ADR434ARZ-REEL7

Overview

The ADR434ARZ-REEL7 is a precision voltage reference from the ADR43x series, manufactured by Analog Devices Inc. It provides a nominal output voltage of 4.096 V and operates within an input supply range of 6.1 V to 18 V. The device features low quiescent current consumption of 800 µA and supports high output source and sink currents up to 30 mA and -20 mA respectively. It utilizes XFET technology to achieve low noise performance and low temperature drift. The component is housed in an 8-lead SOIC package and is specified for operation across an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Utilizes XFET technology with temperature drift curvature correction to minimize nonlinearity
• Capable of sourcing up to 30 mA and sinking up to -20 mA without external components
• Includes a dedicated trim terminal allowing output voltage adjustment over a ±0.5% range
• Operates with minimal supply voltage headroom requirements compared to buried Zener references

Applications

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

Procurement Notes

Verify the specific grade (A or B) required for your application, as initial accuracy and temperature coefficient specifications vary between grades. Confirm that the REEL7 suffix indicates tape and reel packaging suitable for automated assembly processes. Ensure the input voltage provided to the VIN pin remains within the 6.1 V to 18 V operating range to maintain proper regulation and functionality.

Selection Notes

Select this component when a stable 4.096 V reference is needed with moderate load drive capabilities. Consider the A grade if higher initial accuracy is not critical but lower cost is preferred, or the B grade for tighter tolerance requirements. Evaluate the thermal resistance characteristics if significant power dissipation is expected due to high load currents or elevated ambient temperatures.

Part Context

This part belongs to the ADR430/ADR431/ADR433/ADR434/ADR435 family of ultralow noise XFET voltage references. The family shares common architectural features including low noise density, low supply current, and wide operating temperature ranges. Variations exist primarily in the fixed output voltage levels and corresponding minimum input voltage requirements for each model number.

Replacement Considerations

Direct functional replacements within the same family include other models such as ADR430, ADR431, ADR433, and ADR435, provided their respective output voltages match the system design requirements. Verify that any substitute maintains the necessary package type and electrical specifications for line and load regulation.

FAQ

What is the purpose of the COMP pin on the ADR434?

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

Can the ADR434 operate with zero load capacitance?

Yes, the datasheet specifies turn-on settling time measurements with CL = 0 µF, indicating stability without external output capacitors under no-load conditions.