MAX873ACSA

Overview

The MAX873ACSA is a precision voltage reference providing a fixed +2.5V output in an 8-pin SOIC package. It features a maximum initial accuracy of ±0.06% and a temperature coefficient of 7ppm/°C over the -40°C to +85°C range. The device operates with a supply voltage from +4.5V to +18V, drawing a typical quiescent current of 340µA. It can source up to 30mA or sink 2mA of load current. Key specifications include low noise (3.8µVP-P at 2.5V) and a dedicated TEMP pin for temperature monitoring.

Feature Summary

• Offers excellent accuracy and very low power consumption suitable for battery-powered systems.
• Features extremely low temperature drift combined with excellent line and load regulation for stable operation.
• Includes a TRIM pin facilitating adjustment of the reference voltage over a ±6% range using a potentiometer.
• Provides a voltage output proportional to temperature on the TEMP pin for compensation circuits.

Applications

• 12-Bit ADCs and DACs
• Digital Multimeters
• Portable Data-Acquisition Systems
• Low-Power Test Equipment

Procurement Notes

Verify the specific suffix 'ACSA' corresponds to the A-grade accuracy (+/- 0.06%) and industrial temperature range (-40°C to +85°C). Confirm the package code S8-4 matches the required 8-SOIC footprint. Ensure the ordering information aligns with the lead-free designation indicated by the '+' symbol if applicable to your bill of materials.

Selection Notes

Select this component when a stable 2.5V reference is required with high initial accuracy and low drift. It is ideal for systems running from a +5V supply due to its guaranteed operation at +4.5V input. Consider the MAX875 or MAX876 if different voltage levels are needed, or the B-grade variants if higher temperature coefficients are acceptable for cost reduction.

Part Context

The MAX873ACSA belongs to the MAX873/MAX875/MAX876 family of low-power, low-drift precision voltage references. These devices utilize a proprietary temperature-coefficient curvature-correction circuit and laser-trimmed thin-film resistors to achieve high performance. The family covers 2.5V, 5V, and 10V outputs, sharing similar architectural features like the TEMP output and TRIM capability.

Replacement Considerations

Direct substitutes within the same family include MAX875ACSA (5V) and MAX876ACSA (10V) for different voltage requirements. For lower accuracy needs, MAX873BCSA is available. Cross-family replacements require matching voltage, package, and accuracy specifications.

FAQ

How can the output voltage be adjusted?

The output voltage can be trimmed over a ±6% range by connecting a resistive divider network, such as a potentiometer, between the OUT, TRIM, and GND pins.

What is the function of the TEMP pin?

The TEMP pin provides an output voltage proportional to the die temperature, which can be used for temperature compensation or warning circuits.

Is an output capacitor required for stability?

No, the device does not require an output capacitor for stability and is stable with capacitive loads up to 100µF.