ADR434ARZ

Overview

The ADR434ARZ is a precision series voltage reference from Analog Devices, providing a fixed output of 4.096 V. It operates within an input voltage range of 6.1 V to 18 V and maintains a maximum temperature coefficient of 10 ppm/°C for the A grade. The device features low noise performance with a peak-to-peak value of 6.25 µV in the 0.1 Hz to 10 Hz band. It supports sourcing up to 30 mA and sinking up to -20 mA of load current while consuming approximately 800 µA of quiescent current. The component is housed in an 8-lead SOIC package and functions reliably across an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Utilizes XFET technology to minimize voltage change nonlinearity versus temperature.
• Provides high output drive capability with both source and sink current capacity.
• Includes a dedicated trim terminal for adjusting output voltage without compromising stability.

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 initial accuracy and temperature coefficients vary between versions. Confirm that the input supply voltage remains above the minimum headroom requirement of 2 V relative to the output during operation. Ensure the PCB layout accommodates the 8-lead SOIC footprint and allows for proper thermal dissipation given the operating conditions.

Selection Notes

Select this component when a stable 4.096 V reference is needed with moderate current drive capabilities. Consider the A grade if tighter initial accuracy is not critical but lower cost is preferred, or the B grade for superior drift performance. Evaluate the need for the trim pin if fine-tuning the reference voltage is necessary for system calibration.

Part Context

This part belongs to the ADR43x family of ultralow noise XFET voltage references, which also includes models with outputs of 2.048 V, 2.500 V, 3.000 V, and 5.000 V. All members share similar architectural benefits, including low supply current and high accuracy. The ADR434 specifically targets applications requiring a standard 4.096 V level often used in digital signal processing and ADC/DAC interfaces.

Replacement Considerations

Direct functional replacements within the same package include other members of the ADR43x series such as ADR430, ADR431, ADR433, and ADR435, provided the output voltage matches the design requirements. Verify that any substitute meets the specific line and load regulation specifications of the original circuit.