ADR421ARMZ-REEL7

Overview

The ADR421ARMZ-REEL7 is a second-generation XFET voltage reference manufactured by Analog Devices Inc. It provides a fixed output voltage of 2.500 V with an initial accuracy of ±0.12% and a temperature coefficient of 3 ppm/°C. The device operates within an input voltage range of 4.5 V to 18 V and supports a maximum load current of 10 mA. Quiescent current is typically 500 µA, and the unit delivers low noise performance of 1.75 µV p-p from 0.1 Hz to 10 Hz. It 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

• Utilizes patented XFET technology for superior thermal hysteresis and long-term stability compared to band gap references.
• Features a dedicated trim terminal allowing output voltage adjustment over a ±0.5% range without compromising temperature coefficients.
• Offers high precision with low noise density and excellent line and load regulation characteristics.

Applications

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

Procurement Notes

Verify that the specific ordering suffix matches the required packaging format, as the REEL7 designation indicates tape and reel packaging. Confirm the grade (A or B) if tighter accuracy specifications are necessary for the application. Ensure the MSOP-8 footprint aligns with the PCB layout constraints. Cross-reference the datasheet revision to confirm all electrical parameters match the design requirements before finalizing procurement.

Selection Notes

Select this component when low noise and high accuracy are critical for signal integrity in precision measurement applications. The XFET architecture is suitable for designs requiring minimal power consumption while maintaining stability over wide temperature variations. Consider the available trim capability if system-level calibration is needed to compensate for external circuit errors. Evaluate the thermal resistance of the MSOP package against the expected power dissipation in the target environment.

Part Context

This part belongs to the ADR42x series of ultraprecision voltage references, which 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 pinout configurations, facilitating design scalability across various voltage requirements. The series is designed to replace older generation references in high-performance analog signal chains.

Replacement Considerations

ADR421ARZ-REEL7