ADR423ARMZ

Overview

The ADR423ARMZ is a second-generation XFET voltage reference providing a nominal 3.00 V output in an 8-lead MSOP package. It features a maximum quiescent current of 500 µA and supports a maximum load current of 10 mA. The device operates within a supply voltage range of 5 V to 18 V, maintaining stability across an extended temperature range from -40°C to +125°C. Key electrical specifications include a typical initial accuracy of 0.04% (B Grade) or 0.13% (A Grade), a temperature coefficient of 3 ppm/°C (B Grade) or 10 ppm/°C (A Grade), and low noise performance of 2 µV p-p over the 0.1 Hz to 10 Hz frequency band.

Feature Summary

• Utilizes patented eXtra implanted junction FET (XFET) technology for superior thermal hysteresis and low noise compared to traditional band gap references.
• Includes a dedicated TRIM terminal allowing output voltage adjustment over a ±0.5% range without compromising temperature coefficient performance.
• Offers indefinite short-circuit protection capability when connected directly to ground.

Applications

• Precision data acquisition systems
• High resolution analog-to-digital converters
• 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 grades. Confirm the package type matches the design footprint, as the ADR423 series is available in both SOIC and MSOP configurations. Ensure the input voltage meets the minimum headroom requirement relative to the 3.00 V output. Check for RoHS compliance status if environmental regulations apply to the manufacturing process.

Selection Notes

Select the ADR423ARMZ when a stable 3.00 V reference with low power consumption is needed. The B Grade offers tighter accuracy and lower drift, suitable for high-precision instrumentation. The A Grade provides broader availability with slightly relaxed specifications. Consider the MSOP package for space-constrained designs requiring surface-mount assembly. Evaluate the need for external trimming if system-level calibration is necessary to compensate for trace errors.

Part Context

The ADR423 is part of the ADR42x family of ultraprecision voltage references manufactured by Analog Devices. This series includes variants with different nominal outputs: 2.048 V (ADR420), 2.500 V (ADR421), and 5.00 V (ADR425). All members share the same XFET architecture, pinout, and general characteristics, differing primarily in their factory-trimmed output voltage levels.

Replacement Considerations

Direct functional replacements within the same series include the ADR423ARZ (SOIC package) and ADR423ARZ-REEL7. Cross-series alternatives like the ADR421 or ADR425 require circuit redesign due to different output voltages. Verify that any substitute maintains the required 5 V to 18 V operating range and 10 mA load capability.