ADR421AR-REEL7

Overview

The ADR421AR-REEL7 is a precision voltage reference from Analog Devices, utilizing second-generation XFET technology. It provides a fixed output of 2.500 V with an initial accuracy of ±0.12% (A Grade) and a temperature coefficient of 10 ppm/°C. The device operates within an input voltage range of 4.5 V to 18 V and draws a maximum quiescent current of 500 µA. It features low noise of 1.75 µV p-p (0.1 Hz to 10 Hz), long-term stability of 50 ppm over 1000 hours, and supports up to 10 mA output current across an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Utilizes patented XFET architecture for superior accuracy and thermal hysteresis compared to standard bandgap references.
• Features a dedicated trim terminal allowing output voltage adjustment over a ±0.5% range without compromising performance.
• Minimizes voltage nonlinearity with temperature through integrated curvature correction techniques.

Applications

• Precision data acquisition systems
• High resolution converters
• Optical network control circuits

Procurement Notes

Verify the specific electrical grade (A or B) required for your application, as parameters like initial accuracy and temperature coefficient vary between grades. Confirm that the SOIC-8 package type matches your PCB footprint requirements. Ensure supply headroom meets the minimum differential voltage specifications under expected load conditions.

Selection Notes

Select this component when low noise and high precision are critical for analog signal chains. Consider the A Grade if tighter initial accuracy and lower temperature coefficients are necessary. Evaluate the need for the TRIM pin functionality if system-level calibration is required to compensate for external circuit errors.

Part Context

This part belongs to the ADR42x series of ultraprecision voltage references, which also includes models with different nominal outputs such as 2.048 V, 3.00 V, and 5.00 V. All members of the series share the same core XFET technology and package options, differing primarily in their factory-set output voltages and associated accuracy grades.

Replacement Considerations

ADR421ARMZ

FAQ

Can the output voltage be adjusted?

Yes, the TRIM pin allows for output voltage adjustment over a ±0.5% range without affecting other performance characteristics.

Is an output capacitor required for stability?

No, the device does not require output capacitors for stability under any load condition, though a small capacitor can help filter noise.