ADR425ARZ-REEL7

Overview

The ADR425ARZ-REEL7 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 high initial accuracy of ±0.12%. The device operates with a supply voltage range of 7 V to 18 V, drawing a maximum quiescent current of 600 µA across the −40°C to +125°C temperature range. It delivers up to 10 mA of output current with excellent long-term stability.

Feature Summary

• Utilizes patented XFET architecture for superior thermal hysteresis and lower noise compared to band gap references.
• Includes a dedicated trim terminal allowing output voltage adjustment within a ±0.5% range without compromising other performance metrics.
• Offers extended industrial operating temperature coverage from −40°C to +125°C.

Applications

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

Procurement Notes

Verify the specific electrical grade (A or B) required for your application, as specifications such as temperature coefficient and initial accuracy vary between grades. Confirm that the input voltage headroom meets the minimum requirement of 2 V above the 5 V output. Ensure the selected package matches the PCB footprint, as MSOP variants are also available within the series.

Selection Notes

Select this component when designing precision analog front ends requiring stable reference voltages under varying load conditions. The 10 mA output capability supports direct driving of ADCs or DACs. Consider the ±0.5% trim feature if system-level calibration is necessary to compensate for external resistor tolerances or board-level errors.

Part Context

This part belongs to the ADR42x series of ultraprecision voltage references manufactured by Analog Devices. The series includes variants with different nominal outputs, specifically 2.048 V, 2.500 V, 3.00 V, and 5.00 V. All members share the same core XFET technology and pinout configurations, differing primarily in their factory-trimmed output voltage levels.

Replacement Considerations

ADR425ARMZ-REEL7

FAQ

Is an output capacitor required for stability?

No, the ADR425 does not require an output capacitor for stability under any load condition. However, adding a small capacitor can help filter noise.

What is the function of pins 1 and 8?

Pins 1 and 8 are Test Pins (TP). They have internal connections reserved for factory testing and should not be connected in the final circuit design.