ADR445BRZ

Overview

The ADR445BRZ is a precision voltage reference from Analog Devices, utilizing XFET technology to deliver ultralow noise and high accuracy. It provides a fixed output 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 a supply range of 5.5 V to 18 V, requiring a minimum headroom of 500 mV. It features a quiescent current of 3.75 mA, sourcing up to 10 mA and sinking up to -5 mA. Noise performance is rated at 2.25 µV p-p in the 0.1 Hz to 10 Hz band. It is housed in an 8-lead SOIC package and functions across a temperature range of -40°C to +125°C.

Feature Summary

• XFET technology minimizes voltage change versus temperature nonlinearity for superior stability.
• Capable of sourcing 10 mA and sinking 5 mA output current.
• Includes a dedicated trim terminal for adjusting output voltage without compromising performance.
• Operates with low dropout requirements, needing only 500 mV of supply voltage headroom.

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 'BRZ' corresponds to the B-grade electrical specifications and the SOIC-8 package configuration. Confirm that the ordering code matches the manufacturer's official documentation for the 5.0 V variant. Ensure compatibility with the required thermal resistance and operating temperature range for the target application environment before finalizing procurement.

Selection Notes

Select this component when a fixed 5.0 V reference with high precision and low noise is required. The B-grade specification ensures a tighter temperature coefficient compared to the A-grade. Consider the 500 mV dropout requirement against the available supply voltage. The inclusion of a trim pin allows for system-level error correction if necessary.

Part Context

This part belongs to the ADR44x series 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 generation and high output drive capability. The ADR445 specifically targets applications requiring a standard 5.0 V rail with stringent accuracy and drift requirements.

Replacement Considerations

Other members of the ADR44x family offer different fixed voltages but share similar electrical characteristics. Verify that alternative parts match the required output voltage and package type. Cross-referencing with other XFET or buried Zener references requires checking noise and drift specifications against these benchmarks.

FAQ

What is the function of Pin 5 on the ADR445BRZ?

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

How does the ADR445BRZ handle short circuits?

The device can withstand indefinite short-circuit duration to ground, with a short-circuit current rating of 27 mA.