Analog Devices Inc./Maxim Integrated MAX9001ESD+T

Overview

The MAX9001ESD+T from Maxim Integrated is a low-power, single-supply analog IC integrating a unity-gain stable op amp (1.25MHz GBW), an 185ns comparator with ±2mV hysteresis, and a precision 1.230V ±1% reference with 8ppm/°C tempco - all in a 14-pin SO package. It operates from +2.5V to +5.5V, draws 410µA typical supply current, and supports rail-to-rail outputs delivering ±2.5mA (op amp) and ±4.0mA (comparator), enabling use in photodiode preamps, zero-crossing detectors, and smart card readers.

For engineers reviewing the MAX9001ESD+T datasheet, MAX9001ESD+T pinout, MAX9001ESD+T application, or MAX9001ESD+T equivalent, key selection criteria include shutdown functionality (2µA quiescent current), ground-sensing inputs (–0.15V to VDD–1.2V for op amp), capacitive-load stability (250pF op amp / 100nF reference), and internal reference sourcing/sinking capability up to 1mA.

Technical Context

The MAX9001ESD+T implements a monolithic CMOS architecture combining three functional blocks: a unity-gain stable op amp with MOS differential inputs (IBIAS = ±0.05nA typ), a bipolar-input comparator optimized for low propagation delay and glitch-free switching, and a bandgap-based voltage reference with buffered output. All blocks share a common single-supply domain and are designed for coordinated operation - e.g., the comparator's inverting input is internally tied to the reference output.

Its shutdown control (SHDN pin) disables all active circuitry while placing AOUT, COUT, and REF into high-impedance states, preserving signal integrity in battery-powered systems. The op amp maintains no phase reversal under overdriven inputs, and both op amp and comparator feature rail-to-rail output stages capable of <10mV swing margins at ±2.5mA/±4.0mA loads.

Key Specifications

Pinout & Package

MAX9001ESD+T is housed in a 14-pin SO (Small Outline) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, suitable for automated assembly and industrial-grade thermal performance (667mW max dissipation at +70°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar op amp + comparator + reference applications.

Compared with MAX9001EUB+T, the MAX9001ESD+T offers superior thermal performance and easier solder rework due to SO packaging, while MAX9000ESA+ trades shutdown capability for lower unit cost and simpler control logic - making each variant optimal for distinct power, size, and cost constraints.

Availability

MAX9001ESD+T is available at Aetrix Electronics and suitable for photodiode preamps, zero-crossing detectors, and smart card readers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX9001ESD+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, emphasizing low power, high integration, and reliability.

The MAX9000–MAX9005 family was engineered to consolidate op amp, comparator, and reference functions into one die for space- and power-sensitive sensor interface and signal-conditioning applications - reducing system complexity without sacrificing DC accuracy or speed.

FAQ

What is the maximum capacitive load the MAX9001ESD+T op amp output can drive while remaining stable?

The MAX9001ESD+T op amp is specified to remain stable with capacitive loads up to 250pF. This allows direct connection to ADC input capacitors or moderate-length PCB traces without external isolation resistors or compensation networks. Stability is verified under unity-gain conditions with no additional phase margin degradation observed in typical operating ranges.

Does the MAX9001ESD+T require external components to use its internal reference for comparator thresholding?

No, the MAX9001ESD+T does not require external components to use its internal reference for comparator thresholding. Its CIN− pin is internally connected to the REF output, enabling immediate fixed-threshold comparison against CIN+ without resistors or dividers - simplifying zero-crossing and level-detection circuits.

How does the shutdown mode affect the output states of the MAX9001ESD+T?

In shutdown mode (SHDN ≤ 0.3×VDD), the MAX9001ESD+T places AOUT, COUT, and REF into high-impedance states while reducing supply current to 2µA. This preserves signal integrity on shared buses and prevents loading of downstream circuits - critical for multiplexed sensor systems and battery-backed applications.

What is the input common-mode voltage range for the op amp section of the MAX9001ESD+T?

The op amp input common-mode voltage range for the MAX9001ESD+T is specified from –0.15V below VSS to VDD – 1.2V. This ground-sensing capability enables direct interfacing with 0V-referenced transducers like photodiodes and RTDs without external bias networks - maintaining accuracy across the full supply range.

Can the MAX9001ESD+T reference output source and sink current simultaneously?

No, the MAX9001ESD+T reference output cannot source and sink current simultaneously. It is designed to either source up to 1mA (when VREF > load voltage) or sink up to 1mA (when VREF < load voltage), with guaranteed load regulation of ±0.6mV/mA in sourcing and ±2.0mV/mA in sinking modes - supporting unidirectional biasing of comparators or ADC references.