ADR391BUJZ-R2

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PMIC (Power Management Integrated Circuit) is an IC which is used to ensure that the various components of a system receive the correct voltage and current for proper operation. Voltage reference is a core function of PMIC, which is an important part of the power supply system to providing a stable output voltage. ADR391BUJZ-R2 is an industrial grade low noise voltage reference from Analog Devices which can provide a highly accurate and stable reference voltage output in a wide input/output voltage range.

The ADR391BUJ-R2 voltage reference is designed to provide a constant voltage output across varying load conditions. It is designed for low power consumption and can achieve low temperature coefficient, thereby minimizing the effects of external temperature fluctuations. It is also designed to be reverse-current protected, which eliminates the need for external reverse current protection and protection circuitry. Additionally, it is designed to be reverse volt-protected, which eliminates the need for external protection circuitry. The precise output voltage is user-programmable and can be adjusted with an external resistor.

The ADR391BUJZ-R2 operates with a dedicated low voltage power supply that can provide a maximum output voltage of 1.5 V to as low as 0.5 V. The device supports a wide input voltage range from 3 V to 8 V and can provide a low output noise level of 10 μV (max) at 1 kHz. The device also features a low power supply rejection ratio of 0.2% and a low temperature coefficient of 0.05%. The user-programmable output range is 0.5 V to 1.5 V and it can provide an accuracy of 0.25%.

The working principle of the ADR391BUJZ-R2 is to use a high stability voltage reference as the base reference, combined with a closed loop feedback control IC. The voltage reference is connected to the high voltage voltage regulator and the voltage regulator is connected to the output of the voltage reference. The high stability voltage reference is used to provide a stable reference voltage while the differential amplifier inside the control IC is used to compare the output voltage with the reference voltage and adjust the voltage regulator until the output voltage matches the reference voltage. Thus the load will always receive the exact desired voltage for proper operation.

The ADR391BUJZ-R2 voltage reference is particularly suitable for industrial and medical applications, where precise and accurate voltage references are required. It also provides excellent thermal stability and reliability, along with wide input/output voltage range, low power consumption and low output noise, making it ideal for low power and high reliability applications. The user-programmable reference voltage provides flexibility and helps to reduce the time and cost for product design.

In conclusion, the ADR391BUJZ-R2 voltage reference is a low noise, low power and highly accurate device which can provide a stable and precise output voltage. It has a wide input and output voltage range, comes with reverse current protection, is user-programmable, offers low power consumption and low temperature coefficient. It is suitable for industrial, medical and other low power, high precision and high reliability applications.

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