Analog Devices Inc./Maxim Integrated MAX41400ANL+

Overview

MAX41400ANL+ from Analog Devices is a low-power, zero-drift instrumentation amplifier with programmable gain (10V/V to 200V/V), rail-to-rail CMOS inputs/outputs, and 25µV max input offset voltage over -40°C to +125°C. It operates from 1.7V–3.6V supply, draws just 65µA typical quiescent current, and features internal EMI filters (>100dB EMIRR at 1800/2400MHz) for robust sensor signal conditioning in wearable EKG and RTD temperature sensing systems.

For engineers reviewing the MAX41400ANL+ datasheet, MAX41400ANL+ pinout, MAX41400ANL+ application, or MAX41400ANL+ equivalent, key selection criteria include its WLP-9 package footprint (1.26mm × 1.23mm), on-the-fly gain programming via G0/G1 pins, shutdown mode (0.1µA), and guaranteed performance across automotive temperature range without external gain resistors.

Technical Context

The MAX41400ANL+ implements a three-op-amp instrumentation topology with on-chip trimmed gain-setting resistors, enabling precise, temperature-stable gain selection (10/40/100/200V/V) via two logic-controlled pins (G0, G1). Its zero-drift chopper architecture suppresses 1/f noise and achieves 25µV max V_OS over full temperature range.

It integrates internal EMI filtering networks on IN+/IN− inputs, delivering >100dB rejection at 1800MHz and 2400MHz while maintaining 28kHz –3dB bandwidth at G=10 and 25µV offset stability - critical for low-frequency, high-resolution medical transducer interfaces where RF immunity and DC accuracy are co-constrained.

Key Specifications

Pinout & Package

MAX41400ANL+ is housed in a 9-bump wafer-level package (WLP) measuring 1.26mm × 1.23mm with 0.4mm bump pitch. The package is RoHS-compliant and optimized for space-constrained wearable and implantable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8420ARMZ and LTC6373IMS#PBF, the MAX41400ANL+ uniquely combines ultra-low quiescent current (65µA), on-chip programmable gain (no SPI or external resistors), and integrated EMI filtering in a 1.26mm × 1.23mm WLP - making it the only option meeting simultaneous requirements for miniaturized, battery-operated, RF-resilient medical sensor front-ends.

Availability

MAX41400ANL+ is available at Aetrix Electronics and suitable for wearable EKG monitoring, RTD temperature sensing, and insulin pump sensor interface applications requiring stable component supply across extended production lifecycles.

Supply support for MAX41400ANL+ 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 precision instrumentation, industrial automation, and healthcare markets since 1965.

The MAX41400 series was developed specifically for ultra-low-power, high-accuracy sensor signal conditioning in portable and implantable medical devices - emphasizing zero-drift stability, RF immunity, and minimal board area through wafer-level packaging.

FAQ

What gain options does the MAX41400ANL+ support, and how are they selected?

The MAX41400ANL+ supports four programmable gains: 10V/V, 40V/V, 100V/V, and 200V/V. These are selected by logic states applied to the G0 and G1 pins (GND or VDD), with no external components required. This configuration is specific to the WLP-9 package variant (MAX41400ANL+); the TDFN version offers eight gain options. The internal trimming ensures gain error remains below 0.4% over –40°C to +125°C, making MAX41400ANL+ ideal for uncalibrated medical sensor designs.

Does the MAX41400ANL+ require external components for basic operation?

No, the MAX41400ANL+ requires only a 0.1µF bypass capacitor from VDD to GND for stable operation - all gain-setting resistors, EMI filters, and zero-drift circuitry are fully integrated. Unlike discrete instrumentation amplifier solutions, MAX41400ANL+ eliminates external gain resistors, offset nulling networks, and RF filtering components. This reduces total solution size to under 1.6mm² and removes temperature-dependent drift sources, directly enhancing long-term accuracy in MAX41400ANL+ deployments.

How does the MAX41400ANL+ achieve high EMI rejection without external filters?

The MAX41400ANL+ integrates passive on-die RC filter networks directly at the IN+ and IN− input terminals, providing >100dB rejection at 1800MHz and 2400MHz. These monolithic filters attenuate RF energy before it reaches the sensitive input amplifiers, preventing rectification and DC offset shifts. This capability is verified per IEC 61000-4-3 testing and eliminates the need for external chip ferrites or feedthrough capacitors - a key reliability and space-saving advantage in MAX41400ANL+ medical designs where board area and EMI compliance are critical.

What is the operating temperature range of the MAX41400ANL+, and why is it significant?

The MAX41400ANL+ is specified from –40°C to +125°C, meeting automotive-grade reliability requirements. This extended range ensures consistent 25µV max input offset and 120dB CMRR performance in environments such as under-hood automotive sensors or sterilizable medical devices. Unlike commercial-grade amplifiers, MAX41400ANL+ maintains its zero-drift behavior and gain accuracy across this full span - enabling single-part qualification for both industrial and medical applications without derating or thermal compensation firmware, simplifying MAX41400ANL+ system validation.

Can the MAX41400ANL+ drive an ADC directly, and what output swing can be expected?

Yes, the MAX41400ANL+ features rail-to-rail output capable of swinging to within 25mV of GND and 50mV of VDD when loaded with 10kΩ to VDD/2 - fully compatible with 12- to 16-bit SAR ADCs operating from the same 1.7V–3.6V supply. Its 28kHz bandwidth at G=10 provides adequate settling for sampling rates up to 10kSPS. No external buffer or level shifter is needed, reducing signal chain complexity and preserving SNR. This direct-drive capability is validated across temperature and supply variations in the MAX41400ANL+ datasheet.