ADR440ARMZ

Overview

The ADR440ARMZ is an ultralow noise, LDO XFET voltage reference with a fixed output of 2.048 V and ±0.15% initial accuracy. It operates within a supply range of 3 V to 18 V, requiring only 500 mV of headroom. The device provides a quiescent current of 3.75 mA, sourcing up to 10 mA and sinking up to -5 mA. Noise performance is rated at 1 µV p-p from 0.1 Hz to 10 Hz. It features a trim terminal for voltage adjustment over a 0.5% range and operates across the extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Utilizes XFET technology to achieve exceptionally low noise and minimal thermal hysteresis compared to traditional bandgap references.
• Features a dedicated TRIM pin that allows users to adjust the output voltage over a 0.5% range without compromising overall performance.
• Supports both sourcing (+10 mA) and sinking (-5 mA) load currents while maintaining stable operation with a minimum 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 'ARMZ' corresponds to the 8-lead MSOP package configuration as documented in the official datasheet. Confirm that the component grade matches the required initial accuracy specifications for your application. Ensure proper handling procedures are followed due to the sensitivity of the internal XFET junction FET structures during installation.

Selection Notes

Select this component when ultralow noise performance below 2 µV p-p is critical for signal integrity. The 2.048 V output level is specifically suited for driving high-resolution analog-to-digital converters. Consider the 500 mV dropout characteristic for applications where supply voltage margins are tight or battery life is a primary constraint.

Part Context

This part belongs to the ADR44x series of XFET voltage references manufactured by Analog Devices. The family includes variants with different fixed output voltages (2.5 V, 3 V, 4.096 V, and 5 V). All members share the same core architecture, offering superior noise and drift characteristics over standard bandgap references while maintaining low power consumption.

Replacement Considerations

Direct functional substitutes within the same family include the ADR441ARMZ (2.5 V), ADR443ARMZ (3.0 V), ADR444ARMZ (4.096 V), and ADR445ARMZ (5.0 V). These parts share identical pinouts, packages, and electrical characteristics aside from the nominal output voltage.