ADR443BRZ

Overview

The ADR443BRZ is a series voltage reference from Analog Devices Inc., utilizing XFET technology for ultralow noise and high precision. It provides a fixed output of 3.0 V with an initial accuracy of ±1.2 mV (±0.04%) and a temperature coefficient of 3 ppm/°C. The device operates within an input voltage range of 3.5 V to 18 V, requiring a minimum headroom of 500 mV. It features a quiescent current of 3.75 mA, sourcing up to 10 mA and sinking up to -5 mA. Noise performance is 1.4 µV p-p in the 0.1 Hz to 10 Hz band. It is housed in an 8-lead SOIC package and functions over a temperature range of -40°C to +125°C.

Feature Summary

• XFET technology minimizes voltage change vs. temperature nonlinearity for superior stability.
• Capable of sourcing 10 mA and sinking 5 mA output current.
• Includes a TRIM pin for adjusting output voltage without compromising performance.
• 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 suffix 'BRZ' corresponds to the B grade electrical specifications and the SOIC package type required for your design. Confirm that the input voltage range meets the minimum requirement of 3.5 V for the 3.0 V output variant. Ensure thermal management accounts for the specified junction-to-ambient resistance when operating at maximum load currents.

Selection Notes

Select this component when ultralow noise and high accuracy are critical for signal integrity. The B grade offers tighter tolerance than the A grade. Consider the available trim functionality if system-level calibration is necessary. Verify that the 8-lead SOIC footprint fits the PCB layout constraints compared to MSOP alternatives.

Part Context

This part belongs to the ADR440/ADR441/ADR443/ADR444/ADR445 family of XFET voltage references. These devices share common architectural features including low dropout operation and trim capabilities. The ADR443 specifically targets applications requiring a 3.0 V reference, distinguishing it from other voltages in the series while maintaining identical noise and drift characteristics relative to its grade.

Replacement Considerations

Public confirmed substitute: ADR4530ARZ.

FAQ

How does the XFET technology improve performance compared to buried Zener references?

XFET technology yields lower noise performance and better temperature drift curvature correction than buried Zener references, resulting in minimized voltage change versus temperature nonlinearity.

What is the function of the TRIM pin on the ADR443BRZ?

The TRIM pin allows the user to adjust the output voltage over a 0.5% range to correct for errors from the reference or overall system errors without compromising performance.