MAX9001EUB

Overview

The MAX9001EUB is a low-power, high-speed single-supply integrated circuit combining a unity-gain stable operational amplifier, a fast comparator, and a precision voltage reference. It operates from +2.5V to +5.5V supplies with typical quiescent current of 410µA. The op amp offers 1.25MHz gain-bandwidth product and 0.85V/µs slew rate. The comparator features 185ns propagation delay and ±2mV hysteresis. An internal 1.230V reference provides ±1% accuracy. A shutdown mode reduces current to 2µA. It is housed in a 10-pin µMAX package.

Feature Summary

• Integrates a unity-gain stable op amp, a fast comparator, and a precision reference in a compact package
• Features a dedicated shutdown mode that significantly reduces supply current for battery-powered applications
• Provides rail-to-rail output swing for both the amplifier and comparator stages
• Includes built-in comparator hysteresis to ensure noise immunity during signal transitions

Applications

• Single-supply zero-drift photodiode preamplifiers
• Crossing detectors and smart card readers
• Infrared receivers and bar-code readers for remote controls
• Keyless entry systems and sensor signal detection circuits

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm pinout compatibility and package variations. Ensure the selected variant matches the required gain stability and shutdown functionality for the intended design. Cross-reference the datasheet revision date to confirm electrical characteristics align with current production standards.

Selection Notes

Select this component when a combined solution for amplification, comparison, and reference generation is required in a space-constrained environment. The unity-gain stability makes it suitable for direct feedback configurations without external compensation. Consider the shutdown feature if power conservation is critical during idle periods in portable devices.

Part Context

This device belongs to the MAX9000 family of mixed-signal ICs designed for low-voltage analog applications. It consolidates three distinct functional blocks into a single chip, reducing board space and component count. The family includes variants with different gain bandwidths and reference options to suit various speed and precision requirements.

Replacement Considerations

Direct replacements within the same family include the MAX9000EUA, MAX9003EUA, and MAX9004EUB. Verify that substitute parts maintain the same 10-pin µMAX footprint and pin configuration. Ensure the replacement variant supports the necessary shutdown control logic and meets the specific gain-bandwidth requirements of the application.

FAQ

What is the input common-mode voltage range for the op amp?

The input common-mode voltage extends from 150mV below the negative supply to within 1.2V of the positive supply.

How does the shutdown mode affect the outputs?

Activating the shutdown mode puts the outputs into a high-impedance state and reduces the supply current to approximately 2µA.

Is the op amp stable at unity gain?

Yes, the MAX9001 op amp is unity-gain stable with a gain-bandwidth product of 1.25MHz.