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Analog Devices Inc./Maxim Integrated MAX11209EEE+
- Part No.:
- MAX11209EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX11209EEE+.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:186
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Product details
Overview
MAX11209EEE+ from Maxim Integrated is an 18-bit, single-channel, ultra-low-power delta-sigma ADC with digital programmable gain (1–128), four SPI-controllable GPIOs, and fully differential analog/reference inputs. It delivers 18-bit noise-free resolution at 10sps, <300µA total active current, and >100dB 50Hz/60Hz line-noise rejection-optimized for high-precision sensor measurement in 4–20mA industrial loops.
For engineers reviewing the MAX11209EEE+ datasheet, MAX11209EEE+ pinout, MAX11209EEE+ application, or MAX11209EEE+ equivalent, key selection criteria include its programmable gain capability (exclusive to MAX11209), integrated SINC4 filter for simultaneous 50/60Hz rejection, low-power sleep mode (<0.4µA), and QSOP-16 package compatibility with high-impedance transducer interfaces.
Technical Context
The MAX11209EEE+ employs a third-order delta-sigma modulator with SINC4 digital filtering, enabling software-selectable data rates from 0.833sps to 480sps and configurable internal oscillator frequencies (2.048MHz or 2.4576MHz) via the LINEF bit. Its dual-buffer architecture-separately controllable signal (SIGBUF) and reference (REFBUF) buffers-reduces input current to 20nA/30nA while preserving dynamic range with high-Z sources.
Calibration is supported at three levels: on-chip self-calibration (200ms, ±1µV offset, ±2ppm full-scale), system-level zero/gain calibration (100ms each), and user-programmable offset/gain registers (±VREF/4 offset range, 0.5–1.5 gain scaling). The device operates across –40°C to +85°C with ±2kV HBM ESD protection and RoHS-compliant lead-free QSOP packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit noise-free resolution at 10sps-guarantees no missing codes and stable digitization of low-amplitude sensor signals without dithering. |
| Power Consumption | <300µA total active current (AVDD + DVDD) at 3.6V/1.7V-enables multi-year battery life in portable instrumentation and wireless sensor nodes. |
| Line Rejection | >100dB min 50Hz/60Hz normal-mode rejection at 1–15sps-eliminates mains interference in weigh scales and pressure transmitters without external notch filters. |
| Input Structure | Fully differential AINP/AINN and REFP/REFN with optional buffers-supports bipolar (±VREF) or unipolar (0–VREF) ranges and isolates high-impedance sensors from sampling capacitance. |
| Programmable Gain | Digital gain of 1, 2, 4, 8, 16, 32, 64, or 128 (MAX11209 only)-extends effective dynamic range for microvolt-level thermocouple or strain gauge outputs without external amplifiers. |
| Interface | 4-wire SPI-compatible serial interface with RDY/DOUT dual-function pin-simplifies host MCU integration using standard peripheral drivers and supports QSPI/MICROWIRE protocols. |
| Operating Range | –40°C to +85°C ambient temperature with 2.7–3.6V analog and 1.7–3.6V digital supply-validated for industrial control cabinets and outdoor metering enclosures. |
Pinout & Package
MAX11209EEE+ is housed in a 16-pin QSOP (Quarter-Size Outline Package) with 1.27mm pitch, RoHS-compliant and lead(Pb)-free. The package provides thermal and mechanical stability for precision analog measurement in space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 16 | GPIO1–GPIO4 | Configurable digital I/Os controlled via CTRL2 register-used to drive external multiplexers (e.g., MAX313) for multi-channel sensor scanning without additional logic. |
| 4 | GND | Common analog/digital ground reference-must be star-connected to minimize noise coupling between AVDD and DVDD domains. |
| 5, 6 | REFP / REFN | Differential reference voltage inputs-accept external references (0–VAVDD); buffer enablement reduces input current to 30nA for stable low-drift operation. |
| 7, 8 | AINN / AINP | Fully differential analog input pair-supports buffered/unbuffered modes; enables direct connection to bridge sensors or RTDs without front-end op-amps. |
| 9 | AVDD | Analog supply (2.7–3.6V)-powers modulator, reference circuitry, and input buffers; requires local 10µF + 100nF decoupling for PSRR optimization. |
| 10 | DVDD | Digital supply (1.7–3.6V)-powers SPI interface and GPIO logic; independent rail allows low-voltage MCU interfacing while maintaining analog integrity. |
| 11 | CS | Active-low chip select-initiates SPI frame; must remain asserted for entire 24-bit transaction to prevent register corruption. |
| 12 | DIN | Serial data input-latched on rising edge of SCLK; used for command bytes (e.g., CAL1/CAL0) and register writes (CTRL1–CTRL3). |
| 13 | RDY/DOUT | Open-drain ready flag and data output-goes low when conversion completes; data changes on falling edge of SCLK for reliable read timing. |
| 14 | SCLK | Serial clock input-supports up to 5MHz; duty cycle ≥60% required for valid setup/hold timing per tCH/tCL specs. |
| 15 | CLK | External clock input-optional 2.048MHz/2.4576MHz source for precise line-frequency synchronization; bypasses internal oscillator when EXTCLK = 1. |
Key Features
| Feature | Design Value |
|---|---|
| 18-bit noise-free resolution | Guaranteed 18-bit stable code width at 10sps-enables direct digitization of µV-level signals from load cells and thermopiles without post-processing averaging. |
| Programmable gain (1–128) | Digital gain scaling implemented in post-modulator path-preserves SNR and avoids analog-domain saturation, unlike external PGA solutions. |
| Four SPI-controlled GPIOs | Individually configurable as inputs/outputs via CTRL2 register-replaces discrete logic for analog mux sequencing, reducing BOM count and layout area. |
| SINC4 digital filter | Provides spectral nulls at integer multiples of data rate-delivers >144dB 50/60Hz rejection at 10sps, exceeding EN 61000-4-7 immunity requirements. |
| On-demand self-calibration | 200ms internal zero/full-scale calibration-corrects offset drift and gain error without external calibration equipment or factory programming. |
| High-impedance buffered inputs | Reduces analog input current from 1.4fA/V to 20nA-enables direct connection to >10MΩ piezoresistive sensors without signal degradation. |
Applications
| Industrial 4–20mA Loop Sensors | Portable Weigh Scales |
|---|---|
|
Use Scenario: High-accuracy measurement of RTD, thermocouple, or strain gauge outputs in field-mounted transmitters powered by 4–20mA loop. IC Role / Device Role / Timing Role: Primary sigma-delta ADC digitizing conditioned analog sensor output; internal oscillator eliminates need for external crystal. Use Value: 18-bit NFR and >100dB line rejection ensure stable readings under noisy plant-floor conditions without external filtering components. |
Use Scenario: Battery-powered handheld scale measuring weight via load cell with µV-level output. IC Role / Device Role / Timing Role: Low-power ADC acquiring slow-varying DC signals; GPIOs control channel selection for multi-sensor calibration routines. Use Value: <300µA active current and <0.4µA sleep current extend AA battery life beyond 5 years in standby mode. |
| Pressure Transmitter Front-End | Medical Patient Monitor Analog Input |
|
Use Scenario: Digitizing bridge-based pressure sensor output in hazardous-area certified transmitters. IC Role / Device Role / Timing Role: Precision ADC with differential inputs and programmable gain-configurable for mV/V bridge excitation and ratiometric measurement. Use Value: Programmable gain (up to 128×) resolves sub-µV bridge imbalances, eliminating need for discrete instrumentation amplifiers. |
Use Scenario: Isolated analog acquisition of ECG/EEG biopotentials in portable patient monitors. IC Role / Device Role / Timing Role: Low-noise, low-power ADC with high CMRR (>123dB DC) and selectable data rates for adaptive sampling. Use Value: Fully differential architecture and >100dB 50/60Hz rejection suppress common-mode interference from AC-powered hospital equipment. |
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. | Targets higher-precision applications (e.g., laboratory instruments) where resolution >18-bit is mandatory and power is secondary. | Select MAX11209EEE+ when ultra-low power (<300µA) and GPIO-controlled mux sequencing are required; choose ADS124S08IPW for maximum resolution in non-battery systems. |
| AD7172-2BRUZ | 24-bit, 31.25kSPS, integrated reference, higher PSRR (100dB), but 3.3V-only digital supply and no programmable gain. | Designed for high-speed industrial PLC modules requiring fast settling and multi-channel synchronized sampling. | Choose MAX11209EEE+ for battery-operated, single-channel, low-power sensor nodes; AD7172-2BRUZ suits high-throughput, multi-channel industrial DAQ with fixed-gain front-ends. |
Compared with ADS124S08IPW and AD7172-2BRUZ, the MAX11209EEE+ uniquely balances 18-bit precision, <300µA power, integrated GPIOs, and programmable gain in a QSOP-16 package-making it optimal for cost-sensitive, space-constrained, battery-powered industrial sensors where 24-bit resolution is unnecessary.
Availability
MAX11209EEE+ is available at Aetrix Electronics and suitable for industrial sensor transmitters, portable instrumentation, and battery-powered weigh scales requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX11209EEE+ 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 automotive applications, emphasizing low power, high accuracy, and system-level integration.
The MAX11209EEE+ belongs to Maxim's ultra-low-power delta-sigma ADC family, engineered specifically for high-dynamic-range sensor digitization in energy-constrained industrial control loops and portable measurement devices.
FAQ
What is the maximum data rate achievable with the MAX11209EEE+ in continuous conversion mode?
The MAX11209EEE+ 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 for throughput, requiring three additional 24-bit cycles to settle after an input step. For zero-latency operation, single-cycle mode caps at 120sps.
Does the MAX11209EEE+ require external components for its internal oscillator to function?
No, the MAX11209EEE+ includes a trimmed internal oscillator operating at either 2.4576MHz (LINEF = 0) or 2.048MHz (LINEF = 1), requiring no external crystals or capacitors. This simplifies PCB layout and reduces BOM cost. An external clock can be applied to the CLK pin only if higher frequency accuracy or simultaneous 50/60Hz rejection is needed.
How does the programmable gain feature of the MAX11209EEE+ differ from that of the MAX11211EEE+?
The MAX11209EEE+ includes digital programmable gain (1–128) implemented in the digital filter path, whereas the MAX11211EEE+ lacks this feature entirely. Gain configuration is controlled via DGAIN_[2:0] bits in the CTRL3 register. This makes MAX11209EEE+ suitable for applications requiring dynamic range extension without external PGAs, while MAX11211EEE+ targets fixed-gain, lower-cost implementations.
Can the GPIO pins on the MAX11209EEE+ drive analog switches directly?
Yes-the four GPIOs (GPIO1–GPIO4) on the MAX11209EEE+ are push-pull digital outputs capable of driving logic inputs of analog switches like the MAX313. They are configured via the CTRL2 register and support break-before-make sequencing for clean channel switching, eliminating the need for external GPIO expanders in multi-sensor systems.
What calibration options are available for the MAX11209EEE+, and how long do they take to execute?
The MAX11209EEE+ offers three calibration levels: self-calibration (200ms, corrects internal offset/gain), system zero-scale calibration (100ms, requires external 0V input), and system full-scale calibration (100ms, requires external full-scale voltage). All are initiated via SPI command byte with CAL1/CAL0 bits and store results in dedicated on-chip registers (SCOC, SCGC, SOC, SGC).
MAX11209EEE+ 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:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11209EEE+ FAQ
1.How can I place an order for MAX11209EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11209EEE+ 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 MAX11209EEE+ reliable?
The price and inventory of MAX11209EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11209EEE+ is usually 5 days.
3.What payment methods are accepted for MAX11209EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11209EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11209EEE+?
MAX11209EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11209EEE+ 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 MAX11209EEE+?
For technical support, including MAX11209EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11209EEE+ requirements.
6.How does Aetrix verify that MAX11209EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX11209EEE+ 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 MAX11209EEE+ meets industry standards.
7.What is the process for return or replacement of MAX11209EEE+?
All MAX11209EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11209EEE+, 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 MAX11209EEE+ part is unused and in its original packaging.
Return procedure for MAX11209EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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