ADR420AR

Overview

The ADR420AR is an ultraprecision, low noise XFET voltage reference with a fixed output of 2.048 V. It features a maximum quiescent current of 500 µA and supports up to 10 mA load current. The device operates within a supply range of 4 V to 18 V and maintains stability across a temperature range of −40°C to +125°C. Electrical specifications include a line regulation of 35 ppm/V, load regulation of 70 ppm/mA, and initial accuracy grades of ±1 mV or ±3 mV.

Feature Summary

• Utilizes second-generation 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 coefficient performance.
• Provides high long-term stability and low noise characteristics suitable for precision conversion applications.

Applications

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

Procurement Notes

Verify the specific grade (A or B) required for your application, as initial accuracy and temperature coefficients vary between these electrical grades. Confirm that the SOIC-8 package matches your PCB footprint requirements. Ensure input voltage headroom meets the minimum 2 V differential requirement relative to the 2.048 V output under all operating conditions.

Selection Notes

Select the ADR420AR when a precise 2.048 V reference is needed with minimal power consumption. Choose Grade B for tighter initial accuracy and lower temperature coefficients if cost allows. Consider the available trim capability if system-level calibration is necessary to compensate for external component tolerances or thermal drifts in the final assembly.

Part Context

The ADR420AR belongs to the ADR42x series of XFET voltage references from Analog Devices. This family includes variants with different fixed output voltages such as 2.500 V, 3.00 V, and 5.00 V. All members share the same architectural benefits, including low noise, high accuracy, and excellent long-term stability within standard SOIC and MSOP packages.

Replacement Considerations

Direct functional replacements within the same series include the ADR421 (2.500 V), ADR423 (3.00 V), and ADR425 (5.00 V). These parts share identical pinouts and package options but differ in nominal output voltage. Verify that the specific application circuitry can accommodate the alternative voltage levels before substitution.