ADR420BRZ

Overview

The ADR420BRZ is a second-generation eXtra implanted junction FET (XFET) voltage reference manufactured by Analog Devices Inc. It provides a fixed output voltage of 2.048 V with an initial accuracy of ±0.05% and a temperature coefficient of 1 ppm/°C. The device operates within a supply voltage range of 4 V to 18 V, drawing a maximum quiescent current of 0.5 mA while delivering up to 10 mA of load current. Key electrical specifications include a low noise performance of 1.75 µV p-p from 0.1 Hz to 10 Hz, long-term stability of 50 ppm per 1000 hours, and line regulation of 35 ppm/V. It is housed in an 8-lead SOIC package and functions reliably across an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Utilizes patented XFET technology for superior accuracy and thermal hysteresis compared to band gap references.
• Features a dedicated trim terminal allowing output voltage adjustment over a ±0.5% range without compromising temperature coefficients.
• Offers exceptionally low noise characteristics suitable for precision conversion applications.

Applications

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

Procurement Notes

Verify the specific suffix 'BRZ' corresponds to the B Grade accuracy and SOIC package configuration required for your design. Confirm that the ordering information matches the exact 2.048 V output specification. Ensure compatibility with the 8-lead SOIC footprint during PCB layout. Cross-reference the datasheet revision to validate all electrical parameters against your system requirements before finalizing procurement.

Selection Notes

Select the ADR420BRZ when a precise 2.048 V reference is needed with high accuracy and low drift. The B Grade offers tighter initial accuracy than the A Grade. Consider the XFET architecture benefits regarding low noise and stability. Evaluate the 8-lead SOIC package size constraints. Verify input voltage headroom requirements against the minimum differential voltage specifications provided in the datasheet.

Part Context

The ADR420BRZ belongs to the ADR42x series of ultraprecision voltage references, which also includes models with different nominal output voltages such as 2.500 V, 3.00 V, and 5.00 V. These devices share common architectural features including XFET technology and similar pin configurations. The series is designed to replace older generation references like the REF02, offering improved performance in smaller surface-mount packages.

Replacement Considerations

The datasheet indicates pin-compatible alternatives within the same family, such as the ADR421, ADR423, and ADR425, which provide different fixed output voltages but maintain identical physical footprints and general performance characteristics.

FAQ

Can the output voltage be adjusted?

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

Is an output capacitor required for stability?

No, the ADR42x does not require an output capacitor for stability under any load condition, though one can be added to filter noise.