ADR445ARMZ-REEL7

Overview

The ADR445ARMZ-REEL7 is a precision voltage reference from the ADR44x series, utilizing XFET technology to achieve ultralow noise and high accuracy. It provides a fixed 5.0 V output with an initial accuracy of ±6 mV (A Grade) or ±2 mV (B Grade). The device features a temperature coefficient of 10 ppm/°C (A Grade) or 3 ppm/°C (B Grade) over the −40°C to +125°C range. It operates with a minimum supply voltage headroom of 500 mV and supports sourcing up to 10 mA and sinking up to −5 mA.

Feature Summary

• Ultralow noise performance in the 0.1 Hz to 10 Hz frequency band
• Low dropout operation requiring only 500 mV supply voltage headroom
• Integrated trim terminal for adjusting output voltage within a 0.5% range
• High output current capability with simultaneous source and sink functionality

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 accuracy and temperature coefficient specifications differ between grades. Confirm that the MSOP-8 package variant aligns with your PCB footprint requirements. Ensure input voltage constraints are met relative to the 5.0 V output to maintain regulation within the specified 500 mV headroom.

Selection Notes

Select this component when low noise and high stability are critical for signal integrity in precision measurement circuits. The ADR445ARMZ-REEL7 is suitable for applications requiring a stable 5.0 V reference with minimal drift over temperature variations. Consider the thermal resistance characteristics if operating near maximum load currents to manage junction temperature effectively.

Part Context

This part belongs to the ADR44x family of XFET voltage references, which includes variants with different output voltages such as 2.048 V, 2.5 V, 3.0 V, and 4.096 V. The ARMZ suffix indicates the MSOP-8 package, while the REEL7 suffix denotes tape-and-reel packaging. All members of this series share the same core XFET technology and pinout configuration.

Replacement Considerations

ADR445ARZ

FAQ

How does the XFET technology improve noise performance compared to traditional references?

XFET technology uses two junction field effect transistors (JFETs), one with an extra channel implant, to generate a reference voltage. This approach results in significantly lower noise because the correction term requires less amplification than in band gap references, reducing noise contributions from the compensation circuitry.

What is the function of the TRIM pin on the ADR445ARMZ-REEL7?

The TRIM pin allows users to adjust the output voltage over a limited range of ±0.5%. By connecting a potentiometer between the output and ground with the wiper connected to the TRIM pin, system errors can be trimmed out without compromising temperature performance.