ADR440ARZ-REEL7

Overview

The ADR440ARZ-REEL7 is an ultralow noise, LDO XFET voltage reference manufactured by Analog Devices Inc. It provides a fixed output voltage of 2.048 V with an initial accuracy of ±3 mV (±0.15%) and a temperature coefficient of 10 ppm/°C. The device operates within an input voltage range of 3 V to 18 V and requires a minimum supply headroom of 500 mV. It features a quiescent current of 3.75 mA and can source up to 10 mA while sinking up to -5 mA. The component is housed in an 8-lead SOIC package and functions reliably across an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Utilizes XFET technology for ultralow noise performance and low dropout operation.
• Includes a dedicated TRIM pin allowing output voltage adjustment over a 0.5% range.
• Capable of sourcing 10 mA and sinking 5 mA output current.
• Offers high stability with minimal thermal hysteresis.

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 distinguishes between different accuracy levels. Confirm that the 8-lead SOIC package aligns with your PCB footprint requirements. Ensure the input voltage supply meets the minimum headroom specification relative to the 2.048 V output. Check for any RoHS compliance documentation if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component when ultralow noise and high precision are critical for signal integrity. The ADR440 variant is specifically chosen for its 2.048 V output, which is standard for many ADC/DAC interfaces. Consider the A grade specifications if tighter tolerance limits are necessary compared to other series members. Evaluate the power dissipation constraints based on the maximum load current and ambient temperature conditions.

Part Context

This part belongs to the ADR44x family of XFET voltage references, which includes models like ADR441, ADR443, ADR444, and ADR445. These devices share similar architectural features but differ in output voltage and specific accuracy grades. The family is designed to replace traditional bandgap references in applications requiring superior noise performance and lower temperature drift.

Replacement Considerations

ADR440BRZ

FAQ

What is the function of the TRIM pin?

The TRIM pin allows users to adjust the output voltage over a 0.5% range to compensate for system errors without compromising temperature performance.

How does the XFET technology benefit this reference?

XFET technology minimizes voltage change versus temperature nonlinearity and provides lower noise performance compared to buried Zener references.