ADR435AR-REEL7

Overview

The ADR435AR-REEL7 is a series precision voltage reference from the ADR43x family, manufactured by Analog Devices Inc. It provides a fixed output voltage of 5.0 V with an initial accuracy of ±6 mV (±0.12%) for the A Grade and ±2 mV (±0.04%) for the B Grade. The device features a maximum temperature coefficient of 10 ppm/°C (A Grade) or 3 ppm/°C (B Grade). It operates within a supply voltage range of 7.0 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 high output source current up to +30 mA and sink current up to −20 mA.

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 sourcing up to 30 mA and sinking up to 20 mA of output current.

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 them. Confirm the package type matches your PCB footprint, as the ADR435 series is available in both MSOP and SOIC packages. Ensure the input voltage remains within the specified 7.0 V to 18 V range to maintain proper regulation and stability during operation.

Selection Notes

Select the ADR435AR-REEL7 when a stable 5.0 V reference with low noise and high current drive capability is needed. The REEL7 suffix indicates tape and reel packaging suitable for automated assembly. Consider the A Grade for standard precision needs or the B Grade for tighter accuracy requirements. Ensure the design accounts for the 2 V minimum headroom requirement relative to the output voltage.

Part Context

This component belongs to the ADR43x series of ultralow noise XFET voltage references. The series includes various output voltages such as 2.048 V, 2.5 V, 3 V, 4.096 V, and 4.5 V. The ADR435 specifically targets 5 V system applications where low noise and high current drive are critical. The family is designed to replace buried Zener references while offering lower power consumption and smaller form factors.

Replacement Considerations

ADR435ARZ

FAQ

Does the ADR435 require an external bypass capacitor?

No external capacitor is strictly required for basic operation, but a 0.1 µF capacitor at the output is recommended to help improve noise suppression.

What is the purpose of the COMP pin on the ADR435?

The COMP pin allows for the addition of an external RC network to overcompensate the internal op amp, which can eliminate noise peaking caused by large capacitive loads.