ADR425AR

Overview

The ADR425AR is a second-generation XFET voltage reference providing a fixed 5.00 V output in an 8-lead SOIC package. It features low noise of 3.4 µV p-p (0.1 Hz to 10 Hz) and a temperature coefficient of 3 ppm/°C for B Grade or 10 ppm/°C for A Grade. The device operates with a supply voltage range of 7 V to 18 V, drawing a maximum quiescent current of 0.5 mA. It supports up to 10 mA load current and maintains long-term stability of 50 ppm per 1000 hours across the −40°C to +125°C industrial temperature range.

Feature Summary

• Utilizes patented XFET technology to minimize nonlinearity of voltage change with temperature.
• Offers superior accuracy and thermal hysteresis compared to band gap references.
• Includes a trim terminal allowing ±0.5% output voltage adjustment without compromising other performance metrics.

Applications

• Precision data acquisition systems
• High resolution converters
• Optical network control circuits

Procurement Notes

Verify the specific grade (A or B) required for your application, as initial accuracy and temperature coefficients differ between them. Confirm the package type matches the design footprint, as MSOP variants are also available within this series. Ensure input voltage headroom meets the minimum 2 V requirement relative to the 5 V output during operation.

Selection Notes

Select the ADR425AR when a stable 5 V reference is needed for high-precision analog-to-digital conversion stages. Consider the XFET architecture for applications demanding low noise and excellent long-term stability over wide temperature variations. Evaluate the trim pin utility if system-level calibration is necessary to compensate for board-level errors.

Part Context

This component belongs to the ADR42x series of ultraprecision voltage references from Analog Devices. The series includes variants with different nominal outputs such as 2.048 V, 2.500 V, and 3.00 V. All members share the same XFET core technology, offering low noise and high accuracy in both SOIC and MSOP packages.

Replacement Considerations

Direct functional substitutes within the same series include ADR425ARMZ (MSOP package). Cross-series alternatives like ADR421 or ADR423 require output voltage adaptation via external trimming or circuit redesign due to different nominal voltages.