ADR420ARZ

Overview

The ADR420ARZ is a second-generation XFET voltage reference with a nominal output of 2.048 V, available in an 8-lead SOIC package. It features low noise (1.75 μV p-p from 0.1 Hz to 10 Hz) and high accuracy (±3 mV initial error for Grade A). The device operates within a supply range of 4 V to 18 V, drawing a maximum quiescent current of 500 μA. It provides a high output current of 10 mA and maintains excellent long-term stability of 50 ppm over 1000 hours.

Feature Summary

• Utilizes patented eXtra implanted junction FET (XFET) technology to minimize temperature drift nonlinearity and achieve superior thermal hysteresis compared to band gap references.
• Features a dedicated trim terminal that allows the output voltage to be adjusted over a ±0.5% range without compromising other performance characteristics.
• Offers high output drive capability of up to 10 mA while maintaining low power consumption and requiring minimal supply headroom.

Applications

• Precision data acquisition systems
• High resolution analog-to-digital converters
• Optical network control circuits

Procurement Notes

Verify the specific electrical grade (A or B) required for your application, as parameters like initial accuracy and temperature coefficient vary between grades. Confirm the package type matches your PCB footprint requirements. Ensure input voltage remains within the specified operating range to maintain regulation. Check datasheet limits for absolute maximum ratings before implementation.

Selection Notes

Select the ADR420ARZ when a stable 2.048 V reference is needed with ultra-low noise and high precision. Consider the A-grade specifications if tighter initial accuracy and lower temperature coefficients are critical. Evaluate the need for the trim pin if system-level calibration is required. Compare against standard band gap references if lower noise and better long-term stability are priorities.

Part Context

The ADR420 is part of the ADR42x series, which includes the ADR421, ADR423, and ADR425 models offering different nominal output voltages. All members of this family share the same XFET architecture, pinout, and general performance characteristics, differing primarily in their factory-set output voltage levels and corresponding accuracy grades.

Replacement Considerations

Direct replacements include other ADR42x family members such as the ADR421, ADR423, or ADR425 if the specific output voltage differs but the package and performance profile remain suitable. Verify that any substitute component meets the required noise, stability, and current drive specifications for the design.