LM285DR-1-2 Integrated Circuits (ICs)

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A voltage reference is a circuit used to provide a fixed output voltage regardless of the power supply’s input voltage and load variation. The simplest voltage reference is a Zener diode, which functions as an arbitrary voltage source over a limited range. The LM285DR-1-2 is a precision voltage reference integrated circuit, with a maximum voltage accuracy of 1.2mV. The integrated design of the LM285DR-1-2 provides superior temperature and power supply noise immunity as compared to discrete circuits and provides multiple benefits to the application in which it is used.

Application Areas

The LM285DR-1-2 is used in precision voltage sources, system reference voltage sources, and control circuits for analog and digital set points. The circuit provides a fixed, accurate, and stable voltage output, so it is an ideal choice for applications such as cell phones, laptop computers, and other battery-operated devices that require a reliable reference voltage source. The accuracy of the LM285DR-1-2 makes it also suitable for medical equipment calibration and oscilloscope calibration. Other applications include, but are not limited to, voltage converters, power supplies, motor controllers, and digital-to-analog converters.

Working Principle

The LM285DR-1-2 consists of a precision voltage reference, an adjustable bandgap reference, and an adjustable current source. The precise voltage reference is the core of the device. The adjustable bandgap reference is used to compensate for temperature variations, while the adjustable current source provides an output voltage accuracy of 1.2 mV over a range of 0-215mV, with the reference voltage adjustable to any specific value between 0-215mV. The adjustable current source can also be used to extend the voltage range over a limited range.

The voltage reference can be applied either as a series (regulated) reference or as a shunt (adjustable) reference. As a series reference, a resistor is connected between the reference input and the reference output to provide a constant voltage drop across the load. The shunt reference is used for applications such as adjustable voltage divider circuits.

Conclusion

The LM285DR-1-2 is an ideal choice for applications that require a reliable, precise and adjustable voltage reference. Its integrated design provides superior temperature and power supply noise immunity, as well as a voltage accuracy of 1.2mV. The device is suitable for a wide range of applications, from medical equipment calibration and oscilloscope calibration to voltage conversion and motor control. Using the device, engineers can be assured of accurate operation and better performance.

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