ADR440BRZ-REEL7

Overview

The ADR440BRZ-REEL7 is a series precision voltage reference from the XFET family, 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 3 ppm/°C. The device operates within a supply voltage range of 3 V to 18 V, requiring a minimum headroom of 500 mV. It features ultralow noise performance of 1 µV p-p (0.1 Hz to 10 Hz) and supports sourcing up to 10 mA and sinking up to -5 mA. Quiescent current is typically 3.75 mA across the operating temperature range of -40°C to +125°C.

Feature Summary

• Utilizes XFET technology for superior noise performance compared to buried Zener references
• Features a dedicated trim terminal allowing output voltage adjustment over a 0.5% range
• Capable of high output source and sink currents without compromising stability
• Operates with low dropout voltage requiring only 500 mV supply headroom

Applications

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

Procurement Notes

Verify the specific suffix 'R' indicates the SOIC-8 package configuration when ordering. Confirm that the B grade designation corresponds to the required 3 ppm/°C temperature coefficient and ±0.05% initial accuracy specifications. Ensure the reel packaging format aligns with automated assembly requirements. Cross-reference the manufacturer part number against official distributor catalogs to confirm current availability status.

Selection Notes

Select this component for applications demanding ultralow noise and high accuracy in compact surface-mount designs. The B grade offers tighter tolerance than the A grade variant. Consider the 10 mA sourcing capability for driving moderate loads directly. Verify input voltage constraints relative to the 500 mV dropout requirement. Evaluate thermal resistance characteristics if operating near maximum ambient temperatures.

Part Context

This part belongs to the ADR44x series of XFET voltage references, which includes models with outputs ranging from 2.048 V to 5.000 V. The series shares common architectural features such as low noise generation and trim capabilities. The BRZ suffix specifically denotes the B grade electrical performance and the narrow SOIC-8 package type. This family is designed for high-end signal conversion applications requiring minimal drift.

Replacement Considerations

ADR440ARZ-REEL7: Offers identical functionality but with A grade specifications (±0.15% accuracy, 10 ppm/°C).

FAQ

How does the XFET technology improve noise performance?

XFET technology uses junction field effect transistors with extra channel implants, resulting in significantly lower noise compared to traditional band gap or buried zener references.

What is the purpose 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 without degrading temperature performance.