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Analog Devices Inc./Maxim Integrated MAX11211EEE+
- Part No.:
- MAX11211EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX11211EEE+.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:168
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Product details
Overview
MAX11211EEE+ 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 rejection, and features four SPI-controlled GPIOs for external multiplexer control.
For engineers reviewing the MAX11211EEE+ datasheet, MAX11211EEE+ pinout, MAX11211EEE+ application, or MAX11211EEE+ equivalent, this page provides verified technical context, real-world design implications of its SINC4 filter, buffered analog/reference inputs, internal oscillator accuracy, and GPIO-driven channel selection - all critical for precision low-power sensor interface design.
Technical Context
The MAX11211EEE+ implements a third-order delta-sigma modulator with SINC4 digital filtering, enabling programmable data rates from 0.833sps to 480sps and spectral nulls aligned to 50Hz/60Hz via internal oscillator selection (2.048MHz or 2.4576MHz). Its fully differential analog input (AINP/AINN) and reference (REFP/REFN) support unipolar (0–VREF) or bipolar (±VREF) ranges with optional input buffers to isolate high-impedance transducers.
Calibration is supported at three levels: on-chip self-calibration (200ms), system-level zero/full-scale calibration (100ms each), and user-programmable offset/gain registers (±VREF/4 offset range, 0.5–1.5 gain range). The device uses dual supply rails: AVDD (2.7–3.6V) and DVDD (1.7–3.6V), with independent sleep-mode currents (<0.4µA total) and ESD protection (±2kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit noise-free resolution at 10sps - guarantees no missing codes and full 218 code coverage for high-fidelity sensor digitization. |
| Power Consumption | <300µA total active current (AVDD + DVDD) - enables multi-year operation on coin-cell batteries in portable instrumentation. |
| Line Rejection | >100dB min 50Hz/60Hz rejection at 1–15sps - eliminates mains interference without external notch filters in industrial sensor nodes. |
| Input Structure | Fully differential AINP/AINN and REFP/REFN with optional buffers - supports high-Z sensors (e.g., RTDs, strain gauges) without signal degradation. |
| Interface | 4-wire SPI-compatible serial interface (5MHz SCLK) with RDY/DOUT dual-function pin - simplifies microcontroller integration and reduces GPIO count. |
| Operating Range | -40°C to +85°C ambient temperature - qualified for deployment in harsh industrial environments including process control cabinets. |
| Package | 16-pin QSOP (lead-free/RoHS-compliant) - surface-mount compatible with standard reflow profiles and IPC-7351B footprint. |
Pinout & Package
MAX11211EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for compact PCB layouts in space-constrained sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 16 | GPIO1–GPIO4 | SPI-configurable general-purpose I/Os - drive external analog switches (e.g., MAX313) for multi-channel sensor scanning without MCU intervention. |
| 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–AVDD); buffer enablement reduces input current to 30nA, preserving source accuracy. |
| 7, 8 | AINN / AINP | Fully differential analog inputs - support ±VREF (bipolar) or 0–VREF (unipolar); input buffers reduce dynamic loading to 20nA, enabling direct RTD/thermocouple interfacing. |
| 9 | AVDD | Analog supply (2.7–3.6V) - powers modulator, reference buffer, and analog front-end; separate from DVDD to suppress digital switching noise. |
| 10 | DVDD | Digital supply (1.7–3.6V) - powers SPI interface, GPIO logic, and digital filter; allows low-voltage MCU coexistence (e.g., 1.8V ARM Cortex-M0+). |
| 11 | CS | Active-low chip select - enables multi-device SPI daisy-chaining; must be held low for entire command/data transaction (min 40ns setup/hold). |
| 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 ready flag + SPI data output - asserts low when conversion completes; outputs 24-bit result on SCLK falling edge for glitch-free read timing. |
| 14 | SCLK | Serial clock input - up to 5MHz; controls data shift-in/out timing; duty cycle ≥60% required for reliable operation. |
| 15 | CLK | External clock input - optional 2.048MHz/2.4576MHz/2.25275MHz source for precise line-frequency rejection tuning beyond internal oscillator limits. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable SINC4 digital filter | Configurable data rates (0.833–480sps) with guaranteed >100dB 50/60Hz rejection at ≤15sps - eliminates need for external analog filtering in weigh scale and pressure sensor designs. |
| Independent analog/digital supplies | Separate AVDD (2.7–3.6V) and DVDD (1.7–3.6V) rails - enables mixed-voltage system integration and reduces PSRR sensitivity to digital supply noise. |
| Four configurable GPIOs | Register-controlled outputs supporting break-before-make sequencing - directly manages up to four analog switch channels (e.g., MAX313), reducing MCU GPIO overhead in multi-sensor nodes. |
| On-demand calibration architecture | Three-tier calibration (self/system/user-programmable) with 0.5 LSB offset resolution and 0.5–1.5 gain range - achieves <1ppm INL stability over temperature without factory trimming. |
| High-impedance buffered inputs | Signal and reference buffers reduce input current to 20nA/30nA - preserves accuracy with >1MΩ sensor sources (e.g., pH electrodes, piezoresistive sensors) without external op-amps. |
Applications
| Industrial 4–20mA Loop Sensors | Portable Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Digitizing temperature, pressure, or flow signals in field-mounted transmitters powered by 4–20mA loop current. IC Role / Device Role / Timing Role: Primary ADC capturing slow-varying sensor outputs with ultra-low power consumption and high CMRR to reject loop-induced noise. Use Value: Enables >10-year battery life in wireless HART-enabled devices while maintaining 18-bit resolution and >100dB line rejection without external components. |
Use Scenario: High-precision measurements in handheld multimeters, environmental monitors, or portable gas analyzers. IC Role / Device Role / Timing Role: Core signal acquisition engine with integrated reference and GPIO-controlled multiplexing for multi-parameter sensing. Use Value: Reduces BOM count by eliminating external buffers, reference ICs, and anti-aliasing filters - cuts PCB area by 35% vs. discrete ADC solutions. |
| Weigh Scale Load Cell Interfaces | RTD/Thermistor-Based Temperature Monitoring |
|
Use Scenario: Reading millivolt-level outputs from precision load cells in platform scales and industrial weighing systems. IC Role / Device Role / Timing Role: Delta-sigma ADC with programmable gain and differential inputs performing ratiometric measurement against stable reference. Use Value: Achieves <1µV RMS noise at 10sps and 3ppm INL - resolves sub-gram changes on 100kg platforms without chopper-stabilized amplifiers. |
Use Scenario: Direct digitization of 2-/3-/4-wire RTDs or NTC thermistors in HVAC controllers and medical thermometers. IC Role / Device Role / Timing Role: Precision analog front-end with buffered inputs, internal oscillator, and GPIO-driven excitation switching. Use Value: Eliminates external current sources and op-amp stages - enables ±0.1°C accuracy over -40°C to +85°C with single-chip solution. |
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, 4kSPS max, integrated PGA (1–128), but higher active current (350µA) and no GPIOs. | Better resolution for static measurements; lacks GPIOs for mux control - requires external logic for multi-channel scanning. | Choose ADS124S08IPW when 24-bit resolution is mandatory and GPIO functionality is handled elsewhere in the system. |
| AD7172-2BRUZ | 24-bit resolution, 31.25kSPS, integrated reference, but 3.3V-only DVDD and no GPIOs; consumes 1.2mA active current. | Higher speed and resolution for lab-grade instruments; unsuitable for battery operation due to power draw and lack of sleep-mode optimization. | Choose AD7172-2BRUZ for benchtop equipment where speed and resolution outweigh power constraints. |
Compared with ADS124S08IPW and AD7172-2BRUZ, the MAX11211EEE+ uniquely balances 18-bit precision, <300µA power, integrated GPIOs, and robust 50/60Hz rejection - making it optimal for cost-sensitive, space-constrained, and battery-operated industrial sensor nodes where full 24-bit resolution is unnecessary.
Availability
MAX11211EEE+ is available at Aetrix Electronics and suitable for industrial sensor measurement, portable instrumentation, battery-powered monitoring, and weigh scale applications requiring stable component supply across long product lifecycles.
Supply support for MAX11211EEE+ 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 demanding industrial, medical, and communications applications.
The MAX11211EEE+ belongs to Maxim's ultra-low-power delta-sigma ADC family, engineered specifically for high-dynamic-range sensor digitization in energy-constrained environments like 4–20mA loops and portable test equipment.
FAQ
What is the maximum data rate achievable with the MAX11211EEE+ in continuous conversion mode?
The MAX11211EEE+ supports up to 480sps in continuous conversion mode when 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. Both modes retain full 18-bit noise-free resolution at their respective rates.
Does the MAX11211EEE+ include programmable gain like the MAX11209EEE+?
No, the MAX11211EEE+ does not include digital programmable gain. Gain functionality is exclusive to the MAX11209EEE+, which supports settings from 1 to 128. The MAX11211EEE+ provides fixed-gain operation but retains identical performance in resolution, power, line rejection, GPIO capability, and calibration architecture.
How does the internal oscillator affect 50Hz vs. 60Hz rejection in the MAX11211EEE+?
The MAX11211EEE+ uses the LINEF bit to select between two internal oscillator frequencies: 2.048MHz (LINEF = 1) optimizes 50Hz rejection, and 2.4576MHz (LINEF = 0) optimizes 60Hz rejection. For simultaneous 50Hz/60Hz suppression, an external 2.25275MHz clock applied to the CLK pin ensures ≥80dB rejection at both frequencies.
Can the MAX11211EEE+ operate with different analog and digital supply voltages?
Yes, the MAX11211EEE+ supports independent supply rails: AVDD (2.7–3.6V) for the analog front-end and DVDD (1.7–3.6V) for digital logic and SPI interface. This allows interfacing with low-voltage MCUs (e.g., 1.8V) while maintaining full analog performance - a key advantage for mixed-voltage system design.
What GPIO functionality does the MAX11211EEE+ provide, and how is it controlled?
The MAX11211EEE+ provides four GPIOs (GPIO1–GPIO4) configured via the CTRL2 register using SPI commands. Each GPIO can be set as input or output; as outputs, they drive external analog switches (e.g., MAX313) in break-before-make sequences. Control is fully register-based - no dedicated GPIO pins or secondary interfaces are required.
MAX11211EEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX11211EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11211EEE+ 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+ reliable?
The price and inventory of MAX11211EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11211EEE+ is usually 5 days.
3.What payment methods are accepted for MAX11211EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11211EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11211EEE+?
MAX11211EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11211EEE+ 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+?
For technical support, including MAX11211EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11211EEE+ requirements.
6.How does Aetrix verify that MAX11211EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX11211EEE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX11211EEE+?
All MAX11211EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11211EEE+, 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+ part is unused and in its original packaging.
Return procedure for MAX11211EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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