Analog Devices Inc./Maxim Integrated MAX41400ANL+T

Overview

MAX41400ANL+T from Analog Devices is a low-power, zero-drift instrumentation amplifier with on-the-fly programmable gain (10V/V, 40V/V, 100V/V, 200V/V) via digital input pins G0/G1, rail-to-rail CMOS inputs/outputs, 25µV max input offset voltage over -40°C to +125°C, and 65µA typical supply current - designed for precision sensor signal conditioning in wearable EKG monitors and portable medical devices.

For engineers reviewing the MAX41400ANL+T datasheet, MAX41400ANL+T pinout, MAX41400ANL+T application, or MAX41400ANL+T equivalent, key selection criteria include its WLP-9 package footprint, internal gain-resistor trimming for <0.4% gain error over temperature, EMI rejection >100dB at 1800/2400MHz, and shutdown mode reducing current to 0.1µA - all critical for battery-powered, high-EMI industrial and medical sensing systems.

Technical Context

The MAX41400ANL+T implements a three-op-amp instrumentation topology with integrated gain-setting resistors trimmed for <5ppm/°C gain drift and 120dB min CMRR at G=100–250. Its zero-drift chopper architecture suppresses 1/f noise and holds input offset voltage ≤25µV max across -40°C to +125°C.

It supports dual-supply (±0.85V to ±1.8V) or single-supply (1.7V–3.6V) operation, features internal EMI filters on IN+/IN−, and uses REF pin for external offset adjustment with <10Ω source impedance requirement - enabling precise DC-coupled transducer interfacing without external calibration.

Key Specifications

Pinout & Package

MAX41400ANL+T is packaged in a 1.26mm × 1.23mm, 9-bump wafer-level package (WLP) with 0.4mm bump pitch - optimized for ultra-compact PCB layouts in implantable and wearable form factors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8420ARMZ and INA333AIDRGT, the MAX41400ANL+T uniquely combines WLP-9 size, on-chip programmable gain, sub-25µV offset, and >100dB cellular-band EMI rejection - making it the only option meeting simultaneous constraints of miniaturization, battery life, and RF robustness in next-gen medical sensors.

Availability

MAX41400ANL+T is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, and wearable health monitors requiring stable component supply across long product lifecycles.

Supply support for MAX41400ANL+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX41400 product line delivers ultra-low-power, zero-drift instrumentation amplifiers optimized for precision DC-coupled sensor interfaces in space-constrained, battery-operated medical and industrial equipment.

FAQ

What is the maximum operating temperature range for the MAX41400ANL+T?

The MAX41400ANL+T is specified over the −40°C to +125°C automotive temperature range, with junction temperature rated up to +150°C. This ensures reliable operation in demanding environments such as under-hood automotive sensors or sterilizable medical housings where sustained high temperatures occur. The device's zero-drift architecture maintains 25µV max input offset voltage across this full range, critical for unattended long-term measurements.

Does the MAX41400ANL+T require external gain-setting resistors?

No, the MAX41400ANL+T does not require external gain-setting resistors. It integrates factory-trimmed precision resistors internally, supporting four programmable gains (10V/V, 40V/V, 100V/V, 200V/V) selected via G0 and G1 logic inputs. This eliminates external component count, board space, and temperature-induced gain drift - delivering <0.4% gain error over −40°C to +125°C without calibration.

How does the MAX41400ANL+T handle electromagnetic interference in wireless medical devices?

The MAX41400ANL+T incorporates internal passive EMI filters on both IN+ and IN− pins, achieving >100dB rejection at 1800MHz and 2400MHz - covering LTE Band 3 and Bluetooth/WiFi bands. This prevents RF rectification and baseline wander in EKG and bioimpedance measurements, eliminating the need for external ferrite beads or RC filters in compact wearable designs.

Can the MAX41400ANL+T be used with a 1.8V supply and 16-bit ADC?

Yes, the MAX41400ANL+T operates down to 1.7V and features rail-to-rail inputs and outputs, enabling full utilization of a 1.8V 16-bit SAR ADC's input range. Its 25µV max input offset and 28kHz bandwidth preserve DC accuracy and signal integrity, while its REF pin allows ratiometric connection - ensuring measurement stability independent of supply or reference voltage drift.

What is the shutdown behavior of the MAX41400ANL+T?

When SHDN_ is pulled low, the MAX41400ANL+T disables internal amplifiers and places the OUT pin in high-impedance state, reducing supply current to 0.1µA typ. Power-up time is 100µs to settle within 90% of final value. This enables aggressive duty-cycling in battery-powered sensors - for example, waking every 100ms to acquire one sample, then returning to shutdown - extending operational life by orders of magnitude.