Analog Devices Inc./Maxim Integrated MAX9000ESA

Overview

MAX9000ESA 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 an 8-pin SO package. It operates from +2.5V to +5.5V, draws 410µA typical supply current, supports rail-to-rail outputs (±2.5mA op amp / ±4.0mA comparator), and targets zero-crossing detection and photodiode preamplification in battery-powered instrumentation.

For engineers reviewing the MAX9000ESA datasheet, MAX9000ESA pinout, MAX9000ESA application, or MAX9000ESA equivalent, key selection criteria include its integrated reference accuracy, comparator propagation delay under 200ns, op amp stability with 250pF capacitive loads, and absence of phase reversal during overdrive - critical for reliable signal conditioning in smart card readers and infrared receivers.

Technical Context

The MAX9000ESA implements a monolithic CMOS/MOSFET hybrid architecture: its op amp uses MOS differential inputs for ultra-low bias current (±0.05nA typ) and a CMOS output stage enabling rail-to-rail swing within 2mV of rails; the comparator employs bipolar differential inputs with ground-sensing capability (VCM down to VSS − 0.15V) and proprietary output switching to suppress supply glitches.

Unlike the shutdown-capable MAX9001/MAX9004, the MAX9000ESA lacks SHDN functionality and fixed internal reference connection - its CIN− is internally tied to REF, forming a dedicated zero-crossing detector topology. The reference is buffered, stable with up to 100nF load capacitance, and exhibits only ±60µV line regulation over 3V supply change.

Key Specifications

Pinout & Package

MAX9000ESA is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm, with standard 1.27mm pitch and gull-wing leads. Thermal resistance θJA = 125°C/W; rated for −40°C to +85°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX9003ESA, the MAX9000ESA offers guaranteed unity-gain stability and lower propagation delay for precision thresholding; versus TLV2304IDR, it delivers tighter reference accuracy, reduced component count, and superior noise immunity via integrated hysteresis - directly lowering system-level validation effort.

Availability

MAX9000ESA is available at Aetrix Electronics and suitable for photodiode preamplification, zero-crossing detection, and smart card reader signal conditioning requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX9000ESA 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 power, sensing, and interface applications, with emphasis on integration, low power, and rugged performance.

The MAX9000–MAX9005 family was engineered to consolidate op amp, comparator, and reference functions into minimal-footprint packages for portable and space-constrained instrumentation - reducing bill-of-materials and layout complexity without sacrificing accuracy or speed.

FAQ

What is the maximum capacitive load the MAX9000ESA op amp can drive while remaining stable?

The MAX9000ESA op amp is specified stable with capacitive loads up to 250pF, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (TOC25). This allows direct connection to ADC input sampling capacitors or long PCB traces without external isolation resistors. Exceeding 250pF may cause peaking or oscillation, especially at higher gains.

Does the MAX9000ESA include a shutdown feature?

No, the MAX9000ESA does not include a shutdown feature. Shutdown functionality is exclusive to the MAX9001 and MAX9004 variants (pin 2 in µMAX, pin 3 in SO). The MAX9000ESA has no SHDN pin and operates continuously whenever powered - its 410µA typical supply current reflects this always-on design.

How is the comparator's inverting input connected in the MAX9000ESA?

In the MAX9000ESA, the comparator's inverting input (CIN−) is internally connected to the internal 1.230V reference output (REF). This fixed connection configures the device as a dedicated zero-crossing detector where CIN+ accepts the external signal and the threshold is precisely set by the on-chip reference - no external resistor network is needed.

What is the input offset voltage specification for the MAX9000ESA op amp over temperature?

The MAX9000ESA op amp has a maximum input offset voltage of ±1.5mV over the full −40°C to +85°C operating range, with a temperature coefficient of ±1µV/°C. This tight TCVOS ensures minimal drift in precision DC-coupled applications such as sensor signal conditioning, where baseline stability is critical across environmental conditions.

Can the MAX9000ESA reference output drive a 100nF capacitor?

Yes, the MAX9000ESA internal reference is explicitly characterized for stability with capacitive loads up to 100nF, as stated in the "Voltage Reference" section and Electrical Characteristics table. This enables direct decoupling of the reference node or driving of high-capacitance ADC reference inputs without external buffering or series resistance.