ADR440BRZ

Overview

The ADR440BRZ is a fixed-output series voltage reference from the XFET family, manufactured by Analog Devices Inc. It provides a nominal output voltage of 2.048 V with an initial accuracy tolerance of ±0.05%. The device operates within an input voltage range of 3 V to 18 V and maintains a low dropout headroom of 500 mV. Key electrical specifications include a temperature coefficient of 3 ppm/°C, a quiescent current of 3.75 mA, and ultralow noise performance of 1 µV p-p in the 0.1 Hz to 10 Hz frequency band. It supports sourcing up to 10 mA and sinking up to -5 mA of load current.

Feature Summary

• Utilizes XFET technology for superior noise performance compared to buried Zener references.
• Features a dedicated TRIM pin allowing output voltage adjustment over a 0.5% range without compromising performance.
• Capable of both sourcing +10 mA and sinking -5 mA output currents.
• Operates with minimal supply voltage headroom of 500 mV.

Applications

• Precision data acquisition systems
• High resolution data converters
• Battery-powered instrumentation
• Portable medical instruments

Procurement Notes

Verify the specific suffix 'BRZ' corresponds to the B-grade electrical specifications (±0.05% accuracy, 3 ppm/°C) and the SOIC-8 package. Confirm that the ordering code matches the manufacturer's official documentation to ensure correct grade selection. Cross-reference the datasheet revision to validate parameter consistency before finalizing procurement orders.

Selection Notes

Select this component when ultralow noise and high precision are required in space-constrained designs. The B-grade specification ensures tight initial accuracy and low temperature drift. Ensure the application input voltage remains above the minimum operating threshold relative to the output voltage plus the 500 mV dropout requirement.

Part Context

This part belongs to the ADR44x series of XFET voltage references, which includes models with various fixed output voltages such as 2.5 V, 3 V, 4.096 V, and 5 V. All members of this family share similar architectural features, including low dropout operation and trim capabilities, but differ in their nominal output voltage and specific noise characteristics.

Replacement Considerations

ADR4530ARZ is listed as a similar substitute option.

FAQ

How does the XFET technology improve performance?

XFET technology minimizes voltage change versus temperature nonlinearity and offers better noise performance than traditional buried Zener references.

What is the function of the TRIM pin?

The TRIM pin allows users to adjust the output voltage over a 0.5% range to compensate for system errors or reference inaccuracies.