Analog Devices Inc./Maxim Integrated MAX11205AEUB+T

Overview

MAX11205AEUB+T from Maxim Integrated is a 16-bit, single-channel, ultra-low-power delta-sigma ADC optimized for high-dynamic-range sensor measurement in 4–20mA industrial loops. It delivers 120sps output rate, <300µA total active current, and 80dB+ 50/60Hz line-noise rejection using its internal 2.4576MHz oscillator - all in a 10-pin µMAX (FMAX) package.

For engineers reviewing the MAX11205AEUB+T datasheet, MAX11205AEUB+T pinout, MAX11205AEUB+T application, or MAX11205AEUB+T equivalent, key selection criteria include its 2-wire serial interface timing, differential analog/reference inputs, on-demand self-calibration capability, and guaranteed -40°C to +85°C operation with ±2kV ESD protection.

Technical Context

The MAX11205AEUB+T implements a third-order delta-sigma modulator followed by an on-chip SINC4 digital filter, enabling 16-bit noise-free resolution with 720nVRMS typical noise (MAX11205B variant) and 3ppm INL. Its internal clock eliminates external crystal requirements while supporting external clock input at 2.4576MHz for precise timing control.

This device uses fully differential analog inputs (AINP/AINN) and reference inputs (REFP/REFN), supports dual supply rails (AVDD: 2.7–3.6V, DVDD: 1.7–3.6V), and features integrated power-on reset with independent AVDD/DVDD monitoring - ensuring robust startup behavior in industrial environments with supply sequencing variations.

Key Specifications

Pinout & Package

MAX11205AEUB+T is housed in a lead(Pb)-free, RoHS-compliant 10-pin µMAX (FMAX) package - a space-saving 3mm × 3mm surface-mount outline with 0.5mm pitch and exposed pad for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar delta-sigma ADC applications.

Compared with MAX11205BEUB+, the MAX11205AEUB+T trades lower noise for higher throughput and faster response in dynamic sensor systems; versus ADS1220IPWR, it offers simpler 2-wire interface and 75% lower active current at the expense of resolution and integrated analog features.

Availability

MAX11205AEUB+T is available at Aetrix Electronics and suitable for industrial sensor transmitters, portable instrumentation, and battery-powered data loggers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX11205AEUB+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 - emphasizing integration, reliability, and low-power innovation.

The MAX11205AEUB+T belongs to Maxim's ultra-low-power delta-sigma ADC family, engineered specifically for high-accuracy, low-power sensor signal conditioning in resource-constrained industrial and portable systems.

FAQ

What is the maximum sampling rate of the MAX11205AEUB+T?

The MAX11205AEUB+T operates at a fixed output data rate of 120 samples per second (sps), as defined by its MAX11205A variant designation. This rate is determined by the internal 2.4576MHz clock and SINC4 filter configuration - no software or register programming is required to set or adjust it. The MAX11205AEUB+T does not support variable data rates.

Does the MAX11205AEUB+T require external passive components for basic operation?

No, the MAX11205AEUB+T requires no external passive components for core functionality. Its factory-trimmed 2.4576MHz internal oscillator eliminates the need for crystals or resonators. Only two 0.1µF ceramic bypass capacitors - one on AVDD and one on DVDD, placed near their respective pins - are mandatory for stable operation per the datasheet layout guidelines.

How does the 2-wire interface of the MAX11205AEUB+T differ from standard I²C?

The MAX11205AEUB+T uses a proprietary 2-wire interface with SCLK and RDY/DOUT pins - not I²C-compatible. It lacks address bits, ACK/NACK signaling, or bidirectional data lines. Communication is unidirectional (read-only), timing-driven (e.g., 25th SCLK pulse asserts RDY/DOUT high), and requires no pull-up resistors on RDY/DOUT since it functions as an open-drain output with internal weak pull-down during data transfer.

Can the MAX11205AEUB+T perform self-calibration without halting conversions?

No - self-calibration on the MAX11205AEUB+T is an explicit, blocking operation initiated by a 26th SCLK pulse after data read. During calibration, the device suspends new conversions until calibration completes (~208ms for MAX11205A). However, calibration can be scheduled during known idle periods (e.g., between sensor reads in a polling loop) to minimize system-level impact.

What is the absolute input voltage range allowed on AINP and AINN pins of the MAX11205AEUB+T?

The MAX11205AEUB+T specifies an absolute input voltage range of (GND – 30mV) to (VAVDD + 30mV) on both AINP and AINN pins. Exceeding these limits risks latch-up or permanent damage. For proper linear operation, the differential input voltage must stay within ±VREF, and common-mode voltage must remain between GND and VAVDD - verified under all operating conditions including power-up and transient events.