ADR443ARZ

Overview

The ADR443ARZ is a precision voltage reference from the ADR44x series, utilizing XFET technology to deliver ultralow noise and high accuracy. It provides a fixed output of 3 V with an initial accuracy of ±0.13% (A grade) or ±0.04% (B grade). The device features a temperature coefficient of 10 ppm/°C for the A grade and 3 ppm/°C for the B grade. It operates within a supply voltage range of 3.5 V to 18 V, requiring only 500 mV of headroom. The unit supports sourcing up to 10 mA and sinking up to -5 mA, with a quiescent current of 3.75 mA.

Feature Summary

• XFET technology minimizes voltage change vs. temperature nonlinearity for superior stability.
• Ultralow noise performance in the 0.1 Hz to 10 Hz frequency band.
• Low dropout operation allowing functionality with minimal supply voltage headroom.
• Integrated trim terminal enables output voltage adjustment without compromising performance.

Applications

• Precision data acquisition systems
• High resolution data converters
• Battery-powered instrumentation
• Portable medical instruments
• Industrial process control systems

Procurement Notes

Verify the specific electrical grade (A or B) required for your application, as accuracy and temperature coefficient specifications differ between grades. Confirm package availability, as the standard part number typically corresponds to the SOIC-8 tube packaging. Ensure input voltage constraints are met relative to the 3 V output to maintain proper regulation and low dropout operation.

Selection Notes

Select the ADR443ARZ when a stable 3 V reference is needed with minimal low-frequency noise. Choose the B grade if tighter initial accuracy and lower temperature drift are critical. Consider the TRIM pin utility for system-level calibration. Evaluate thermal resistance requirements if operating near maximum load currents to manage junction temperature effectively.

Part Context

This component belongs to the ADR44x family of XFET voltage references, which includes models with outputs ranging from 2.048 V to 5.0 V. The family shares common architectural features such as low dropout capability and high output drive strength. The ADR443 variant specifically targets applications requiring a nominal 3 V reference level while maintaining the series' industry-leading noise and drift characteristics.

Replacement Considerations

ADR443BRZ offers higher accuracy (±0.04%) and lower temperature drift (3 ppm/°C) compared to the ADR443ARZ (±0.13%, 10 ppm/°C). Both share identical pinouts and functional characteristics, making them direct pin-compatible alternatives depending on precision requirements.

FAQ

How does the XFET technology improve performance over traditional references?

XFET technology uses extra implanted junction FETs to generate a reference voltage that inherently has lower noise than buried Zener references and requires less correction circuitry than bandgap references, resulting in superior stability and lower drift.

What is the purpose of the TRIM pin?

The TRIM pin allows users to adjust the output voltage over a limited range (typically ±0.5%) by connecting a potentiometer between the output and ground, enabling fine-tuning to compensate for system errors without degrading temperature performance.