ADR431BRMZ-R7

Overview

The ADR431BRMZ-R7 is a precision series voltage reference from Analog Devices, utilizing XFET technology to deliver a fixed output of 2.5 V. It features B-grade initial accuracy of ±0.04% and a maximum temperature coefficient of 3 ppm/°C over the -40°C to +125°C range. The device operates with an input voltage range of 4.5 V to 18 V and draws a typical quiescent current of 800 µA. It provides high output drive capability, sourcing up to 30 mA and sinking up to -20 mA. Low noise performance is specified at 3.5 µV p-p in the 0.1 Hz to 10 Hz band. The component is housed in an 8-lead MSOP package.

Feature Summary

• XFET technology minimizes voltage change versus temperature nonlinearity for low drift performance.
• Capable of sourcing 30 mA and sinking -20 mA without external components.
• Includes a trim terminal allowing output voltage adjustment over a ±0.5% range.
• Operates with minimal supply voltage headroom of 2 V.

Applications

• Precision data acquisition systems
• High resolution data converters
• Medical instruments
• Industrial process control systems

Procurement Notes

Verify the specific suffix R7 indicates reel packaging when ordering. Confirm the B grade designation corresponds to the required 3 ppm/°C temperature coefficient and ±0.04% initial accuracy specifications. Ensure the MSOP-8 package footprint matches the design layout. Check for RoHS compliance status if required by manufacturing standards.

Selection Notes

Select this part for applications requiring low noise and high accuracy in a compact surface-mount package. The 2.5 V output suits single-supply ADCs and DACs. Consider the 30 mA source/sink capability for driving moderate loads directly. Verify that the 4.5 V minimum input voltage meets system requirements compared to lower-voltage alternatives.

Part Context

This component belongs to the ADR43x family of ultralow noise XFET voltage references. The family includes variants with different fixed output voltages such as 2.048 V (ADR430), 3.000 V (ADR433), 4.096 V (ADR434), and 5.000 V (ADR435). All share similar electrical characteristics and pinouts, differing primarily in output voltage and operating input ranges.

Replacement Considerations

Direct substitutes within the same package and specification include ADR431ARMZ and ADR431BRZ. Variants like ADR431ARZ offer A-grade specifications with higher temperature coefficients. Cross-family replacements require verifying pin compatibility and thermal resistance differences between MSOP and SOIC packages.

FAQ

What is the purpose of the COMP pin?

The COMP pin allows connection of a series resistor and capacitor network to the VOUT pin to reduce overall noise performance.

How does the TRIM pin function?

The TRIM pin enables adjustment of the output voltage over a ±0.5% range without compromising reference performance.