ADR430AR

Overview

The ADR430AR is a precision series voltage reference from Analog Devices, utilizing patented XFET technology to minimize temperature drift curvature. It provides a fixed output of 2.048 V with an operating supply range of 4.1 V to 18 V and requires only 2 V of headroom. The device features low noise (3.5 µV p-p from 0.1 Hz to 10 Hz) and high accuracy, with an initial tolerance of ±3 mV for the A Grade and a maximum temperature coefficient of 10 ppm/°C. It draws a quiescent current of 800 µA and supports source currents up to 30 mA and sink currents up to 20 mA.

Feature Summary

• Utilizes XFET technology for exceptionally low noise and minimized temperature drift nonlinearity
• Provides high output drive capability with +30 mA sourcing and -20 mA sinking
• Includes a dedicated trim terminal for adjusting output voltage within a 0.5% range
• Operates without requiring external capacitors for stability

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 performance metrics such as initial accuracy and temperature coefficient vary between grades. Confirm the package type matches your PCB footprint requirements. Ensure the input voltage remains within the specified 4.1 V to 18 V range during operation. Check for any specific handling precautions related to electrostatic discharge.

Selection Notes

Select this component when low noise and high precision are critical in a system powered by a 5 V rail. The ADR430AR is suitable for applications requiring a stable 2.048 V reference with minimal external components. Consider the A Grade specifications if tighter tolerances are not strictly necessary, or the B Grade for higher precision. Evaluate thermal dissipation if operating at high ambient temperatures or with significant load currents.

Part Context

The ADR430AR belongs to the ADR43x family of ultralow noise XFET voltage references. This family includes variants with different fixed output voltages, such as the ADR431 (2.5 V), ADR433 (3.0 V), ADR434 (4.096 V), and ADR435 (5.0 V). All members share similar architectural benefits, including low power consumption and high drive capability, making them versatile solutions for various precision analog applications.

Replacement Considerations

Direct substitutes within the same family include the ADR430ARMZ (MSOP package) or other ADR43x models if a different voltage level is acceptable. Verify pin compatibility and electrical specifications before substitution.

FAQ

What is the purpose of the COMP pin?

The COMP pin allows for overcompensation of the internal op amp to reduce high-frequency noise peaking when driving large capacitive loads. It should be left unconnected if not used.

Can the output voltage be adjusted?

Yes, the TRIM terminal allows for adjustment of the output voltage over a ±0.5% range without compromising performance.