AD780BRZ-REEL

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A PMIC (power management IC) helps to ensure that external circuitry has the correct voltages needed to operate properly. The Texas Instruments AD780BRZ-REEL is a voltage reference IC that provides an accurate reference voltage to circuits and can also measure dc and ac voltages when combined with additional circuitry. This article explains the application field and working principle of the AD780BRZ-REEL.

Application Field

The AD780BRZ-REEL is used to generate an accurate and stable reference voltage for precision analog circuit applications such as data acquisition systems, data conversion, instrumentation, and medical diagnostics equipment. It can also be used to measure the voltage level of an external voltage source, making it a useful addition to many test and measurement applications. Its impressive specifications make it an ideal choice for many applications, as it offers precision accuracy (±1.5mV) and very low noise performance (2.5μVpp).

Working Principle

The AD780BRZ-REEL is based around a band gap reference (BG) circuit. Band gap reference circuits are based on the principle that the differential voltage between two opposite conductivity types (NPN and PNP transistors) is proportional to the absolute temperature. The AD780BRZ-REEL uses a number of components to create its own voltage reference, which is then fed to an op-amp that amplifies the signal to provide an output voltage. In addition, the circuit also contains a voltage buffer and current sources to maximize accuracy and minimize noise.

The BG circuit operates as follows: two transistors (NPN and PNP) are connected to the same current source and their emitters are connected together. This causes the voltages at the base of the two transistors to be equal. As the temperature increases, the voltage of the NPN transistor decreases, and the opposite for the PNP transistor, resulting in a voltage difference between the two transistors that is proportional to the absolute temperature. This voltage is then amplified by the op-amp to create a stable reference voltage.

Conclusion

The Texas Instruments AD780BRZ-REEL is a voltage reference IC that is ideal for applications requiring precision accuracy and very low noise. Its band gap reference circuit allows it to generate its own voltage reference, which is then amplified to the desired voltage output. Its low noise performance and error budgets make this voltage reference suitable for a wide range of applications such as data acquisition and test and measurement.

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