ADR439ARZ

Overview

The ADR439ARZ is a precision XFET voltage reference providing a fixed 4.5 V output with an initial accuracy of ±0.12% (A Grade) and a maximum temperature coefficient of 10 ppm/°C. It operates within a supply voltage range of 6.5 V to 18 V, requiring only 2 V of headroom. The device delivers high output source current up to +30 mA and sink current up to -20 mA while maintaining low quiescent current consumption of 800 µA. Low noise performance is specified at 7.5 µV p-p from 0.1 Hz to 10 Hz.

Feature Summary

• Utilizes patented XFET technology for exceptionally low noise and minimized thermal drift curvature
• Features a dedicated trim terminal allowing output voltage adjustment over a 0.5% range without compromising performance
• Capable of sourcing up to 30 mA and sinking up to 20 mA of load current
• Requires no external compensation capacitor for basic stability

Applications

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

Procurement Notes

Verify the specific grade suffix against the datasheet ordering guide to confirm accuracy and temperature coefficient specifications. Ensure the input voltage remains above the minimum operating threshold of 6.5 V to maintain regulation. Confirm package availability matches the required 8-lead SOIC or MSOP form factor for the design.

Selection Notes

Select this component when a stable 4.5 V reference is required with minimal external filtering. The low headroom requirement makes it suitable for 5 V systems where standard buried Zener references are inefficient. Consider the trim pin utility if system-level calibration is necessary to offset initial tolerance errors.

Part Context

The ADR439ARZ belongs to the ADR43x family of ultralow noise XFET voltage references manufactured by Analog Devices. This series integrates temperature drift curvature correction to achieve superior long-term stability compared to traditional bandgap references. The part is designed for applications demanding high DC precision and low power consumption in industrial and medical environments.

Replacement Considerations

Cross-reference with other members of the ADR43x family such as the ADR430, ADR431, ADR433, ADR434, or ADR435 if different output voltages are acceptable. Verify that substitute parts match the required output current capabilities and package dimensions.