ADR445BRZ-REEL7

Overview

The ADR445BRZ-REEL7 is a precision voltage reference from the ADR44x series, manufactured by Analog Devices Inc. It provides a fixed output voltage of 5.0 V with an initial accuracy of ±2 mV (±0.04%) and a temperature coefficient of 3 ppm/°C. The device operates within an input voltage range of 5.5 V to 18 V and requires a minimum supply headroom of 500 mV. It features ultralow noise performance of 2.25 µV p-p in the 0.1 Hz to 10 Hz band. The component supports sourcing up to +10 mA and sinking up to −5 mA of load current, with a typical quiescent current of 3.75 mA. It is housed in an 8-lead SOIC package and functions over an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Utilizes XFET technology for low dropout operation and minimized voltage change versus temperature nonlinearity.
• Provides high output source and sink current capabilities without compromising stability.
• Includes a dedicated trim terminal allowing output voltage adjustment over a 0.5% range.

Applications

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

Procurement Notes

Verify the specific suffix 'REEL7' indicates tape-and-reel packaging when ordering. Confirm that the B-grade designation corresponds to the required 3 ppm/°C temperature coefficient and ±2 mV initial accuracy specifications. Ensure the design accommodates the 500 mV minimum dropout voltage relative to the 5.0 V output. Check for RoHS compliance status as indicated in the manufacturer documentation prior to final procurement.

Selection Notes

Select this component for applications requiring ultralow noise and high accuracy in a compact surface-mount package. The B-grade specification ensures superior temperature stability compared to the A-grade variant. Consider the 5.0 V output level against system requirements and verify that the available input voltage range meets the minimum headroom constraints. Evaluate thermal resistance characteristics if operating near maximum ambient temperatures.

Part Context

This part belongs to the ADR44x family of XFET voltage references, which includes models with outputs ranging from 2.048 V to 5.0 V. The family shares common architectural features such as low noise density and high ripple rejection. The ADR445 specifically targets applications needing a standard 5.0 V reference with tight tolerance. Other family members like the ADR444 or ADR441 offer different voltage levels but maintain similar performance characteristics regarding noise and drift.

Replacement Considerations

Direct substitutes within the same family include other ADR44x variants with different output voltages if the system allows voltage adjustment. Cross-family replacements may require verification of pin compatibility and electrical parameter alignment. Ensure any alternative maintains the required 3 ppm/°C temperature coefficient and ultralow noise specifications for precision applications.