Analog Devices Inc./Maxim Integrated MAX11202BEUB+

Overview

MAX11202BEUB+ from Maxim Integrated is a 24-bit, single-channel, ultra-low-power delta-sigma ADC optimized for high-dynamic-range sensor measurement in battery-powered and 4–20mA loop applications. 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 total active current.

For engineers reviewing the MAX11202BEUB+ datasheet, MAX11202BEUB+ pinout, MAX11202BEUB+ application, or MAX11202BEUB+ equivalent, this page provides verified technical context, validated pin functions, real-world use scenarios in industrial sensing and portable instrumentation, and confirmed alternative options for low-power precision ADC selection.

Technical Context

The MAX11202BEUB+ implements a third-order delta-sigma modulator with SINC4 digital filtering, enabling >80dB 50Hz/60Hz line-noise rejection at its native 13.75sps output rate. Its internal 2.2528MHz oscillator eliminates external timing components and ensures stable conversion timing across -40°C to +85°C.

It features fully differential analog inputs (AINP/AINN) and reference inputs (REFP/REFN), supports on-demand offset/gain self-calibration, and uses a 2-wire serial interface (SCLK + RDY/DOUT) with no separate data-in line-reducing PCB routing complexity in space-constrained designs.

Key Specifications

Pinout & Package

MAX11202BEUB+ is housed in a lead(Pb)-free, RoHS-compliant 10-pin µMAX (FMAX) package - 3mm × 3mm, 0.5mm pitch, exposed pad for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS124S08IPW and AD7172-2BRUZ, the MAX11202BEUB+ uniquely balances sub-µA sleep current, 2-wire simplicity, and 20.5-bit noise-free resolution at 13.75sps-making it irreplaceable for ultra-low-power, space-constrained industrial sensing where every nanoamp and PCB trace matters.

Availability

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

Supply support for MAX11202BEUB+ 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.

The MAX11202 product line delivers ultra-low-power, high-resolution delta-sigma ADCs specifically engineered for battery-operated and loop-powered sensor transmitters demanding maximum dynamic range per microwatt.

FAQ

What is the maximum achievable noise-free resolution of the MAX11202BEUB+ at its specified output data rate?

The MAX11202BEUB+ achieves 20.5-bit noise-free resolution at its native 13.75sps output rate, measured under standard conditions (VAVDD = 3.6V, VDVDD = 1.8V, VREFP – VREFN = VAVDD). This value is guaranteed across the full –40°C to +85°C operating temperature range and reflects the effective number of bits excluding noise-induced uncertainty. The MAX11202BEUB+ does not support higher output rates-its timing and filter response are fixed to this rate.

Does the MAX11202BEUB+ require an external crystal or oscillator to operate?

No, the MAX11202BEUB+ integrates a factory-trimmed 2.2528MHz internal oscillator that requires no external components. This oscillator drives the modulator and digital filter, enabling immediate operation upon power-up. An external clock may be applied to Pin 10 (CLK) to override the internal oscillator-but it is optional and not required for basic functionality.

How does the 2-wire serial interface of the MAX11202BEUB+ differ from standard I²C or SPI protocols?

The MAX11202BEUB+ uses a proprietary 2-wire interface with SCLK and RDY/DOUT only-no separate data-in line. Data is always read-only, MSB-first, two's complement, and clocked on SCLK rising edges. RDY/DOUT serves dual roles: indicating data readiness (low = data valid) and shifting out bits. Unlike I²C or SPI, no address, command, or write cycles are supported-only timing-driven read, sleep, and calibration sequences.

Can the MAX11202BEUB+ perform self-calibration without host processor intervention?

Yes-the MAX11202BEUB+ supports fully autonomous self-calibration triggered solely by SCLK timing. After reading 24 data bits, applying a 26th SCLK pulse initiates offset/gain calibration without any register writes or firmware commands. The device asserts RDY/DOUT low again upon completion, enabling hands-off recalibration during wake-up or periodic maintenance intervals.

What is the absolute maximum rating for analog input voltage on the MAX11202BEUB+?

The absolute maximum analog input voltage for AINP and AINN on the MAX11202BEUB+ is GND – 30mV to VAVDD + 30mV. Exceeding these limits-even momentarily-may cause permanent damage. The functional input range is –VREF to +VREF (bipolar), with VREF defined as VREFP – VREFN and constrained to 1V–VAVDD. Input common-mode voltage must remain between GND and VAVDD.