Analog Devices Inc./Maxim Integrated MAX11201AEUB+T

Overview

MAX11201AEUB+T from Maxim Integrated is a 24-bit, single-channel, ultra-low-power delta-sigma ADC with 2-wire serial interface, optimized for high-dynamic-range sensor measurement in 4–20mA industrial loops. It delivers 19.1-bit noise-free resolution at 120sps, <320µA total active current, and >100dB 50/60Hz line-noise rejection using its internal 2.4576MHz oscillator and SINC4 digital filter.

For engineers reviewing the MAX11201AEUB+T datasheet, MAX11201AEUB+T pinout, MAX11201AEUB+T application, or MAX11201AEUB+T equivalent, key selection criteria include its 10-pin µMAX package, differential buffered analog inputs, programmable self-calibration, sleep-mode current <0.4µA, and compatibility with low-voltage digital supplies (1.7V–3.6V).

Technical Context

The MAX11201AEUB+T implements a third-order delta-sigma modulator followed by an on-chip SINC4 digital filter, enabling precise low-speed conversion with inherent 50/60Hz rejection. Its internal oscillator is factory-trimmed to 2.4576MHz and requires no external components.

It operates in a true 2-wire mode using only SCLK and RDY/DOUT pins-RDY/DOUT serves dual roles as data-ready flag and serial data output, with timing-controlled calibration and sleep entry via clock pulse counting (25th pulse for idle-high, 26th for self-calibration).

Key Specifications

Pinout & Package

MAX11201AEUB+T is housed in a lead(Pb)-free, RoHS-compliant 10-pin µMAX (FMAX) package-3.0mm × 3.0mm body, 0.5mm pitch, exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution, low-power delta-sigma ADC applications.

Compared with ADS124S08IPW and AD7172-2BRUZ, the MAX11201AEUB+T uniquely balances ultra-low power (<320µA active, <0.4µA sleep), 2-wire simplicity, and 19.1-bit noise-free resolution at 120sps-making it optimal for single-sensor, long-life, space-constrained industrial nodes where I/O count and energy efficiency are primary constraints.

Availability

MAX11201AEUB+T is available at Aetrix Electronics and suitable for RTD temperature monitoring, strain gauge bridge readout, and portable gas sensor interface requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX11201AEUB+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, mixed-signal, and power management ICs for industrial, medical, and communications applications-with emphasis on integration, reliability, and low-power innovation.

The MAX11200 family-including MAX11201AEUB+T-is engineered specifically for ultra-low-power, high-resolution sensor digitization in 4–20mA loops and battery-operated instrumentation, prioritizing noise performance, line-rejection, and minimal external component count.

FAQ

What is the maximum sample rate of the MAX11201AEUB+T?

The MAX11201AEUB+T operates at a fixed output data rate of 120 samples per second (sps), as defined by its MAX11201A variant designation. This rate is set by the internal 2.4576MHz clock and SINC4 filter configuration and cannot be adjusted via software or external timing-ensuring consistent noise performance and 50/60Hz rejection.

Does the MAX11201AEUB+T require external passive components for basic operation?

No, the MAX11201AEUB+T requires no external passive components for core operation: its high-accuracy internal oscillator eliminates the need for crystals or capacitors, and buffered analog inputs remove the requirement for external op-amps or RC filters. Only 0.1µF bypass capacitors on AVDD and DVDD are mandatory for stable power delivery.

How does the 2-wire interface of the MAX11201AEUB+T differ from standard I²C?

The MAX11201AEUB+T uses a proprietary 2-wire interface-not I²C-that relies solely on SCLK and open-drain RDY/DOUT. Unlike I²C, it has no address byte, no ACK/NACK, and no bidirectional data line. Data is always read MSB-first on SCLK rising edges after RDY/DOUT goes low, with timing-based commands (e.g., 25th pulse for idle, 26th for calibration) replacing protocol overhead.

Can the MAX11201AEUB+T perform self-calibration without host processor involvement?

Yes-the MAX11201AEUB+T supports fully autonomous self-calibration triggered by the 26th SCLK pulse after data read. Once initiated, the device executes offset and gain calibration internally, then asserts RDY/DOUT low upon completion. No register writes or firmware routines are needed, making it ideal for simple microcontrollers or state-machine-based systems.

What is the absolute maximum input voltage allowed on AINP and AINN pins of the MAX11201AEUB+T?

The absolute maximum voltage on AINP and AINN is GND – 0.3V to V_AVDD + 0.3V, per the Absolute Maximum Ratings table. For safe operation, the differential input (AINP – AINN) must remain within ±V_REF, and common-mode voltage must stay between GND and V_AVDD. Exceeding these ranges risks permanent damage or measurement inaccuracy.