Analog Devices Inc./Maxim Integrated MAX11206EEE+T

Overview

MAX11206EEE+T from Maxim Integrated is a 20-bit, single-channel, ultra-low-power delta-sigma ADC with digital programmable gain (1–128), four SPI-controlled GPIOs, and fully differential analog/reference inputs. It delivers 20-bit noise-free resolution at 10sps, 570nV_RMS noise, ±3.6V_FS input range, and >100dB 50/60Hz line-noise rejection-optimized for high-precision sensor measurement in 4–20mA industrial loops.

For engineers reviewing the MAX11206EEE+T datasheet, MAX11206EEE+T pinout, MAX11206EEE+T application, or MAX11206EEE+T equivalent, key selection criteria include its 300µA max active current, QSOP-16 package, SPI/QSPI/MICROWIRE interface, on-demand self-calibration, and support for buffered high-impedance transducer sources without dynamic range loss.

Technical Context

The MAX11206EEE+T employs a third-order delta-sigma modulator with SINC4 digital filtering, enabling software-selectable data rates from 0.83 to 480sps and configurable internal oscillator frequencies (2.048MHz or 2.4576MHz) for optimal 50Hz/60Hz rejection. Its dual-mode operation supports both continuous conversion (up to 4× data rate) and zero-latency single-cycle mode.

It integrates independent signal and reference input buffers (enabled via CTRL1 register bits SIGBUF/REFBUF), reducing dynamic input current to 20nA/30nA while maintaining full 20-bit NFR. Calibration architecture includes on-chip offset/gain registers supporting self-, system-, and user-programmed calibration with ±V_REF/4 offset range and 0.5–1.5 gain scaling.

Key Specifications

Pinout & Package

MAX11206EEE+T is housed in a RoHS-compliant, lead(Pb)-free 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for space-constrained industrial PCB layouts.

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 MAX11206EEE+T uniquely combines 20-bit noise-free resolution, integrated programmable gain, four GPIOs for mux control, and sub-300µA power-making it optimal for compact, battery-efficient, multichannel industrial sensor nodes where component count and power budget are critical.

Availability

MAX11206EEE+T is available at Aetrix Electronics and suitable for industrial 4–20mA loop sensors, portable weigh scales, and battery-powered data loggers requiring stable component supply across extended production lifecycles.

Supply support for MAX11206EEE+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.

The MAX11206EEE+T belongs to Maxim's ultra-low-power delta-sigma ADC family, engineered specifically for high-dynamic-range sensor digitization in energy-constrained industrial and portable instrumentation systems.

FAQ

What is the maximum data rate achievable with the MAX11206EEE+T in single-cycle mode?

The MAX11206EEE+T supports up to 120sps in single-cycle conversion mode when configured with LINEF = 0 (2.4576MHz internal oscillator). At this rate, it delivers 20-bit noise-free resolution with zero data latency-ideal for real-time closed-loop control where immediate conversion results are required. The device maintains >100dB 60Hz rejection even at this maximum single-cycle rate.

Does the MAX11206EEE+T require external passive components for basic operation?

No, the MAX11206EEE+T operates without external passive components for core functionality: its high-accuracy internal oscillator eliminates the need for crystals or RC networks, and on-chip digital filtering removes external anti-aliasing requirements. Only standard power-supply decoupling (10µF + 0.1µF per supply) and optional external reference (if not using internal V_REF) are needed-reducing BOM count and board area versus competing ADCs.

How does the programmable gain feature of the MAX11206EEE+T improve system accuracy compared to fixed-gain ADCs?

The MAX11206EEE+T's digital programmable gain (1–128) allows full utilization of the 20-bit dynamic range across varying sensor output levels-e.g., selecting gain=64 for a 15mV thermocouple output yields ~230nV/LSB effective resolution, whereas a fixed-gain 16-bit ADC would waste 4 bits. This eliminates quantization error penalties and avoids external amplifier drift, delivering higher effective ENOB without additional analog components.

Can the MAX11206EEE+T interface directly with high-impedance pH or ion-selective electrodes?

Yes-the MAX11206EEE+T supports optional input buffers on both AINP/AINN and REFP/REFN, reducing analog input current to a constant 20nA (vs. 1.4nA/V unbuffered). This enables stable DC-coupled digitization of >100MΩ electrode sources without gain/offset drift or dynamic range loss, a capability confirmed in Maxim's application note AN6392 for electrochemical sensor interfaces.

What calibration options are available on the MAX11206EEE+T, and how do they impact production test time?

The MAX11206EEE+T provides three calibration levels: (1) 200ms self-calibration (offset + full-scale), (2) 100ms system zero/full-scale calibration using external reference signals, and (3) SPI-programmable offset/gain registers. In production, self-calibration reduces test time by eliminating manual trim adjustments, while system calibration enables end-of-line accuracy validation without specialized equipment-cutting final test duration by ~45% versus uncalibrated ADCs.