ADR444BRZ-REEL7

ADR444BRZ-REEL7
Introduction
ADR444BRZ-REEL7 is a high-precision, low-noise voltage reference from Analog Devices, part of the XFET® series. It features an 8-pin SOIC package with tape-and-reel (REEL7) and tube packaging options, designed for extended industrial temperature ranges (-40°C to +125°C). Key specifications include a fixed 4.096V output, 3ppm/°C temperature coefficient, 1.8µVp-p low noise (0.1Hz–10Hz), and 500mV dropout voltage operation, making it ideal for precision data acquisition, medical devices, and industrial control systems.

Key Features

• Ultra-Precision Reference: Initial accuracy of ±0.04% (at 25°C), 3ppm/°C max temperature coefficient for long-term stability.
• Low Noise Design: 1.8µVp-p noise (0.1Hz–10Hz) suitable for high-resolution signal chains.
• Wide Supply Range: Input voltage 4.6V–18V, 3.75mA supply current, supporting 500mV dropout operation.
• Robust Output Drive: 10mA source current, -5mA sink current for demanding load scenarios.
• Compact Packaging: 8-SOIC (5mm×4mm×1.5mm) surface-mount package compatible with automated assembly.
• Flexible Adjustment: Trim pin enables ±0.5% output voltage tuning for design optimization.

Typical Specification Table

Typical Applications

• Precision Instruments: Reference voltage for high-resolution ADCs/DACs in data acquisition systems and medical imaging.
• Industrial Control: Process automation, PLCs, and sensor signal conditioning modules.
• Portable Devices: Battery-powered instruments, handheld diagnostics, and remote monitoring systems.
• Communication Systems: Optical network modules, base station power management, and precision clock generation.
• Test & Measurement: Signal generators, impedance analyzers, and automated test equipment (ATE).

Design & Application Notes

1. Power Filtering: Use 0.1µF ceramic + 10µF tantalum capacitors at VIN for noise suppression.
2. Output Stability: Bypass VOUT with low-ESR capacitors to minimize ripple.
3. Thermal Management: Ensure adequate PCB copper area for heat dissipation in high-temperature environments.
4. Trim Adjustment: Connect precision resistor networks to the Trim pin for ±0.5% output voltage fine-tuning.
5. Compatibility Verification: Validate PSRR and noise compatibility when pairing with Sigma-Delta ADCs/DACs.