Analog Devices Inc./Maxim Integrated MAX4462HESA+T

Overview

The MAX4462HESA+T from Maxim Integrated is a precision rail-to-rail output instrumentation amplifier with fixed gain of 100 V/V, reference input (REF) pin for bipolar operation in single-supply systems, ±0.1% gain accuracy, 100 µV typical input offset voltage, and 2.5 MHz gain-bandwidth product. It enables high-accuracy differential voltage amplification in low-power industrial sensor interfaces and battery-powered medical equipment.

For engineers reviewing the MAX4462HESA+T datasheet, MAX4462HESA+T pinout, MAX4462HESA+T application, or MAX4462HESA+T equivalent, key selection criteria include REF-pin–enabled bipolar signal handling, ground-sensing input common-mode range down to VSS − 0.1 V, 1 pA typical input bias current, and guaranteed ±0.1% gain error at +25°C for G = 100 devices.

Technical Context

The MAX4462HESA+T implements Maxim's proprietary indirect current-feedback architecture, converting differential input voltage to current via transconductance stages and using feedback to achieve precision gain control. Its REF pin accepts an external low-impedance reference (0.1 V to VDD − 1.7 V) to set zero-differential-output voltage, enabling true bipolar output swing in single-supply configurations.

This device operates from 2.85 V to 5.25 V single supply or ±2.6 V dual supply (VDD = +2.6 V, VSS = −2.6 V), supports input common-mode range from VSS − 0.1 V to VDD − 1.85 V, and delivers rail-to-rail output with <0.25 mV typical VOL and <4 mV typical VOH (RL = 100 kΩ) at G = 100.

Key Specifications

Pinout & Package

MAX4462HESA+T is housed in an 8-pin SO (Small Outline) package with exposed pad not present (SO variant). Pin 1 is OUT; Pin 2 is VSS (negative supply); Pin 3 is IN+; Pins 4 and 5 are No Connect (not internally connected); Pin 6 is IN−; Pin 7 is VDD (positive supply); Pin 8 is REF (output reference level input).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with AD8429ARMZ and INA128UA, the MAX4462HESA+T uniquely integrates REF-based bipolar operation, ultra-low 1 pA bias current, and 0.8 mA quiescent current in an SO-8 package-making it optimal for space-constrained, battery-sensitive applications requiring factory-calibrated 100× gain without external components.

Availability

MAX4462HESA+T is available at Aetrix Electronics and suitable for industrial process control, precision low-side current sense, and battery-powered medical equipment requiring stable component supply across extended temperature ranges (−40°C to +85°C).

Supply support for MAX4462HESA+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 demanding industrial, medical, and communications applications.

The MAX4462HESA+T belongs to the MAX4460/MAX4461/MAX4462 family of rail-to-rail output instrumentation amplifiers engineered for low-power, high-accuracy differential signal conditioning in single-supply embedded systems.

FAQ

What is the function of the REF pin on the MAX4462HESA+T?

The REF pin on the MAX4462HESA+T sets the output voltage for zero differential input, enabling bipolar output swing (e.g., ±VREF) from a single supply. When REF is connected to VDD/2, the output centers at that voltage-allowing both positive and negative differential inputs to produce corresponding positive and negative output excursions relative to REF. This eliminates the need for external level-shifting circuitry in AC-coupled sensor interfaces.

Does the MAX4462HESA+T support dual-supply operation?

Yes, the MAX4462HESA+T supports dual-supply operation with VDD up to +2.6 V and VSS down to −2.6 V. In this configuration, the REF pin should be connected to ground to establish a 0 V output baseline for zero differential input. The input common-mode range extends from VSS − 0.1 V to VDD − 1.85 V, and the output remains rail-to-rail relative to the dual supplies-enabling true bipolar signal processing without level translation.

What is the maximum capacitive load the MAX4462HESA+T can drive without instability?

The MAX4462HESA+T is stable driving up to 100 pF of capacitive load, as verified in the datasheet's Electrical Characteristics table. Exceeding this value may cause sustained oscillations or degraded settling time. For loads >100 pF (e.g., long traces or ADC input capacitance), a series isolation resistor (10–100 Ω) between OUT and the load is recommended to maintain stability while preserving bandwidth and accuracy.

How does the MAX4462HESA+T achieve ground-sensing capability?

The MAX4462HESA+T achieves ground-sensing capability through its proprietary indirect current-feedback architecture and CMOS input stage, which allows the input common-mode voltage to extend down to VSS − 0.1 V. This enables direct connection to low-side current-sense shunts or grounded transducer outputs without level-shifting circuitry-unlike traditional three-op-amp instrumentation amplifiers constrained to VSS + 1.2 V minimum common-mode.

Is the gain of the MAX4462HESA+T adjustable, or is it fixed?

The gain of the MAX4462HESA+T is fixed at 100 V/V. The "H" suffix in the part number explicitly denotes the factory-trimmed 100× gain variant. Unlike the MAX4460 (adjustable gain) or MAX4461 (fixed gains with shutdown), the MAX4462HESA+T provides no internal or external gain adjustment-its 100× ratio is laser-trimmed during manufacturing to ensure ±0.1% accuracy at +25°C, reducing design complexity and improving thermal stability.