Shunt voltage reference

When designing a shunt voltage reference for applications ranging from automobiles to simple temperature measurements, interfacing with the analog world typically requ When designing a system for applications ranging from automobiles to simple temperature measurements, interfacing with the analog world typically requires data converters digital-to-analog and analog-to-digitalsensors, or other application-specific integrated circuits ICs.

There are two types of voltage references, shunt references and series references. Each type has its own usage conditions and the process of selecting between the two can be intimidating. Comparison tables do exist, but they typically provide little insight on how to choose one reference topology over the other for specific applications. This blog series will discuss the applications of both shunt and series references and when to use them, as well as highlight some lesser known use cases for each reference topology. Part 1 - Shunt versus series: Which topology is right for you? The real world is analog for now at least , and the most common way to interface with the real world is to use analog-to-digital converters ADCs , sensors or other application-specific integrated circuits ICs. A voltage-reference IC provides a stable output voltage that can be used as a constant value as system voltage and temperature change.

Shunt voltage reference

You can also set the cathode current using the various resistors in series with the supply. This external resistor quick-start calculator tool lets you easily calculate valid external resistor values relative to voltage reference, supply and load-current bounds. With these inputs, you can instantly view the resulting calculations and use the color-coded indications to understand Use our reference design selection tool to find designs that best match your application and parameters. Minimize idle power consumption with low-quiescent current I Q shunt voltage references. Low idle power consumption in the power supply can help you design Energy Star-rated appliances and small but reliable power adapters. Our low-I Q shunt voltage references can help your power-supply designs achieve low standby power and longer battery run times, while lowering system costs. Minimize power consumption and extend battery life with our high-accuracy shunt references. Some power supplies, such as those used in servers and industrial instruments, accuracy and stability requirements demand more precise voltage references that can keep the output accurate across changes in input voltage, output load and operating temperature. Our portfolio of high-accuracy, low-temperature coefficient shunt voltage references help enable a more efficient power supply. In hybrid, electric and powertrain systems, shunt voltage references ensure feedback loop control and accuracy in system diagnostics. Our shunt voltage references are available in a range of voltage options and package sizes to meet your system requirements without draining power. Available in multiple output and accuracy options to suit your design's needs, our shunt voltage references offer accurate and cost-effective power-management solutions. The wide range of package, voltage and accuracy options of our precision shunt voltage references enable reliable power-supply designs.

The first loading condition is when the input voltage is at its minimum and the load current is at its maximum.

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In part two of our Understanding Voltage References series, my colleague Christopher Dean talked about ultra-low dropout and how it is not just for the series reference. It is similar in concept to a linear voltage regulator LDO but designed for a lower quiescent current and much higher accuracy. It regulates the output voltage by adjusting its internal resistance such that VIN minus the drop across the resistance, R, equals the reference voltage at VOUT; see the block diagram in Figure 1. The series references generally have much better initial accuracy and temperature drift coefficient than do shunt references. Thus, if you need better than 0. However, the shunt references offer more flexibility in terms of V IN range, as well as the option to stack multiple devices on top of one another to obtain higher reference voltages and the ability to create negative or floating references. How can you combine the shunt reference design flexibility with series reference precision? By doing so the series voltage references in this family are essentially converted into Zener diodes but with greatly diminished negative effects of shot noise and reverse-breakdown resistance. Figure 2: Simplified schematic of the REF

Shunt voltage reference

When designing a system for applications ranging from automobiles to simple temperature measurements, interfacing with the analog world typically requ When designing a system for applications ranging from automobiles to simple temperature measurements, interfacing with the analog world typically requires data converters digital-to-analog and analog-to-digital , sensors, or other application-specific integrated circuits ICs. Accurate measurements require a reference voltage that does not fluctuate with system conditions such as input voltage or ambient temperature. A voltage-reference IC provides the steady voltage other ICs use to make measurements with the required accuracy. There are two types of voltage references: shunt references and series references. Selecting a reference topology for a given application can feel overwhelming.

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With these inputs, you can instantly view the resulting calculations and use the color-coded indications to understand Discover featured applications Hybrid, electric and powertrain systems. When selecting a voltage reference for your next application, be sure to keep the typical use cases below in mind. Voltage reference product overview 3. A voltage-reference IC provides the steady voltage other ICs use to make measurements with the required accuracy. The external resistor, R S , is required for regulation, but there is no maximum input-voltage rating for a shunt reference. Achieve high-accuracy voltage regulation in grid applications with shunt voltage references. Application brief. Shunt voltage references Low I Q and high precision for your power and signal chain applications parametric-filter View all products. Similar topics.

There are two types of voltage references, shunt references and series references. Each type has its own usage conditions and the process of selecting between the two can be intimidating. Comparison tables do exist, but they typically provide little insight on how to choose one reference topology over the other for specific applications.

To approximate battery life, divide the total capacity of the battery in milliamp-hours by the average load on the battery. In this example, R S can be any value between 3. A voltage-reference IC provides the steady voltage other ICs use to make measurements with the required accuracy. It only consumes as much current as required by the load, plus a small quiescent current. Shunt voltage references. Shunt references are flexible because they can create a floating reference voltage not referenced to ground as well as negative references. Several factors can affect battery life, but this simple example shows the difference in power consumption between series and shunt voltage-reference operation. Using our shunt voltage reference device for example, the supply current is fixed and does not change with the demand of the load, since excess current is shunted to ground through the reference. A shunt reference is a good choice when the load current is known to remain fairly stable and the system has a wide-input voltage range. View reference designs. Learn how shunt voltage references can help you successfully use voltage supervisors in high-voltage applications.