REF192ESZ-REEL7

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The REF192ESZ-REEL7 is a precision voltage reference in the PMIC - Voltage Reference family. It integrates a high accuracy, low power CMOS band-gap reference with a 2.5mV initial accuracy and 2µA Low current consumption. Unusually for a band-gap reference, it also features an integrated temperature compensation circuitry, allowing the device to accommodate the differently sized temperature coefficient of various components in the system. This buffered device features excellent performance with outstanding stability and reliability over time, temperature and supply voltage variations. It\'s designed to bring higher levels of system performance, offering superior features with lower operational costs.

Applications

The REF192ESZ-REEL7 is mainly used in industrial and professional applications, such as:

• Industrial process control systems,
• Data acquisition and signal conditioning systems,
• Power supply regulation,
• Automotive,
• Medical equipment,
• Sensors,
• Analog to digital converters,
• Power management integrated circuits (PMICs),
• Test and measurement systems,
• Communication systems,
• Programmable logic controllers (PLCs).

Features

• CMOS band-gap Reference
• 2.5mV initial accuracy
• 2µA Low current consumption
• Low drift over time, temperature and supply voltage variations
• Integrated temperature compensation circuitry
• 50ppm/°C max drift over temperature
• Output voltage trimming for further fine tuning
• Battery backup

Working Principle

The REF192ESZ-REEL7 integrates a band-gap reference circuit based on the principles of a metal oxide semiconductor field effect transistor (MOSFET). This is essentially a voltage-controlled resistor that is used to produce a regulated bias voltage of 2.5V with an initial accuracy of 2.5mV. The internal circuitry consists of a PMOS transistor, NPN bipolar junction transistor and a temperature sensor, all of which are used to generate the reference voltage.

The PMOS transistor acts as a resistor, controlling the voltage across it using its gate voltage. The NPN bipolar junction transistor is also used to control the current passing through the PMOS transistor, as the base voltage affects the voltage across the PMOS transistor. The NPN bipolar junction transistor also serves as a temperature sensor, allowing the device to compensate for variations in the temperature coefficient of the components.

The PMOS transistor and the NPN bipolar junction transistor are combined in the REF192ESZ-REEL7 to form an amplified current source. This current source is carefully designed to produce a voltage of 2.5V with an accuracy of 2.5mV, which is maintained over time, temperature and supply voltage variations. The device also features an output voltage trimming circuitry, allowing any adjustments to be made to the reference voltage.

The REF192ESZ-REEL7 also features a battery backup, ensuring that the reference voltage is maintained even when the power source is disconnected. This is especially useful in applications where the reference voltage must be maintained in case of a power outage.

Conclusion

The REF192ESZ-REEL7 is a precision voltage reference in the PMIC - Voltage Reference family. It integrates a CMOS band-gap reference with a 2.5mV initial accuracy and 2µA Low current consumption, along with temperature compensation circuitry and output voltage trimming for further fine tuning. Used in industrial and professional applications, it offers superior features with lower operational costs and reliable performance over time, temperature and supply voltage variations.

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