ADR434ARM-REEL7

Overview

The ADR434ARM-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 with an initial accuracy of ±1.5 mV for the B grade and ±5 mV for the A grade. The device features a maximum temperature coefficient of 3 ppm/°C (B grade) or 10 ppm/°C (A 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 across the operating temperature range of −40°C to +125°C. The component supports sourcing up to 30 mA and sinking up to 20 mA of load current.

Feature Summary

• Utilizes patented XFET technology to minimize voltage change versus temperature nonlinearity.
• Features a dedicated trim terminal allowing output voltage adjustment over a 0.5% range without compromising performance.
• Capable of high output source and sink currents, supporting up to 30 mA source and 20 mA sink loads.

Applications

• Precision data acquisition systems
• High resolution data converters
• Medical instruments

Procurement Notes

Verify the specific grade (A or B) required for your application, as accuracy and temperature coefficient specifications differ between them. Confirm that the system supply voltage remains within the 6.1 V to 18 V operational range to ensure proper regulation. Ensure adequate thermal management is considered if the device is driven near its maximum current limits, as power dissipation increases with load current and input voltage differential.

Selection Notes

Select the ADR434ARM variant when an MSOP-8 package is preferred over the SOIC-8 option. Choose the B grade for applications demanding tighter initial accuracy and lower temperature drift. Consider the ADR434ARZ variant if a narrow SOIC package is required instead. Evaluate the need for external compensation on Pin 7 if driving large capacitive loads to prevent noise peaking.

Part Context

This component belongs to the ADR43x family of ultralow noise XFET voltage references. Unlike buried Zener references that require significant headroom, this series operates with only 2 V of supply voltage headroom, making it suitable for 5 V systems. The family includes various output voltages such as 2.048 V, 2.500 V, and 5.000 V, all sharing similar low-noise and low-drift characteristics.

Replacement Considerations

ADR434ARZ

FAQ

Does the ADR434 require an external bypass capacitor for stability?

No external capacitor is strictly required for circuit stability, though a 0.1 µF capacitor at the output is recommended to improve noise suppression.

How can noise peaking be mitigated when driving large capacitive loads?

An external RC network consisting of an 82 kΩ resistor and a 10 nF capacitor can be added between the COMP pin (Pin 7) and the output (Pin 6) to eliminate noise peaking caused by large capacitive loading.