ADR441ARMZ

Overview

The ADR441ARMZ is a precision series voltage reference from Analog Devices, utilizing XFET technology to deliver ultralow noise and high accuracy. It provides a fixed output of 2.5 V with an initial accuracy of ±0.12% (A Grade) or ±0.04% (B Grade). The device features a temperature coefficient of 10 ppm/°C (A Grade) or 3 ppm/°C (B Grade) over the -40°C to +125°C range. It operates with a low dropout headroom of 500 mV, sourcing up to 10 mA and sinking up to -5 mA. Quiescent current is typically 3.75 mA.

Feature Summary

• XFET technology minimizes voltage change nonlinearity versus temperature for superior stability.
• Ultralow noise performance in the 0.1 Hz to 10 Hz frequency band.
• Capable of sourcing 10 mA and sinking 5 mA output current.
• Includes a TRIM pin for adjusting output voltage within a 0.5% range.

Applications

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

Procurement Notes

Verify the specific grade suffix (e.g., ARMZ vs ARMZ) against the datasheet ordering guide to confirm the required initial accuracy and temperature coefficient specifications. Ensure the package type matches the design footprint requirements. Confirm RoHS compliance status as indicated in the manufacturer documentation before finalizing procurement.

Selection Notes

Select this component when low noise and high precision are critical for signal integrity. The choice between A Grade and B Grade depends on the strictness of the initial accuracy and temperature drift requirements. Verify that the input voltage allows for the minimum 500 mV dropout headroom relative to the 2.5 V output under all operating load conditions.

Part Context

This part belongs to the ADR44x family of XFET voltage references, which includes models with outputs ranging from 2.048 V to 5.0 V. The family shares common architectural features such as low dropout operation and trim capabilities. The ADR441 specifically targets applications requiring a standard 2.5 V reference level with enhanced noise performance compared to traditional bandgap references.

Replacement Considerations

ADR441ARZ is the SOIC-8 package equivalent. ADR441ARM is the MSOP-8 package without RoHS compliance. Other family members like ADR440, ADR443, ADR444, and ADR445 offer different fixed voltages but share similar electrical characteristics and pinouts.