ADR431ARMZ

Overview

The ADR431ARMZ is a series precision voltage reference utilizing XFET technology, providing a fixed output of 2.500 V with an initial accuracy of ±0.12% (A Grade). It operates within a supply voltage range of 4.5 V to 18 V and draws a typical quiescent current of 800 µA. The device features low noise performance of 3.5 µV p-p from 0.1 Hz to 10.0 Hz and a maximum temperature coefficient of 10 ppm/°C. It supports sourcing up to 30 mA and sinking up to -20 mA of load current. The component is housed in an 8-lead MSOP package and functions reliably across an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• XFET architecture minimizes voltage change versus temperature nonlinearity for high stability.
• Capable of sourcing 30 mA and sinking 20 mA without external buffering components.
• Includes a dedicated trim terminal allowing output voltage adjustment over a ±0.5% range.
• Delivers ultralow noise performance suitable for sensitive analog signal paths.

Applications

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

Procurement Notes

Verify the specific grade suffix (e.g., ARMZ) against the manufacturer's ordering guide to confirm the exact temperature coefficient and accuracy class required for the design. Confirm that the MSOP-8 package dimensions align with the PCB footprint constraints. Ensure the input voltage headroom requirements are met by the system power supply under all operating conditions.

Selection Notes

Select this component when low noise and high accuracy are critical for the reference voltage source. Consider the ADR431B grade if a tighter temperature coefficient of 3 ppm/°C is necessary. Evaluate the available trim pin functionality if fine-tuning the output voltage is required during calibration. Ensure the application does not exceed the absolute maximum ratings for short-circuit duration or storage temperatures.

Part Context

This part belongs to the ADR43x family of XFET voltage references manufactured by Analog Devices. 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 the same core technology, offering low noise, low drift, and bidirectional current drive capabilities in compact surface-mount packages.

Replacement Considerations

Direct functional replacements within the same family include the ADR430ARMZ, ADR433ARMZ, ADR434ARMZ, and ADR435ARMZ, provided the specific output voltage matches the circuit requirements. Other grades like ADR431BRMZ offer improved temperature coefficients but require verification of availability and pin compatibility.