REF5045AID

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PMIC - Voltage Reference: REF5045AID Application Field and Working Principle

A voltage reference is a device that creates and maintains a constant output voltage across all changes in load, input voltage and temperature. The REF5045AID from Texas Instruments is a fully-differential precision voltage reference that provides a wide output range, low temperature drift and high accuracy over temperature. As part of the PMIC (power management integrated circuit) family, the REF5045AID is ideally suited for a variety of precision analog applications including high-precision industrial and automotive measurements.

REF5045AID Applications

The REF5045AID is widely used in various precision measurement applications, such as industrial process control, automotive engine control, medical instruments, as well as in communications and audio-video equipment. It is also widely used in medical equipment, such as EEG monitor and voltage/current sources, because it can provide a stable output voltage for multiplexing or analog-to-digital conversion.

The REF5045AID has a low temperature drift (integral nonlinearity, total harmonic distortion and output noise) and the wide output voltage range (1.2V to 5.5V) makes it suitable for a wide variety of applications. Additionally, its low power consumption and wide operating temperature range (–40°C to 125°C) also make it suitable for portable devices. Furthermore, the REF5045AID provides high noise rejection, so it can be used in noisy environments.

REF5045AID Working Principle

The REF5045AID operates on the principle of zener diode regulation. It works by utilizing a zener diode at the input of the device to regulate the incoming voltage and a adjustable current source to control the output voltage. The adjustable current source is fed back to the zener diode’s input, where it acts as a stabilizer and provides the constant output voltage. The REF5045AID’s voltage reference is further stabilized by a temperature-compensated bandgap circuit that regulates the output voltage.

In addition to the voltage reference, the REF5045AID also consists of an internal voltage divider that provides accurate voltage level sensing over temperature and an adjustable resistor array that can be used to calibrate the output voltage. The adjustable resistor array also allows the user to configure the output voltage over the range of 1.2V to 5.5V.

Conclusion

The REF5045AID is a precision voltage reference device that is well-suited for a variety of applications including industrial process control, automotive engine control, medical instruments, as well as in communications and audio-video equipment. This PMIC (power management integrated circuit) utilizes a zener diode at the input and an adjustable current source at the output, together with a temperature-compensated bandgap circuit for stabilization, to provide a wide output voltage range, low temperature drift and high accuracy over temperature.

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