ADR431BRMZ

Overview

The ADR431BRMZ is a precision series voltage reference from the Analog Devices XFET family, providing a fixed 2.500 V output in an 8-lead MSOP package. It features B-grade accuracy with ±1 mV initial error and a maximum temperature coefficient of 3 ppm/°C over the −40°C to +125°C range. The device operates on a supply voltage between 4.5 V and 18 V with only 2 V headroom, consuming 800 µA quiescent current. It delivers 30 mA sourcing and −20 mA sinking current, includes a trim terminal for ±5% adjustment, and exhibits 3.5 µV p-p noise (0.1 Hz to 10 Hz).

Feature Summary

• Utilizes XFET technology for low noise and minimal thermal drift.
• Capable of sourcing up to 30 mA and sinking up to −20 mA.
• Includes a dedicated trim pin for precise output voltage adjustment.
• Requires no external compensation capacitor for standard operation.

Applications

• Precision data acquisition systems
• High resolution data converters
• Medical instruments
• Industrial process control systems

Procurement Notes

Verify the specific suffix 'MZ' corresponds to the MSOP-8 package configuration when ordering. Confirm that the 'B' grade designation matches the required 3 ppm/°C temperature coefficient specification for your application. Ensure the input voltage range meets the minimum 4.5 V requirement for proper regulation.

Selection Notes

Select this component when high accuracy and low noise are critical requirements. The B-grade variant offers tighter tolerance than the A-grade option. Consider the 800 µA supply current for power-sensitive designs. Verify that the 2 V minimum headroom requirement fits within the system's available voltage margin.

Part Context

This part belongs to the ADR43x series of ultralow noise XFET voltage references. The family includes variants with different fixed output voltages such as 2.048 V, 3.000 V, 4.096 V, and 5.000 V. All members share similar performance characteristics regarding noise, current capability, and package options.

Replacement Considerations

ADR431ARZ provides equivalent electrical specifications in an 8-lead SOIC package.

FAQ

What is the function of the COMP pin?

The COMP pin serves as the compensation input. Connecting a series resistor and capacitor network from COMP to VOUT reduces overall noise.

How does the XFET technology benefit this reference?

XFET technology minimizes voltage change versus temperature nonlinearity and results in exceptionally low noise compared to traditional band gap references.