ADR421BRZ

Overview

The ADR421BRZ is a second-generation XFET voltage reference with a fixed output of 2.500 V and B-grade initial accuracy of ±0.04%. It operates within an input range of 4.5 V to 18 V, drawing a maximum quiescent current of 500 µA. The device provides a high output current of 10 mA and maintains low noise of 1.75 µV p-p from 0.1 Hz to 10 Hz. It features a temperature coefficient of 3 ppm/°C and long-term stability of 50 ppm per 1000 hours. Packaged in an 8-lead SOIC, it functions reliably across temperatures from −40°C to +125°C.

Feature Summary

• Utilizes patented eXtra implanted junction FET (XFET) technology for superior thermal hysteresis and low noise compared to band gap references.
• Includes a dedicated trim terminal allowing output voltage adjustment over a ±0.5% range without compromising temperature coefficients.
• Offers high output drive capability of 10 mA while maintaining low supply headroom requirements.

Applications

• Precision data acquisition systems
• High resolution converters
• Optical network control circuits

Procurement Notes

Verify the specific suffix 'BRZ' corresponds to the B-grade electrical specifications and the 8-lead SOIC package configuration. Confirm that the ordering code matches the required initial accuracy and temperature coefficient ratings defined in the manufacturer's datasheet before finalizing procurement.

Selection Notes

Select this component when applications demand ultra-low noise performance combined with high precision. The B-grade specification ensures tighter initial accuracy limits suitable for critical measurement environments. Ensure the system input voltage remains above the minimum operating threshold to maintain regulation.

Part Context

This part belongs to the ADR42x series of ultraprecision voltage references manufactured by Analog Devices. The series utilizes XFET architecture to achieve exceptional stability and low noise characteristics. Other models in the family include different nominal output voltages such as 2.048 V, 3.00 V, and 5.00 V.

Replacement Considerations

ADR421ARZ

FAQ

Can the output voltage be adjusted?

Yes, the TRIM pin allows for output voltage adjustment over a ±0.5% range without affecting the temperature coefficient.

Is an output capacitor required for stability?

No, the device does not require output capacitors for stability under any load condition, though they can be used for noise filtering.