ADR434AR

Overview

The ADR434AR is a precision voltage reference from the ADR43x series, utilizing XFET technology to minimize temperature drift curvature. It provides a nominal output of 4.096 V with an initial accuracy of ±5 mV (±0.12%) for the A Grade and ±1.5 mV (±0.04%) for the B Grade. The device operates within a supply voltage range of 6.1 V to 18 V, requiring only 2 V of headroom. Key electrical parameters include a maximum temperature coefficient of 10 ppm/°C (A Grade) or 3 ppm/°C (B Grade), quiescent current of 800 µA, and high output drive capability sourcing up to 30 mA and sinking up to 20 mA.

Feature Summary

• XFET technology minimizes voltage change vs. temperature nonlinearity
• Capable of sourcing 30 mA and sinking 20 mA without external components
• Includes a trim terminal for adjusting output voltage over a 0.5% range
• Operates with low supply voltage headroom of 2 V

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 accuracy and temperature coefficients differ between them. Confirm the package type matches your PCB footprint, as the series is available in both MSOP-8 and SOIC-8 configurations. Ensure the input voltage meets the minimum requirement of 6.1 V for proper regulation. Check for any specific ordering suffixes that may indicate reel packaging versus tube packaging if applicable.

Selection Notes

Select the ADR434AR when a 4.096 V reference is needed with low noise and high current drive capabilities. Choose the A Grade for standard precision applications or the B Grade for tighter accuracy requirements. Consider the thermal resistance values provided in the datasheet if operating at higher load currents to ensure junction temperatures remain within safe limits. Verify that the system does not require large capacitive loads that might necessitate compensation via the COMP pin.

Part Context

The ADR434AR belongs to the ADR43x family of ultralow noise XFET voltage references manufactured by Analog Devices. This family includes variants with different output voltages such as 2.048 V, 2.500 V, 3.000 V, 5.000 V, and 4.500 V. All members share similar architectural features, including low quiescent current and wide operating temperature ranges from -40°C to +125°C.

Replacement Considerations

Direct replacements within the same family include the ADR434ARMZ (MSOP-8 package) and ADR434BRZ (SOIC-8 package, B Grade). Other models like ADR430, ADR431, ADR433, ADR435, and ADR439 offer different output voltages but share the same functional characteristics.