Analog Devices Inc./Maxim Integrated MAX11202BEUB+T

Overview

MAX11202BEUB+T from Maxim Integrated is a 24-bit, single-channel, ultra-low-power delta-sigma ADC optimized for high-dynamic-range sensor measurement in 4mA–20mA industrial loops. It delivers 20.5-bit noise-free resolution at 13.75sps, 720nV_RMS noise, ±3ppm INL, and operates from 2.7V–3.6V AVDD with <300µA active current.

For engineers reviewing the MAX11202BEUB+T datasheet, MAX11202BEUB+T pinout, MAX11202BEUB+T application, or MAX11202BEUB+T equivalent, this page provides verified functional identity, validated 10-pin µMAX package mapping, confirmed 2-wire serial interface behavior, calibrated noise and line-rejection performance at 13.75sps, and real-world use cases in RTD temperature and resistive bridge sensing.

Technical Context

The MAX11202BEUB+T implements a 3rd-order delta-sigma modulator followed by an on-chip SINC4 digital filter, delivering 80dB+ 50Hz/60Hz rejection at its rated 13.75sps output rate. Its internal 2.2528MHz oscillator eliminates external timing components and enables fully differential analog and reference inputs with ±V_REF input range.

Power management includes dual POR circuits (AVDD/DVDD), sleep mode (<0.1µA total), and on-demand self-calibration triggered via 26th SCLK pulse. The 2-wire interface uses RDY/DOUT for both data-ready signaling and MSB-first two's complement data output synchronized to SCLK rising edges.

Key Specifications

Pinout & Package

Package: 10-pin µMAX (FMAX) - RoHS-compliant, 3mm × 3mm 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 MAX11202BEUB+T uniquely combines ultra-low 13.75sps throughput, 2-wire simplicity, sub-1µA sleep, and factory-trimmed oscillator-making it optimal for space- and energy-constrained single-sensor nodes where minimal external components are mandatory.

Availability

MAX11202BEUB+T is available at Aetrix Electronics and suitable for RTD temperature sensing, resistive bridge measurement, portable instrumentation, battery-powered weigh scales, and industrial 4–20mA loop applications requiring stable component supply and long-term lifecycle support.

Supply support for MAX11202BEUB+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 systems.

The MAX11202 product line targets ultra-low-power, high-resolution sensor digitization in energy-constrained environments-specifically engineered for 4–20mA loop-powered transmitters and portable instrumentation demanding >20-bit noise-free resolution below 300µA.

FAQ

What is the maximum sample rate supported by the MAX11202BEUB+T?

The MAX11202BEUB+T is the B-version variant and supports a fixed output data rate of 13.75 samples per second. This rate is factory-set and cannot be adjusted via software or configuration registers. It is optimized for high noise rejection and ultra-low power consumption, delivering 20.5-bit noise-free resolution at this rate. The A-version (MAX11202AEUB+T) operates at 120sps.

Does the MAX11202BEUB+T require an external crystal or clock source?

No, the MAX11202BEUB+T does not require an external crystal. It integrates a factory-trimmed 2.2528MHz internal oscillator that serves as the system clock. External clock input (CLK pin) is optional and only needed if synchronous operation with another system clock is required; driving CLK disables the internal oscillator.

How is the 2-wire interface of the MAX11202BEUB+T implemented, and what signals are used?

The MAX11202BEUB+T uses a dedicated 2-wire serial interface consisting of SCLK (serial clock input) and RDY/DOUT (open-drain data-ready/data-output). RDY/DOUT asserts low when conversion data is ready and shifts out 24-bit two's complement data on each SCLK rising edge. No chip-select or data-input line is required, simplifying isolation and reducing pin count.

What is the noise performance of the MAX11202BEUB+T, and under what conditions is it specified?

The MAX11202BEUB+T achieves 720nV_RMS input-referred noise at 13.75sps with V_REF = 2.5V and TA = +25°C. This value is measured across the full 24-bit output word and corresponds to 20.5-bit noise-free resolution. Noise increases slightly at temperature extremes but remains below 1µV_RMS over the full -40°C to +85°C operating range.

Can the MAX11202BEUB+T perform self-calibration, and how is it triggered?

Yes, the MAX11202BEUB+T supports on-demand offset and gain self-calibration. It is triggered by applying a 26th SCLK pulse immediately after reading all 24 bits of conversion data (i.e., after the 25th SCLK pulse pulls RDY/DOUT high). Calibration begins on the falling edge of that 26th SCLK and completes in 256.2ms, after which RDY/DOUT goes low indicating new calibrated data is ready.