ADR420ARM

Overview

The ADR420ARM is a second-generation XFET voltage reference providing a fixed 2.048 V output in an 8-lead MSOP package. It features low noise of 1.75 μV p-p (0.1 Hz to 10 Hz) and a temperature coefficient of 3 ppm/°C for the B grade. The device operates with a supply voltage range of 4 V to 18 V, drawing a maximum quiescent current of 500 μA. It supports up to 10 mA load current and maintains stability over an extended industrial temperature range from −40°C to +125°C.

Feature Summary

• Utilizes eXtra implanted junction FET (XFET) technology for superior accuracy and thermal hysteresis compared to band gap references.
• Incorporates patented temperature drift curvature correction to minimize nonlinearity of voltage change with temperature.
• Offers a trim terminal allowing output voltage adjustment over a ±0.5% range without compromising other performance characteristics.

Applications

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

Procurement Notes

Verify the specific electrical grade (A or B) required for your application, as initial accuracy and temperature coefficient specifications differ between grades. Confirm that the 8-lead MSOP package variant matches your PCB footprint requirements. Ensure input voltage headroom meets the minimum 2 V requirement relative to the output voltage during operation.

Selection Notes

Select the ADR420 when a precise 2.048 V reference is needed. Consider the B grade for tighter initial accuracy (±0.05%) and lower temperature coefficient (3 ppm/°C). Evaluate power dissipation if operating at high load currents or elevated ambient temperatures, as junction temperature depends on θJA and supply voltage differential.

Part Context

The ADR420 is part of the ADR42x series, which includes the ADR421 (2.500 V), ADR423 (3.00 V), and ADR425 (5.00 V). All members share the same XFET architecture, pinout, and general feature set, differing primarily in nominal output voltage and specific electrical grade parameters.

Replacement Considerations

Direct functional substitutes within the same family include the ADR421, ADR423, and ADR425, provided the system can accommodate their respective nominal output voltages (2.500 V, 3.00 V, and 5.00 V). No other direct cross-model replacements are documented in the source material.