MAX6126AASA21+

Overview

The MAX6126AASA21+ is a series-mode voltage reference from Analog Devices/Maxim Integrated, housed in an 8-pin SO package. It provides a fixed output of 2.048V with an initial accuracy of ±0.02% and a maximum temperature coefficient of 3ppm/°C over the -40°C to +85°C range. The device operates within a supply voltage range of 2.7V to 12.6V, drawing a typical quiescent current of 380μA. It supports up to 10mA sink/source current capability and features low dropout voltage characteristics.

Feature Summary

• Features curvature-correction circuitry and laser-trimmed thin-film resistors for high precision.
• Provides independent force and sense outputs (OUTF/OUTS) for remote sensing applications.
• Operates with virtually constant supply current regardless of input voltage variations.
• Maintains stability with capacitive loads ranging from 0.1μF to 10μF.

Applications

• High-Resolution A/D and D/A Converters
• ATE Equipment
• Precision Current Sources
• Digital Voltmeters

Procurement Notes

Verify the specific suffix 'A' indicates the A-grade accuracy tier and 'SO' denotes the surface-mount SOIC package. Confirm the '+T' or '+' designation aligns with lead-free/RoHS compliance requirements for your assembly process. Ensure the ordering code matches the exact 2.048V output specification required by the design.

Selection Notes

Select this component when ultra-low noise and high initial accuracy are critical. The A-grade rating ensures tighter tolerances compared to B-grade alternatives. Consider the 8-pin SO package dimensions for PCB layout constraints. Evaluate the need for external noise reduction capacitors on the NR pin if wideband noise performance must be further optimized.

Part Context

This part belongs to the MAX6126 family of ultra-high-precision, ultra-low-noise series voltage references. The family includes various output voltages and packaging options such as μMAX and SO. The MAX6126AASA21+ specifically represents the A-grade accuracy variant in the standard SO package format.

Replacement Considerations

The MAX6126BASA21+ offers similar functionality but with lower accuracy specifications (±0.06% accuracy, 5ppm/°C tempco). Verify if the relaxed tolerance meets system requirements before substituting.

FAQ

How can wideband noise be improved?

Adding a 0.1μF capacitor to the Noise Reduction (NR) pin improves wideband noise performance and AC power-supply rejection.

What is the purpose of the OUTS and GNDS pins?

These pins provide force and sense connections for remote sensing, allowing the cancellation of voltage drops in the lines connecting the reference to the load.