ADR441ARZ

Overview

The ADR441ARZ is an ultralow noise, low dropout XFET voltage reference with a fixed output of 2.5 V. It features an initial accuracy of ±0.12% and a temperature coefficient of 10 ppm/°C for the A grade. The device operates within a supply voltage range of 3 V to 18 V, requiring only 500 mV of headroom. It provides a source current of +10 mA and a sink current of −5 mA, with a quiescent current of 3.75 mA. Noise performance is specified at 1.2 µV p-p from 0.1 Hz to 10 Hz. The component is housed in an 8-lead SOIC package and functions across a temperature range of −40°C to +125°C.

Feature Summary

• Utilizes XFET technology to minimize voltage change versus temperature nonlinearity.
• Features a dedicated TRIM pin allowing output voltage adjustment over a 0.5% range.
• Capable of sourcing up to 10 mA and sinking up to 5 mA of load current.
• Operates with low supply voltage headroom of 500 mV.

Applications

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

Procurement Notes

Verify the specific electrical grade (A or B) required for your application, as the datasheet distinguishes between them based on temperature coefficient and initial accuracy specifications. Confirm that the 8-lead SOIC package aligns with your PCB footprint requirements. Ensure input voltage conditions meet the minimum operating range relative to the output voltage to maintain proper regulation.

Selection Notes

Select this component when ultralow noise performance is critical for signal integrity in precision measurement applications. Consider the A grade specification if a 10 ppm/°C temperature coefficient meets system requirements. Evaluate the 500 mV dropout characteristic against available supply rails to ensure stable operation under varying load conditions and input voltage fluctuations.

Part Context

The ADR441ARZ belongs to the ADR44x series of XFET voltage references manufactured by Analog Devices. This family includes variants with different fixed output voltages such as 2.048 V, 3.0 V, 4.096 V, and 5.0 V. All members share common architectural features including low noise density, high accuracy, and the ability to drive significant capacitive loads while maintaining stability.

Replacement Considerations

Direct substitutes within the same family include the ADR440ARZ, ADR443ARZ, ADR444ARZ, and ADR445ARZ, provided the fixed output voltage matches the design requirement. Verify that any replacement maintains the required initial accuracy and temperature coefficient grades.