ADR431ARM

Overview

The ADR431ARM is a precision voltage reference from the XFET series, manufactured by Analog Devices Inc. It provides a fixed output voltage of 2.5 V with an initial accuracy of ±0.12% (A Grade). The device operates within a supply voltage range of 4.5 V to 18 V and features a low temperature coefficient of 10 ppm/°C. It draws a quiescent current of 800 µA maximum and supports high output source and sink currents of +30 mA and −20 mA respectively. The unit is housed in an 8-lead MSOP package and functions over an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Utilizes patented XFET technology for exceptionally low noise performance without requiring external capacitors.
• Features a dedicated trim terminal allowing output voltage adjustment over a 0.5% range.
• Capable of sourcing up to 30 mA and sinking up to 20 mA of load current.

Applications

• Precision data acquisition systems
• High resolution data converters
• Medical instruments

Procurement Notes

Verify the specific grade suffix (e.g., ARMZ) against the required accuracy and temperature coefficient specifications. Confirm the package type matches the design footprint. Check manufacturer documentation for RoHS compliance status and lead-free soldering recommendations. Ensure input voltage headroom requirements are met for the intended operating conditions.

Selection Notes

Select this component when low noise and high accuracy are critical for signal integrity. The A Grade specification suits applications requiring tighter tolerance than standard references. Consider the 2 V minimum headroom requirement relative to the system supply voltage. Evaluate the thermal resistance characteristics if high load currents or elevated ambient temperatures are expected.

Part Context

This part belongs to the ADR43x family of ultralow noise XFET voltage references. The family includes variants with different nominal output voltages such as 2.048 V, 3.000 V, and 4.096 V. All members share similar architectural benefits including low power consumption and high stability across wide temperature ranges.

Replacement Considerations

ADR431ARZ

FAQ

Does the ADR431ARM require an external bypass capacitor?

No external capacitor is required for basic operation, though a 0.1 µF capacitor may be added to improve noise suppression.

How can the output voltage be adjusted?

The output voltage can be adjusted over a 0.5% range using the dedicated TRIM pin.