ADR444ARZ-REEL7

Overview

The ADR444ARZ-REEL7 is an ultralow noise, low dropout (LDO) XFET voltage reference with a fixed output of 4.096 V. It features a temperature coefficient of 10 ppm/°C and initial accuracy of ±5 mV. The device operates within an input range of 4.6 V to 18 V, requiring a minimum headroom of 500 mV. It provides high output source current (+10 mA) and sink current (-5 mA). Quiescent current is 3.75 mA. Voltage noise is 1.8 µV p-p from 0.1 Hz to 10 Hz. It is housed in an 8-lead SOIC package.

Feature Summary

• Utilizes patented XFET technology for ultralow noise performance and minimized temperature drift nonlinearity.
• Features a dedicated TRIM pin allowing output voltage adjustment over a 0.5% range without compromising performance.
• Capable of sourcing up to +10 mA and sinking up to -5 mA output current.
• Operates with low supply voltage headroom of 500 mV.

Applications

• Precision data acquisition systems
• High resolution data converters
• Battery-powered instrumentation
• Portable medical instruments
• Industrial process control systems

Procurement Notes

Verify the specific electrical grade (A or B) required for your application, as the datasheet lists distinct accuracy and temperature coefficient specifications for each grade. Confirm that the 8-lead SOIC package matches your PCB footprint requirements. Ensure the input voltage supply meets the minimum headroom requirement relative to the 4.096 V output.

Selection Notes

Select this component when ultralow noise and high precision are critical for signal integrity. The ADR444 variant is specifically chosen for applications requiring a 4.096 V reference. Consider the A grade for standard industrial accuracy or the B grade if tighter tolerance and lower temperature drift are necessary. Evaluate power dissipation constraints given the 3.75 mA quiescent current.

Part Context

This part belongs to the ADR44x series of XFET voltage references manufactured by Analog Devices. The series includes variants with different fixed output voltages such as 2.048 V, 2.5 V, 3 V, and 5 V. All members share the same core technology, offering ultralow noise and superb temperature stability across the extended industrial temperature range.

Replacement Considerations

ADR444ARMZ-REEL7

FAQ

What is the function of Pin 5?

Pin 5 is the TRIM terminal, which allows the user to adjust the output voltage over a 0.5% range by connecting a potentiometer between the output and ground.

How does the XFET technology improve performance compared to buried Zener references?

XFET technology offers better noise performance than buried Zener references and operates effectively off low supply voltage headroom (500 mV).