ADR421ARMZ

Overview

The ADR421ARMZ is a second-generation XFET voltage reference manufactured by Analog Devices Inc., housed in an 8-lead MSOP package. It provides a fixed output voltage of 2.5 V with an initial accuracy of ±0.12% and a temperature coefficient of 3 ppm/°C. The device operates within a supply voltage range of 4.5 V to 18 V, drawing a maximum quiescent current of 500 µA. It supports a maximum load current of 10 mA and functions reliably across an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Utilizes patented eXtra implanted junction FET (XFET) technology for superior accuracy and thermal hysteresis compared to band gap references.
• Features a dedicated trim terminal allowing output voltage adjustment over a ±0.5% range without compromising temperature stability.
• Delivers low noise performance with a typical value of 1.75 µV p-p in the 0.1 Hz to 10 Hz frequency band.

Applications

• Precision data acquisition systems
• High resolution converters
• Battery-powered instrumentation
• Portable medical instruments
• Optical network control circuits

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific grade (A or B) matches design requirements, as electrical specifications vary between grades. Ensure the MSOP-8 package footprint aligns with PCB layout constraints. Check for recent Product Change Notices regarding manufacturing updates.

Selection Notes

Select this component when low noise and high precision are critical for signal chain integrity. The XFET architecture offers lower power consumption than buried Zener references while maintaining excellent long-term stability. Consider the available trim capability if system calibration requires fine-tuning the reference voltage beyond standard tolerances.

Part Context

The ADR421ARMZ belongs to the ADR42x series of ultraprecision voltage references, which also includes models with different nominal output voltages such as 2.048 V, 3.00 V, and 5.00 V. All members of this family share the same core XFET technology and package options, differing primarily in their factory-set output voltage and associated accuracy grades.

Replacement Considerations

ADR421BRZ