MAX9004ESD+T

Overview

The MAX9004ESD+T is a low-power, high-speed single-supply integrated circuit combining an operational amplifier, a comparator, and a precision voltage reference. It operates from +2.5V to +5.5V supplies with typical quiescent current of 375µA at 5V. The op amp offers unity-gain stability with a 1.25MHz gain-bandwidth product. The comparator features 185ns propagation delay and ±2mV built-in hysteresis. An internal 1.230V reference provides ±1% accuracy. The device supports shutdown mode reducing current to 2µA and utilizes SOIC-14 packaging.

Feature Summary

• Integrates a unity-gain stable op amp, fast comparator, and precision reference in a compact package
• Features rail-to-rail outputs for both the amplifier and comparator stages
• Includes internal ±2mV comparator hysteresis to prevent oscillation on slow signals
• Supports shutdown mode for ultra-low power consumption in portable applications

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

Procurement Notes

Verify the specific suffix ESD indicates the SOIC-14 package variant within the MAX9004 family. Confirm availability status as distribution channels may list limited stock or obsolete status for older Maxim Integrated products. Ensure the datasheet revision matches the design requirements for electrical characteristics.

Selection Notes

Select this component when space-constrained designs require combined amplification, comparison, and reference functions. Choose the MAX9004 over the MAX9000 if the shutdown pin is required for power management. Verify that the 1.25MHz bandwidth meets the signal processing speed requirements compared to the decompensated 8MHz variants.

Part Context

This part belongs to the MAX9000 series of mixed-signal ICs designed for battery-powered systems. It consolidates three distinct analog functions into one footprint, reducing board area compared to discrete solutions. The series includes variants with different bandwidths and shutdown capabilities to suit various performance and power profiles.

Replacement Considerations

Official substitutes include other members of the MAX9000 family such as the MAX9000ESA for non-shutdown versions or MAX9001EUB for different package options. Cross-referencing requires matching the functional block configuration and supply voltage range.

FAQ

How does the MAX9004 handle input common-mode voltage near the positive rail?

The amplifier input common-mode voltage extends to within 1.2V of the positive supply, while the comparator extends to within 1.1V.

What is the effect of the internal hysteresis on the comparator output?

The ±2mV built-in hysteresis provides noise immunity and prevents output oscillations even when the input signal changes slowly.