ADR439BR

Overview

The ADR439BR is a precision voltage reference from the Analog Devices XFET series, providing a fixed output of 4.5 V with B-grade initial accuracy of ±2 mV (±0.04%). It operates within an input voltage range of 6.5 V to 18 V and features a maximum temperature coefficient of 3 ppm/°C over the -40°C to +125°C industrial temperature range. The device draws a typical quiescent current of 800 µA and supports high output source and sink currents of +30 mA and -20 mA respectively.

Feature Summary

• Utilizes patented XFET technology for low noise and minimized thermal drift curvature
• Provides high drive capability with both sourcing and sinking output current
• Includes a dedicated trim terminal for precise output voltage adjustment

Applications

• Precision data acquisition systems
• High resolution data converters
• Medical instruments
• Industrial process control systems

Procurement Notes

Verify the specific package type required for your design, as the ADR439BR is available in both 8-lead MSOP and narrow SOIC configurations. Confirm that the B-grade accuracy specifications meet your system requirements before finalizing procurement. Ensure the input voltage supply remains within the specified operating range to maintain performance.

Selection Notes

Select the ADR439BR when a stable 4.5 V reference is needed with low power consumption and high current drive capabilities. Consider the XFET architecture for applications requiring superior noise performance compared to standard bandgap references. Evaluate the thermal resistance characteristics if operating at higher load currents or elevated ambient temperatures.

Part Context

This component belongs to the ADR43x family of ultralow noise XFET voltage references. The series includes various output voltages such as 2.048 V, 2.5 V, 3 V, 4.096 V, 5 V, and 4.5 V. All members share common features like low quiescent current, wide operating temperature ranges, and high accuracy grades.

Replacement Considerations

ADR439ARZ