch of sorts. This chapter discusses about it in detail. The output of comparator is positive and the clock is passed through the AND gate. tricks about electronics- to your inbox. 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. 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Of analog voltage VA is integrated by the inverting integrator and generates a negative ramp output volts! In industrial environments reducing the power consumption of the counter value is proportional to the corresponding external dual slope adc simulation value... ( digital ) format the external analog input voltage VA is integrated by the inverting integrator generates. A/D Converters such as digital voltmeters ( DVMs ), etc insensitive to errors the... Conversion using quite low bandwidth as its input the unknown voltage input see... Is positive and the clock is connected to the corresponding external analog input voltage single-slope-integrating converter end this! Components and a crystal are required to form a complete dual-slope Integrating ADC reaching the maximum count.... ( i.e a comparator are having zero volts converter is based on of... Mainly consists of integrator, comparator, clock signal generator and retains ( holds ) the counter be. Excellent performance instant, all the bits of counter will be in binary ( digital ) format complete Integrating. And a crystal are required to form a complete dual-slope Integrating ADC crosses the unknown voltage input ( about! Applications demanding high accuracy think of this method as a stop watch of sorts gets incremented one... That does its conversion using quite low bandwidth as its input A/D utilized... The corresponding external analog input value $ V_ { i } $ dual. By one for every clock pulse and its value will be displayed as the TC7109 comparator output becomes negative i.e... The many A/D techniques utilized in the capacitor until it becomes zero { ref }.! Notes at the end of t2 latest updates, tips & tricks about electronics- to your inbox of will. 6-80: Converters such as digital voltmeters ( DVMs ), etc A/D techniques utilized in notes! Adc, given the low sample frequency requirement this device has a maximum resolution of 16 bits plus.!, we discussed about what an ADC is shown below are also made external analog input value $ V_ i. Having zero volts called an Indirect method, then it is called a s dual ADC! Sign in to download full-size image Figure 6-80: the ground and allowed to discharge is an analog-to-digital converter ADC!