ADR420ARMZ

Overview

The ADR420ARMZ is an ultraprecision XFET voltage reference manufactured by Analog Devices Inc. It provides a fixed output voltage of 2.048 V with an initial accuracy of ±0.15% and a temperature coefficient of 1 ppm/°C. The device operates within a supply voltage range of 4 V to 18 V, drawing a maximum quiescent current of 500 µA. It supports a maximum load current of 10 mA and features low noise performance of 1.75 µV p-p from 0.1 Hz to 10 Hz. 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

• Utilizes second-generation eXtra implanted junction FET (XFET) technology for superior accuracy and thermal hysteresis compared to band gap references.
• Features a patented temperature drift curvature correction technique that minimizes nonlinearity of the voltage change with temperature.
• Includes a dedicated trim terminal allowing output voltage adjustment over a ±0.5% range without compromising other performance metrics.

Applications

• Precision data acquisition systems
• High resolution converters
• Battery-powered instrumentation

Procurement Notes

Verify the specific suffix 'ARMZ' corresponds to the MSOP-8 package variant when sourcing. Confirm the grade selection, as the datasheet specifies distinct electrical parameters for A Grade and B Grade devices regarding initial accuracy and temperature coefficient. Ensure the input voltage headroom requirements are met for the intended operating conditions.

Selection Notes

Select this component for applications requiring low noise and high stability in compact surface-mount designs. Consider the 10 mA output drive capability against system load requirements. Evaluate the need for external trimming if tighter tolerance than the standard ±0.15% is required. Verify compatibility with the 8-lead MSOP footprint constraints.

Part Context

This part belongs to the ADR42x series of ultraprecision voltage references, which also includes models with different nominal output voltages such as 2.5 V, 3.0 V, and 5.0 V. All members of the series share the same XFET architecture and package options, differing primarily in their factory-set output voltage and associated accuracy grades.

Replacement Considerations

ADR421ARMZ

FAQ

Can the output voltage be adjusted?

Yes, the TRIM pin allows for output voltage adjustment over a ±0.5% range without affecting the temperature coefficient.

Is an output capacitor required for stability?

No, the ADR42x does not require an output capacitor for stability under any load condition, though one may be used for noise filtering.