ADR434ARM

Overview

The ADR434ARM is a series precision voltage reference from Analog Devices, utilizing patented XFET technology to minimize temperature drift curvature nonlinearity. It provides a nominal output of 4.096 V with an initial accuracy of ±5 mV (±0.12%) for the A grade and ±1.5 mV (±0.04%) for the B grade. The device operates within a supply voltage range of 6.1 V to 18 V, requiring only 2 V of headroom. Key electrical parameters include a maximum temperature coefficient of 10 ppm/°C (A grade) or 3 ppm/°C (B grade), quiescent current of 800 µA, and high output drive capability sourcing up to 30 mA and sinking up to 20 mA. It features low noise performance of 6.25 µV p-p in the 0.1 Hz to 10.0 Hz band.

Feature Summary

• XFET technology minimizes voltage change vs. temperature nonlinearity for superior stability.
• Capable of sourcing up to 30 mA and sinking up to 20 mA without external components.
• Includes a trim terminal allowing output voltage adjustment over a ±0.5% range.
• Operates with low supply current and requires minimal input-to-output voltage headroom.

Applications

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

Procurement Notes

Verify the specific grade (A or B) required for your application's accuracy needs, as specifications differ between ±5 mV and ±1.5 mV initial accuracy. Confirm the package type matches your PCB footprint requirements. Ensure the input voltage stays within the 6.1 V to 18 V operating range to maintain regulation. Check for any specific environmental compliance documentation if required by your manufacturing standards.

Selection Notes

Select the ADR434ARM when a stable 4.096 V reference is needed with high current drive capabilities. Choose the B grade for applications demanding tighter initial accuracy and lower temperature coefficients. Consider the MSOP-8 package for space-constrained designs. This component is suitable for replacing standard buried Zener references where lower power consumption and smaller headroom are critical.

Part Context

The ADR434ARM belongs to the ADR43x family of ultralow noise XFET voltage references. This series includes variants with different output voltages such as 2.048 V, 2.500 V, 3.000 V, 5.000 V, and 4.500 V. All members share the same core XFET architecture, offering low noise, low temperature drift, and high output current capability in 8-lead MSOP and SOIC packages.

Replacement Considerations

Direct pin-compatible replacements within the same family include ADR434ARZ (SOIC-8 package). Other models like ADR430, ADR431, ADR433, ADR435, and ADR439 offer different output voltages but share similar electrical characteristics and packaging options.