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How do voltage references work?
A voltage reference is a precision device specifically designed to maintain a constant output voltage, even as parameters such as ambient temperature or supply voltage change. The precision of a voltage reference enables its use in several differ- ent types of applications beyond a data converter.
What are voltage reference circuits?
A voltage reference is an electronic device that ideally produces a fixed (constant) voltage irrespective of the loading on the device, power supply variations, temperature changes, and the passage of time.
What is the reference voltage of an ADC?
ADCs convert analog inputs that can vary from zero volts on up to a maximum voltage level that is called the reference voltage. The reference voltage determines the ceiling of what the ADC can convert, and is essentially the yardstick against which every proportion and result is measured.
What is a precision voltage reference?
The voltage reference is used to produce a precise value of output voltage for setting the full-scale input of the data conversion system. Precision voltage references are available with varying degrees of precision and initial accuracy over some operating temperature range.
What do you need to know about voltage reference?
A voltage reference is simply that—a circuit or circuit element that provides a known potential for as long as the circuit requires it. This may be minutes, hours or years. If a product requires information about the world, such as battery voltage or current, power consumption, signal size or characteristics, or fault identification, then the
Which is the most common voltage reference circuit?
The most common voltage reference circuit used in integrated circuits is the bandgap voltage reference. A bandgap-based reference (commonly just called a ‘bandgap’) uses analog circuits to add a multiple of the voltage difference between two bipolar junctions biased at different current densities to the voltage developed across a diode.
What happens when the reference signal is 5.0 volts?
When the return signal voltage is 5.0 volts, the ECM should have taken into account that the engine is running at idle speed and therefore rationalized that the TPS is either shorted internally or that the reference and signal return wires have shorted together.
Why does a voltage reference have to be drift?
It is therefore often specified as drift/√ kHr. Voltage references tend to age more quickly at higher temperatures. This often-overlooked specification can also be a dominant source of error. It is mechanical in nature, and is the result of changing die stress due to thermal cycling.