Analog Devices Inc./Maxim Integrated MAX11209EEE+T

Overview

MAX11209EEE+T from Maxim Integrated is an 18-bit, single-channel, ultra-low-power delta-sigma ADC with digital programmable gain (1–128), four SPI-controlled GPIOs, and integrated input/reference buffers. It delivers 18-bit noise-free resolution at 10sps with 0.55µV_RMS noise, <300µA active current, and >100dB 50/60Hz rejection-optimized for high-precision sensor measurement in 4–20mA industrial loops.

For engineers reviewing the MAX11209EEE+T datasheet, MAX11209EEE+T pinout, MAX11209EEE+T application, or MAX11209EEE+T equivalent, key selection criteria include its programmable gain architecture, buffered high-impedance analog inputs, SINC4 digital filter performance at sub-120sps data rates, and dual-supply operation (2.7–3.6V AVDD, 1.7–3.6V DVDD) enabling battery-powered portable instrumentation.

Technical Context

The MAX11209EEE+T implements a third-order delta-sigma modulator with SINC4 digital filtering, supporting both continuous and zero-latency single-cycle conversion modes. Its internal oscillator operates at 2.4576MHz (LINEF=0) or 2.048MHz (LINEF=1), enabling precise 60Hz or 50Hz line-noise rejection respectively.

It features fully differential analog inputs (AINP/AINN) and reference inputs (REFP/REFN), with optional signal and reference buffers configurable via CTRL1 register bits SIGBUF and REFBUF. The device supports on-demand self-calibration and system-level offset/gain calibration through SPI commands, with user-programmable calibration registers covering ±V_REF/4 offset and 0.5–1.5 gain scaling.

Key Specifications

Pinout & Package

MAX11209EEE+T is housed in a lead(Pb)-free, RoHS-compliant 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), suitable 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 ADC applications.

Compared with ADS124S08IPW and AD7172-2BRUZ, the MAX11209EEE+T uniquely combines 18-bit resolution, <300µA power, programmable gain, and four GPIOs-making it optimal for compact, low-power, single-sensor industrial nodes where board space and energy efficiency are constrained.

Availability

MAX11209EEE+T is available at Aetrix Electronics and suitable for industrial sensor measurement, portable instrumentation, and battery-powered weigh scales requiring stable component supply and long-term lifecycle support.

Supply support for MAX11209EEE+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 and mixed-signal ICs for industrial, medical, and communications applications.

The MAX11209EEE+T belongs to the MAX112xx family of ultra-low-power delta-sigma ADCs engineered specifically for high-dynamic-range sensor digitization in power-constrained industrial and portable systems.

FAQ

What is the maximum data rate supported by the MAX11209EEE+T in single-cycle conversion mode?

The MAX11209EEE+T supports up to 120sps in single-cycle conversion mode when LINEF = 0 (2.4576MHz internal oscillator) and 100sps when LINEF = 1 (2.048MHz oscillator). This zero-latency mode outputs each conversion result immediately without pipeline delay, making it ideal for real-time control loops where timing determinism is critical. The MAX11209EEE+T achieves this while maintaining 18-bit noise-free resolution and <300µA total supply current.

Does the MAX11209EEE+T require external components for its internal oscillator?

No, the MAX11209EEE+T includes a high-accuracy internal oscillator that requires no external components. It operates at either 2.4576MHz (for optimal 60Hz rejection) or 2.048MHz (for optimal 50Hz rejection), selected via the LINEF bit in the CTRL1 register. An external clock can be applied to the CLK pin for custom frequencies-including 2.25275MHz to achieve simultaneous 50Hz/60Hz rejection-but is optional. The MAX11209EEE+T functions fully with internal clock only.

How does the programmable gain feature of the MAX11209EEE+T improve system design?

The MAX11209EEE+T offers digital programmable gain settings of 1, 2, 4, 8, 16, 32, 64, or 128 via the DGAIN_ bits in the CTRL3 register. This allows dynamic range optimization for varying sensor output levels-e.g., selecting gain=64 for low-output RTDs or gain=1 for high-level industrial transducers-without external op-amps or resistor networks. As a result, the MAX11209EEE+T reduces component count, PCB area, and calibration complexity while preserving 18-bit resolution across multiple input ranges.

Can the MAX11209EEE+T interface directly with a 1.8V microcontroller SPI bus?

Yes, the MAX11209EEE+T supports independent DVDD supply from 1.7V to 3.6V, allowing direct SPI interface with 1.8V microcontrollers. Its digital I/Os (SCLK, DIN, CS, RDY/DOUT, GPIO1–GPIO4) meet 1.8V logic thresholds: V_IL ≤ 0.3×DVDD (≤0.54V) and V_IH ≥ 0.7×DVDD (≥1.26V). The MAX11209EEE+T also provides 200mV input hysteresis for noise immunity and drives outputs to 0.9×DVDD (≥1.62V) at 1mA load-ensuring robust communication without level shifters.

What calibration options are available on the MAX11209EEE+T, and how are they initiated?

The MAX11209EEE+T supports three calibration levels: (1) On-chip self-calibration (CAL1=0, CAL0=1, 200ms duration), correcting internal offset/gain; (2) System zero-scale calibration (CAL1=1, CAL0=0, 100ms), using an external zero-input signal; and (3) System full-scale calibration (CAL1=1, CAL0=1, 100ms), using an external full-scale signal. All calibrations are initiated via SPI command byte writes. Calibration registers (SCOC, SCGC, SOC, SGC) store correction values, and the MAX11209EEE+T applies them automatically during conversion-enabling field recalibration without hardware modification.