MAX6325ESA+T

Overview

The MAX6325ESA+T is a low-noise, precision voltage reference utilizing buried-zener technology. It provides a fixed 2.5V output with an initial accuracy of ±0.02% and a maximum temperature coefficient of 1ppm/°C. The device operates within an input voltage range of 8V to 36V and supports load regulation for source and sink currents up to 15mA. It features extremely low noise performance, specified at 1.5µVp-p (0.1Hz to 10Hz) and 1.3µVrms (10Hz to 1kHz). Power consumption is approximately 18mW, with a supply current of 3mA. The component is housed in an 8-pin SO package and is rated for operation from -40°C to +85°C.

Feature Summary

• Utilizes buried-zener technology for ultra-low noise performance and high stability.
• Features optional external trimming via the TRIM pin and wideband noise reduction via the NR pin.
• Capable of sourcing and sinking load currents up to 15mA with excellent line and load regulation.
• Stable for all capacitive loads ranging from 0µF to 100µF.

Applications

• High-resolution analog-to-digital and digital-to-analog converters
• High-accuracy industrial and process control systems
• Digital voltmeters and ATE equipment

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when ordering. Confirm that the 'E' grade corresponds to the extended temperature range of -40°C to +85°C. Ensure compatibility with the 8-pin SOIC footprint during PCB layout. Cross-reference the datasheet revision to confirm electrical characteristics match the production batch requirements.

Selection Notes

Select this component for applications requiring high precision and low noise without the power overhead of heated references. The buried-zener architecture ensures superior long-term stability compared to bandgap references. Consider the 15mA drive capability for direct interfacing with ADCs or DACs. Verify that the 8V minimum input voltage aligns with the system's available supply rails.

Part Context

This part belongs to the MAX6325/MAX6341/MAX6350 family of 1ppm/°C voltage references. While the MAX6341 offers 4.096V and the MAX6350 offers 5V outputs, the MAX6325 is specifically configured for 2.5V. All variants share identical pinouts, package options, and core architectural features, differing primarily in their factory-set output voltages and slight variations in noise specifications.

Replacement Considerations

Direct functional substitutes within the same series include the MAX6341ESA+T and MAX6350ESA+T, provided the different fixed output voltages are acceptable for the design.

FAQ

How can the output noise be further reduced?

A 1µF capacitor can be connected between the NR pin and ground to augment wideband noise reduction. Larger capacitance values do not significantly improve noise performance.

Is the device stable with capacitive loads?

Yes, the MAX6325 is stable with capacitive load values ranging from 0µF to 100µF across all load current conditions.

Can the output voltage be adjusted externally?

Yes, the output voltage can be trimmed by connecting a potentiometer between the OUT and GND pins, with the tap connected to the TRIM pin.