ADR443ARMZ

Overview

The ADR443ARMZ is a precision voltage reference from Analog Devices, utilizing XFET technology to deliver ultralow noise and high accuracy. It provides a fixed 3.0 V output with an initial accuracy of ±0.13% (A grade) or ±0.04% (B grade). The device operates over an extended temperature range of -40°C to +125°C with a low temperature coefficient of 10 ppm/°C (A grade) or 3 ppm/°C (B grade). It features low dropout operation requiring only 500 mV headroom, supports input voltages up to 18 V, and offers current sourcing capability of 10 mA and sinking capability of 5 mA.

Feature Summary

• XFET technology minimizes voltage change vs. temperature nonlinearity for superior stability
• Ultralow noise performance in the 0.1 Hz to 10 Hz frequency band
• Low dropout operation allowing functionality with minimal supply voltage headroom
• Integrated trim terminal enables output voltage adjustment without compromising performance

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 accuracy and temperature coefficients differ between grades. Confirm the package suffix matches the desired footprint; 'ARMZ' indicates an 8-lead MSOP package. Ensure input voltage requirements align with the minimum headroom specifications provided in the datasheet for stable operation across the full load range.

Selection Notes

Select the ADR443ARMZ when a precise 3.0 V reference is needed with minimal noise impact on sensitive analog circuits. Consider the B grade if tighter initial accuracy and lower temperature drift are critical. Evaluate the thermal resistance characteristics if operating near maximum power dissipation limits. Verify that the available supply voltage allows for the required 500 mV headroom under all load conditions.

Part Context

This component belongs to the ADR44x series of XFET voltage references, which includes models with outputs ranging from 2.048 V to 5.0 V. The series shares common architectural features such as patented temperature drift curvature correction and low quiescent current consumption. It is designed to replace traditional buried Zener references in applications demanding higher precision and lower noise levels.

Replacement Considerations

ADR443BRZ is a direct pin-compatible alternative offering the same 3.0 V output but housed in an 8-SOIC package instead of MSOP.