Analog Devices Inc./Maxim Integrated MAX4462TETT+T

Overview

The MAX4462TETT+T from Maxim Integrated is a precision rail-to-rail output instrumentation amplifier with fixed gain of 10 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 operates from 2.85V to 5.25V single supply or ±2.6V dual supply and is used in strain-gauge amplifiers and precision low-side current sensing.

For engineers reviewing the MAX4462TETT+T datasheet, MAX4462TETT+T pinout, MAX4462TETT+T application, or MAX4462TETT+T equivalent, key selection criteria include REF-pin-enabled bipolar signal handling, factory-trimmed 10× gain, 1 pA typical input bias current, rail-to-rail output swing, and TDFN-EP package compatibility with space-constrained industrial sensor interfaces.

Technical Context

The MAX4462TETT+T implements Maxim's proprietary indirect current-feedback architecture, converting differential input voltage to current via transconductance stages and using feedback to achieve high CMRR and precision gain. Its REF pin establishes the zero-differential-output voltage, enabling true bipolar output swing relative to an external reference.

This architecture supports ground-sensing inputs down to VSS − 0.1 V and delivers 90 dB min CMRR over DC–10 kHz while maintaining 18 nV/√Hz input-referred noise at 10 kHz. The device is specified for operation across −40°C to +85°C with guaranteed 0.15% max gain error at 25°C and 3.0% max over temperature.

Key Specifications

Pinout & Package

MAX4462TETT+T is housed in a 6-pin TDFN-EP (3 mm × 3 mm, 0.75 mm height) with exposed paddle connected to VSS for thermal and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8420ARMZ and INA333AIDRGT, the MAX4462TETT+T uniquely integrates a dedicated REF pin for precise bipolar output centering in compact TDFN packaging-critical for space- and accuracy-constrained portable medical and industrial sensor nodes where external level-shifting circuitry adds cost and error sources.

Availability

MAX4462TETT+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 and long production lifecycles.

Supply support for MAX4462TETT+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 high-performance analog and mixed-signal ICs for industrial, medical, and communications applications.

The MAX4462TETT+T belongs to Maxim's precision instrumentation amplifier family engineered for low-power, high-accuracy sensor signal conditioning in space-constrained, single-supply systems.

FAQ

What is the function of the REF pin on the MAX4462TETT+T?

The REF pin on the MAX4462TETT+T sets the output voltage for zero differential input, enabling true bipolar operation in single-supply systems. When a stable external reference (e.g., 1.65 V on a 3.3 V rail) is applied to REF, the output swings symmetrically around that voltage-e.g., ±1 V for a 100 mV input at G = 10. This eliminates the need for external level-shifting circuitry in applications like ECG or strain-gauge interfaces where AC-coupled signals require both positive and negative excursions.

Does the MAX4462TETT+T support dual-supply operation?

Yes, the MAX4462TETT+T supports dual-supply operation up to ±2.6 V (VDD = +2.6 V, VSS = −2.6 V), with the REF pin typically connected to ground to establish a 0 V output center point. In this configuration, it delivers full rail-to-rail output swing from −2.6 V to +2.6 V for zero-referenced bipolar signals. The device maintains its specified 100 µV offset, 2.5 MHz GBWP, and 1 pA input bias current under dual-supply conditions per the MAX4462 Electrical Characteristics table.

What is the maximum capacitive load the MAX4462TETT+T can drive without instability?

The MAX4462TETT+T is stable driving up to 100 pF capacitive load, as confirmed in the Electrical Characteristics table under "Maximum Capacitive Load." Exceeding 100 pF may cause sustained oscillations or degraded settling time. For loads >100 pF (e.g., long PCB traces or ADC input capacitance), a series isolation resistor (10–50 Ω) between MAX4462TETT+T OUT and the load is recommended to maintain phase margin and ensure 250 µs settling within 0.1% for G = 100.

How does the MAX4462TETT+T achieve ground-sensing capability?

The MAX4462TETT+T achieves ground-sensing capability through its proprietary indirect current-feedback architecture and MOS input stage, allowing the IN+ and IN− inputs to operate down to VSS − 0.1 V. Unlike traditional three-op-amp instrumentation amplifiers, this design enables direct connection to low-side shunt resistors or bridge legs referenced to ground-even when VSS = 0 V-without requiring level-shifting or bootstrapping. This is validated by the "Input Common-Mode Range" specification: VSS − 0.1 V to VDD − 1.7 V.

Is the MAX4462TETT+T pin-compatible with other devices in the MAX446x family?

No, the MAX4462TETT+T is not pin-compatible with MAX4460 or MAX4461 variants. While all share the same 6-pin TDFN-EP footprint, pin functions differ: MAX4462TETT+T uses Pin 2 as VSS and Pin 6 as REF, whereas MAX4461 uses Pin 2 as GND and Pin 6 as SHDN, and MAX4460 uses Pin 2 as GND and Pin 6 as FB. Swapping these devices without PCB revision will result in incorrect biasing, loss of shutdown or gain-setting functionality, and potential damage due to misrouted REF/SHDN/FB signals.