However, there are three basic standard units for measuring the temperature i.e. Temperature is actually measured with different units at different places all across the world.
#Voltage to temperature conversion how to#
Today, I am going to share my knowledge with all of you guys, on how to make a Temperature Conversion in LabVIEW. It only allows us to calculate the maximum error that can occur in a specified temperature range.Hello friends! I hope you all will be absolutely fine. It’s important to note that the tempco specification doesn’t give us any information about the shape of the temperature-induced variations. The common method (definition) for calculating the temperature coefficient is the “Box method”. The temperature coefficient (tempco) of a voltage reference allows us to characterize the temperature-induced errors in the reference output. Voltage references are widely used in data converters, power supplies, measurement and control systems. Review on the Basics of the Tempco of a Voltage Reference For more information, please refer to this application note from Maxim. In this case, we should estimate the die temperature and calculate the drift error based on the die temperature range. The power dissipated in a device can lead to a difference between the die temperature and the ambient temperature. The temperature range used to specify the tempco of a device refers to the die temperature. Many practical voltage references, especially the compensated bandgap devices, have an S-shaped curve (See Figure 5).įigure 5 Image courtesy of Analog Devices. Moreover, note that Figures 3 and 4 depict hypothetical voltage drift characteristics. Therefore, we need to consider the design requirements carefully to avoid overdesigning. The lower the drift, the more costly the product will be. Hence, if a particular application mandates keeping the absolute value below half LSB, we can simply choose a voltage reference that keeps the variation below ¼ LSB. However, depending on the voltage drift characteristics of a given device, the absolute value can be somewhere between V FS - 0.5 LSB to V FS + 0.5 LSB. This case is similar to that depicted in Figure 4.Īs you can see, a tempco of 4.88 ppm/☌ guarantees that the variation is less than half LSB (regardless of the shape of the variations).
The nominal output voltage is 5 V but, as you can see, it’s not 100% independent of temperature.įigure 1. Figure 1 below shows the output of LT1021-5. While the output of a voltage reference should be ideally independent of temperature, a real-world voltage reference exhibits temperature-induced variations in the output. What Is a Temperature Coefficient Specification? This article looks at the temperature coefficient (tempco) specification that characterizes the temperature-induced variations in the output of a voltage reference. There are several specifications that allow us to characterize the various aspects of a voltage reference accuracy. The accuracy of such systems can be directly affected by the accuracy of the employed voltage reference. They are widely used in data converters, power supplies, measurement and control systems. Voltage references produce a stable voltage that’s ideally independent of changes in supply voltage, temperature, load, and other external factors. How does temperature affect the output of a voltage reference? What is a temperature coefficient specification?
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