ADR433ARMZ

Overview

The ADR433ARMZ is a precision XFET voltage reference providing a nominal 3.0 V output in an 8-lead MSOP package. It operates within a supply voltage range of 5.0 V to 18 V with a minimum headroom of 2 V. The device draws a typical quiescent current of 800 µA and supports sourcing up to 30 mA and sinking up to -20 mA. Key electrical specifications include an initial accuracy of ±0.13% (±4 mV) for the A grade, a maximum temperature coefficient of 10 ppm/°C, and low noise performance of 3.75 µV p-p from 0.1 Hz to 10 Hz.

Feature Summary

• Utilizes XFET technology with temperature drift curvature correction to minimize voltage change versus temperature nonlinearity.
• Features a dedicated trim terminal allowing output voltage adjustment over a ±5% range without compromising performance.
• Capable of high output current drive, sourcing up to 30 mA and sinking up to -20 mA.
• Requires no external capacitor for stability while maintaining ultralow noise characteristics.

Applications

• Precision data acquisition systems
• High resolution data converters
• Medical instruments
• Industrial process control systems

Procurement Notes

Verify the specific grade suffix (e.g., ARMZ) against the manufacturer's ordering guide to confirm initial accuracy and temperature coefficient specifications. Ensure the input voltage remains within the 5.0 V to 18 V operating range to maintain regulation. Confirm thermal management requirements for the MSOP package based on expected power dissipation under load conditions.

Selection Notes

Select this component when a stable 3.0 V reference is required with minimal external filtering. The XFET architecture offers superior noise performance compared to traditional bandgap references. Consider the available trim capability if precise voltage calibration is necessary during system integration. Verify that the load current requirements do not exceed the specified sourcing or sinking limits.

Part Context

This part belongs to the ADR43x series of ultralow noise XFET voltage references manufactured by Analog Devices. The series includes variants with different nominal output voltages ranging from 2.048 V to 5.000 V. All members share similar architectural features, including low supply current and high output drive capability, designed for demanding analog signal processing applications.

Replacement Considerations

Direct functional substitutes within the same family include the ADR430, ADR431, ADR434, and ADR435, provided the specific output voltage matches the design requirement. Cross-family replacements require careful evaluation of pin compatibility, noise specifications, and thermal characteristics.

FAQ

What is the purpose of the COMP pin?

The COMP pin serves as the compensation input. Connecting a series resistor and capacitor network from COMP to VOUT reduces overall noise.

How does the XFET technology improve performance?

XFET technology minimizes voltage change versus temperature nonlinearity through temperature drift curvature correction, resulting in lower noise compared to standard bandgap references.