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Analog Devices Inc./Maxim Integrated MAX11211EEE+T
- Part No.:
- MAX11211EEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX11211EEE+T.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,233
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Product details
Overview
MAX11211EEE+T from Maxim Integrated is an 18-bit, single-channel, ultra-low-power delta-sigma ADC optimized for high-dynamic-range sensor measurement in battery-powered and 4–20mA loop systems. It delivers 18-bit noise-free resolution at 10sps, <300µA total operating current, >100dB 50/60Hz line-noise rejection, and features four SPI-controlled GPIOs for external multiplexer control.
For engineers reviewing the MAX11211EEE+T datasheet, MAX11211EEE+T pinout, MAX11211EEE+T application, or MAX11211EEE+T equivalent, this page provides verified technical context, real-world design implications of its SINC4 digital filter, buffered differential input architecture, low-power sleep mode (<0.4µA), and GPIO-driven channel selection - all critical for precision industrial sensor interface design.
Technical Context
The MAX11211EEE+T implements a third-order delta-sigma modulator with SINC4 digital filtering, enabling programmable data rates from 0.83sps to 480sps and configurable 50Hz/60Hz rejection via internal oscillator selection (2.048MHz or 2.4576MHz). Its fully differential analog inputs (AINP/AINN) and reference inputs (REFP/REFN) support both unipolar (0 to VREF) and bipolar (±VREF) operation.
It integrates optional signal and reference input buffers (enabling use with high-impedance transducers), on-demand self- and system calibration (offset/gain), and a high-accuracy internal oscillator requiring no external components. The device operates from separate 2.7–3.6V analog (AVDD) and 1.7–3.6V digital (DVDD) supplies, with ESD protection rated at ±2kV HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit noise-free resolution at 10sps - ensures full 18-bit code stability without dithering in low-noise sensor applications. |
| Power Consumption | <300µA total active current (AVDD + DVDD) - enables multi-year battery life in portable instrumentation and wireless sensors. |
| Line-Noise Rejection | >100dB min at 50/60Hz - eliminates need for external notch filters in industrial environments with AC mains interference. |
| INL Error | ±15ppmFSR max - supports 0.0015% full-scale accuracy for precision weigh scales and calibrated pressure sensors. |
| Input Architecture | Fully differential AINP/AINN and REFP/REFN with optional buffers - isolates switched-capacitor sampling network from high-Z sources, preserving dynamic range. |
| Data Interface | 4-wire SPI-compatible serial interface with RDY/DOUT dual-function pin - simplifies host MCU integration without additional status lines. |
| Operating Temp | -40°C to +85°C - qualified for deployment in industrial control cabinets and outdoor process monitoring equipment. |
Pinout & Package
MAX11211EEE+T is housed in a lead(Pb)-free, RoHS-compliant 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), suitable for automated assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 16 | GPIO1–GPIO4 | SPI-configurable general-purpose I/Os - drive external analog multiplexers (e.g., MAX313) for multi-sensor scanning without MCU GPIO overhead. |
| 4 | GND | Common analog/digital ground reference - requires star-point connection to minimize noise coupling between AVDD and DVDD domains. |
| 5, 6 | REFP / REFN | Differential reference inputs - accept external voltage references (0 to VAVDD); buffer enablement reduces input current to 30nA, critical for precision reference stability. |
| 7, 8 | AINN / AINP | Fully differential analog inputs - support bipolar (±VREF) or unipolar (0–VREF) ranges; input buffers reduce source impedance sensitivity to <1kΩ. |
| 9 | AVDD | Analog supply (2.7–3.6V) - powers modulator, reference buffer, and analog front-end; must be filtered independently from DVDD. |
| 10 | DVDD | Digital supply (1.7–3.6V) - powers SPI interface, GPIO logic, and digital filter; allows level-shifting for 1.8V/3.3V host MCUs. |
| 11 | CS | Active-low chip select - enables multi-device SPI bus sharing; falling edge initiates command/data transfer sequence. |
| 12 | DIN | Serial data input - accepts 8-bit command bytes and register writes on SCLK rising edge; supports configuration of CTRL1–CTRL3 registers. |
| 13 | RDY/DOUT | Open-drain data-ready flag and serial output - RDY = low indicates conversion complete; DOUT shifts MSB-first on SCLK falling edge. |
| 14 | SCLK | Serial clock input - up to 5MHz; timing-critical for DIN setup/hold and RDY/DOUT validity windows per SPI timing table. |
| 15 | CLK | External clock input - optional 2.048MHz/2.4576MHz/2.25275MHz source for precise line-frequency synchronization and enhanced 50/60Hz rejection. |
Key Features
| Feature | Design Value |
|---|---|
| 18-bit noise-free resolution at 10sps | Delivers stable 18-bit codes without missing codes - essential for high-fidelity temperature and strain gauge measurements where LSB integrity is non-negotiable. |
| Programmable SINC4 digital filter | Generates spectral nulls at integer multiples of data rate - enables >144dB 50Hz/60Hz rejection at low data rates without external hardware filtering. |
| Four SPI-controllable GPIOs | Eliminates need for discrete level-shifters or GPIO expanders when driving multichannel analog switches - reduces BOM count and layout complexity. |
| On-demand self- and system calibration | Self-calibration achieves ±1µV offset and ±2ppm full-scale accuracy; system calibration compensates for sensor gain/offset drift over temperature and time. |
| Buffered differential inputs (signal & reference) | Reduces analog input current from 1.4µA/V to 20nA (signal) and 2.1µA/V to 30nA (reference) - preserves accuracy with thermocouples, RTDs, and bridge sensors. |
Applications
| Industrial 4–20mA Loop Transmitters | Portable Precision Weigh Scales |
|---|---|
|
Use Scenario: Digitizing low-level mV outputs from load cells or pressure sensors in field-mounted loop-powered transmitters. IC Role / Device Role / Timing Role: Primary sigma-delta ADC capturing slow-varying analog signals with ultra-low power and high CMRR to reject common-mode noise on long cables. Use Value: Enables 18-bit resolution within strict 3.5mA loop budget via <300µA active current and sleep-mode current <0.4µA during idle intervals. |
Use Scenario: High-accuracy weight measurement in handheld or benchtop scales using strain-gauge bridges. IC Role / Device Role / Timing Role: Precision analog front-end ADC with programmable gain, differential inputs, and on-chip calibration to compensate for sensor nonlinearity and thermal drift. Use Value: Achieves ±0.0015% full-scale linearity (±15ppm INL) and 18-bit noise-free resolution - meets OIML R76 Class III requirements without external amplifiers. |
| Battery-Powered Sensor Nodes | High-Impedance Temperature Sensing |
|
Use Scenario: Multi-sensor environmental monitoring nodes powered by coin-cell batteries or energy harvesters. IC Role / Device Role / Timing Role: Low-power ADC managing multiple RTD or thermistor channels via GPIO-controlled analog mux, minimizing wake-up time and active duty cycle. Use Value: Sleep current <0.4µA extends 10-year battery life; GPIO sequencing enables zero-latency channel switching without MCU intervention. |
Use Scenario: Direct digitization of platinum RTD (PT100/PT1000) or thermistor outputs without external op-amps. IC Role / Device Role / Timing Role: Buffered differential ADC accepting high-impedance sensor sources while maintaining >100dB CMRR and 18-bit ENOB across -40°C to +85°C. Use Value: Input buffers reduce effective source impedance sensitivity, eliminating gain error from sensor lead resistance and enabling 2-/3-/4-wire RTD configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution, low-power delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPW | 24-bit resolution, integrated PGA (1–128), lower max data rate (4ksps), higher active current (~1.3mA) | Better suited for high-gain, wide-dynamic-range applications (e.g., thermocouple with cold-junction compensation); less optimal for ultra-low-power battery use. | Select ADS124S08IPW when 24-bit resolution and on-chip PGA outweigh power budget constraints. |
| AD7172-2BRUZ | 24-bit resolution, faster max data rate (250ksps), higher power (3.2mA active), SPI-only interface (no GPIOs) | Targeted at high-speed precision data acquisition (e.g., PLC analog input modules); lacks GPIOs for mux control and consumes >10× more current. | Select AD7172-2BRUZ when throughput >1ksps and absolute 24-bit accuracy are required, and power is secondary. |
Compared with ADS124S08IPW and AD7172-2BRUZ, the MAX11211EEE+T uniquely balances 18-bit noise-free resolution, sub-300µA active power, integrated GPIOs for sensor multiplexing, and >100dB line-noise rejection - making it the optimal choice for energy-constrained, multi-sensor industrial edge nodes where precision and longevity are co-prioritized.
Availability
MAX11211EEE+T is available at Aetrix Electronics and suitable for industrial 4–20mA transmitters, portable weigh scales, and battery-powered sensor nodes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX11211EEE+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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for industrial, medical, and communications markets.
The MAX112xx family was designed specifically for ultra-low-power, high-resolution sensor digitization in harsh industrial environments - emphasizing line-noise immunity, buffered high-Z input compatibility, and minimal system-level calibration overhead.
FAQ
What is the maximum data rate achievable with MAX11211EEE+T in continuous conversion mode?
The MAX11211EEE+T supports up to 480sps in continuous conversion mode when configured with LINEF = 0 (2.4576MHz internal oscillator) and RATE[2:0] = 111. This mode trades off latency (3-cycle settling) for throughput, whereas single-cycle mode caps at 120sps with zero latency - critical for real-time closed-loop control where deterministic timing matters.
Does MAX11211EEE+T include programmable gain like the MAX11209EEE+T?
No, MAX11211EEE+T does not include digital programmable gain. Unlike the MAX11209EEE+T (which offers gain settings from 1 to 128), the MAX11211EEE+T is a fixed-gain variant optimized for applications where signal conditioning is handled externally or where unity-gain precision is prioritized over flexibility. This simplifies calibration and improves noise performance at base gain.
How does the internal oscillator of MAX11211EEE+T support 50Hz and 60Hz line-noise rejection?
The MAX11211EEE+T's internal oscillator is factory-trimmed to either 2.048MHz (LINEF = 1) for optimal 50Hz rejection or 2.4576MHz (LINEF = 0) for optimal 60Hz rejection. Its SINC4 digital filter places deep nulls at integer multiples of the output data rate - ensuring >100dB attenuation at line frequency when data rates ≤30sps. For simultaneous 50/60Hz suppression, an external 2.25275MHz clock applied to CLK yields ≥80dB at both frequencies.
Can MAX11211EEE+T operate with separate analog and digital supply voltages?
Yes, MAX11211EEE+T supports independent analog (AVDD: 2.7–3.6V) and digital (DVDD: 1.7–3.6V) supplies. This allows interfacing with 1.8V microcontrollers while powering the precision analog front-end from a clean 3.3V rail - reducing digital noise coupling into sensitive analog circuitry and improving PSRR performance beyond 90dB for DVDD and 80dB for AVDD.
What is the purpose of the four GPIOs on MAX11211EEE+T, and how are they controlled?
The four GPIOs (GPIO1–GPIO4) on MAX11211EEE+T are SPI-configurable digital I/Os used primarily to control external analog multiplexers (e.g., MAX313) for multi-sensor scanning. They are programmed via the CTRL2 register: DIRx bits set direction (input/output), and DIOx bits set output state. This enables autonomous channel selection without MCU GPIO usage - reducing firmware complexity and system power during sensor polling cycles.
MAX11211EEE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 480
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11211EEE+T FAQ
1.How can I place an order for MAX11211EEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11211EEE+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX11211EEE+T reliable?
The price and inventory of MAX11211EEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11211EEE+T is usually 5 days.
3.What payment methods are accepted for MAX11211EEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11211EEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11211EEE+T?
MAX11211EEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11211EEE+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX11211EEE+T?
For technical support, including MAX11211EEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11211EEE+T requirements.
6.How does Aetrix verify that MAX11211EEE+T is sourced from the original manufacturer or authorized distributors?
All MAX11211EEE+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX11211EEE+T meets industry standards.
7.What is the process for return or replacement of MAX11211EEE+T?
All MAX11211EEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX11211EEE+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX11211EEE+T part is unused and in its original packaging.
Return procedure for MAX11211EEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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