ADR434ARMZ

Overview

The ADR434ARMZ is a precision voltage reference from Analog Devices, part of the XFET series. It provides a nominal output voltage of 4.096 V with an initial accuracy of ±5 mV (A Grade) or ±1.5 mV (B Grade). The device features a maximum temperature coefficient of 10 ppm/°C for A Grade and 3 ppm/°C for B Grade. It operates within a supply voltage range of 6.1 V to 18 V, requiring a minimum headroom of 2 V. Quiescent current is typically 800 µA. The component supports sourcing up to 30 mA and sinking up to -20 mA. It is housed in an 8-lead MSOP package and functions over an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Utilizes XFET technology to minimize voltage change versus temperature nonlinearity.
• Offers high output source and sink current capabilities without external capacitors.
• Includes a trim terminal for adjusting output voltage over a ±5% range.
• Provides low noise performance suitable for precision applications.

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, as accuracy and temperature coefficient specifications differ between versions. Confirm the package type matches your PCB footprint requirements. Ensure the supply voltage meets the minimum headroom requirement relative to the 4.096 V output. Check for any recent Product Change Notices that may affect pinout or electrical characteristics.

Selection Notes

Select the ADR434ARMZ when a stable 4.096 V reference is needed with low drift and high current drive capability. Consider the B Grade if tighter initial accuracy and lower temperature coefficients are critical. Evaluate the power supply constraints to ensure the 2 V headroom requirement is met across all operating conditions. Compare against other XFET references if different output voltages or noise levels are preferred.

Part Context

This component belongs to the ADR430/ADR431/ADR433/ADR434/ADR435 family of ultralow noise XFET voltage references. These devices share common architectural features, including low quiescent current and high output drive strength. The ADR434 specifically targets applications requiring a 4.096 V reference, which is a standard value for many analog-to-digital converter systems.

Replacement Considerations

Direct replacements within the same family include the ADR434ARZ (SOIC package) or ADR434ARMZ-REEL7 (tape and reel packaging). Other models like ADR430, ADR431, ADR433, and ADR435 offer different output voltages but similar performance characteristics.