MAX6126BASA21+

Overview

The MAX6126BASA21+ is a series-mode voltage reference from Analog Devices/Maxim Integrated, housed in an 8-pin SO package. It provides a fixed output voltage of 2.048V with a maximum initial accuracy of ±0.06%. The device features a maximum temperature coefficient of 5ppm/°C over the -40°C to +85°C range and operates within a supply voltage range of 2.7V to 12.6V. It supports sink/source currents up to 10mA and maintains stability with load capacitances between 0.1μF and 10μF.

Feature Summary

• Features independent force (OUTF) and sense (OUTS) outputs for remote sensing capability to cancel line drops.
• Includes a dedicated noise reduction pin allowing wideband noise improvement via external capacitor connection.
• Operates as a low-dropout series reference with virtually constant supply current independent of input voltage.

Applications

• High-resolution analog-to-digital and digital-to-analog converters
• Precision current sources
• Digital voltmeters
• High-accuracy industrial process control systems

Procurement Notes

Verify the specific suffix 'A' indicates the 8-pin SO package variant distinct from the µMAX version. Confirm the 'B' grade designation aligns with the required ±0.06% accuracy and 5ppm/°C temperature coefficient specifications for your application design constraints.

Selection Notes

Select this component when high precision is required alongside low quiescent current consumption. The series architecture eliminates the need for external resistors found in shunt references. Ensure the PCB layout accommodates the Kelvin connections for OUTF, OUTS, GND, and GNDS pins to maximize regulation performance.

Part Context

This part belongs to the MAX6126 family of ultra-high-precision, ultra-low-noise voltage references. The family utilizes curvature-correction circuitry and laser-trimmed thin-film resistors to achieve superior thermal stability across the automotive temperature range.

Replacement Considerations

The MAX6126AASA21+ serves as a higher-grade alternative offering ±0.02% accuracy and 3ppm/°C temperature coefficient in the same package.

FAQ

How does the noise reduction pin affect performance?

Connecting a 0.1μF capacitor to the NR pin reduces wideband noise and improves AC power-supply rejection without increasing supply current.

What is the purpose of the separate OUTF and OUTS pins?

These pins enable Kelvin connections, allowing the device to regulate the voltage directly at the load by compensating for voltage drops in the connecting traces.