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You should also be familiar with the term "reference voltage," which is significant. A known voltage, referred to as the Reference voltage, is compared against an unknown voltage during an ADC conversion to determine its value.
What is reference voltage?
An electrical device called a voltage reference produces a fixed voltage in the ideal case regardless of the device's load, changes in the power source, changes in temperature, or the passage of time.
When conditions like source voltage or ambient temperature fluctuate, a voltage reference is a precision device created especially to keep the output voltage constant.
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