ADR443BRZ: Ultra-Precise 3V Voltage Reference IC for Critical Applications

The ADR443BRZ from Analog Devices represents the gold standard in precision voltage references, delivering exceptional 3V output stability for demanding measurement and control systems. As engineers increasingly require higher accuracy in data acquisition and signal processing, this surface-mount IC provides the perfect combination of precision, thermal stability, and noise performance.

In-Depth Technical Specifications

Unmatched Precision Characteristics

With an industry-leading 0.04% initial accuracy (equivalent to just 1.2mV at 3V output), the ADR443BRZ outperforms most competitors in its class. The device's remarkable 3ppm/ C temperature coefficient ensures minimal output drift across the entire -40 C to +125 C operating range, making it ideal for:

• Industrial temperature measurement systems
• Automotive sensor interfaces
• Medical diagnostic equipment
• Precision instrumentation

Noise Performance and Dynamic Behavior

The ADR443BRZ's 1.4 Vp-p noise performance (0.1Hz to 10Hz band) sets new benchmarks for low-noise references. This ultra-clean output enables:

• Higher resolution in 20+ bit ADC systems
• Improved signal-to-noise ratios in sensitive measurements
• Reduced error in precision control loops

With a 10mA output current capability, the device can directly drive multiple loads while maintaining stability.

Power Supply Considerations

The wide 3.5V to 18V input range accommodates various system voltages while consuming only 3.75mA quiescent current. Key power-related features include:

• Stable operation from batteries or regulated supplies
• Excellent line regulation (0.005%/V typical)
• Low dropout operation (500mV typical)

Package and Reliability Features

Mechanical Specifications

The 8-lead SOIC package (3.9mm width) provides:

• Industry-standard footprint for easy integration
• Robust thermal performance
• Compatibility with automated assembly processes

Extended Reliability

Analog Devices' rigorous quality control ensures:

• Long-term output stability < 50ppm/1000hrs
• ESD protection up to 2kV (HBM)
• Moisture sensitivity level (MSL) 1 rating

Design Considerations and Application Circuits

Optimal Layout Practices

For best performance, we recommend:

1. Use a dedicated ground plane under the device
2. Place decoupling capacitors within 5mm of VIN
3. Minimize trace lengths to sensitive analog inputs

Typical Application Circuits

The ADR443BRZ excels in these configurations:

• Precision ADC reference: Directly interfaces with 16-24 bit converters
• DAC voltage anchor: Provides stable full-scale reference
• Sensor excitation: Powers bridge circuits with minimal drift

Comparative Advantages

When benchmarked against competing references, the ADR443BRZ offers:

Parameter	ADR443BRZ	Typical Competitor
Initial Accuracy	0.04%	0.1%
Tempco	3ppm/ C	10ppm/ C
Noise (0.1-10Hz)	1.4 Vp-p	4 Vp-p
Supply Range	3.5-18V	4-15V

Purchasing and Support Resources

Available through authorized distributors worldwide, the ADR443BRZ comes with comprehensive design support:

• Detailed evaluation board (EVAL-ADR443)
• SPICE models for simulation
• Application notes on precision design techniques

For engineers developing next-generation measurement systems, medical devices, or industrial controls, the ADR443BRZ delivers the precision voltage reference performance needed to achieve superior system accuracy and reliability.