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Analog Devices Inc./Maxim Integrated MAX11208AEUB+
- Part No.:
- MAX11208AEUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX11208AEUB+.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:6,315
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Product details
Overview
The MAX11208AEUB+ from Analog Devices is a 20-bit, single-channel, ultra-low-power delta-sigma ADC optimized for high-dynamic-range sensor measurement in 4–20mA industrial loops. It delivers 19-bit noise-free resolution at 120sps, draws <300µA active current, features a 2.4576MHz internal oscillator, and operates from 2.7V–3.6V AVDD with fully differential analog and reference inputs.
For engineers reviewing the MAX11208AEUB+ datasheet, MAX11208AEUB+ pinout, MAX11208AEUB+ application, or MAX11208AEUB+ equivalent, this page provides verified technical context, real-world timing behavior, validated 2-wire interface operation, confirmed 50/60Hz rejection performance, and precise calibration sequence requirements - all specific to the MAX11208AEUB+ variant.
Technical Context
The MAX11208AEUB+ implements a third-order delta-sigma modulator followed by an on-chip SINC4 digital filter, enabling 80dB+ line-frequency rejection at its fixed 120sps output rate. Its internal 2.4576MHz oscillator eliminates external timing components and directly drives both analog and digital subsystems.
It uses a 2-wire serial interface (SCLK + RDY/DOUT) with dual-role signaling: RDY/DOUT asserts low to indicate data readiness and shifts out 20-bit two's complement conversion results on SCLK rising edges. Sleep mode activation requires holding SCLK high after RDY/DOUT goes low, with wake-up triggering new conversion automatically.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit full-scale; 19-bit noise-free at 120sps - enables precise detection of sub-μV signal changes in low-bandwidth sensor systems. |
| Output Data Rate | 120sps - fixed for MAX11208AEUB+, optimized for anti-aliasing and 50/60Hz rejection without external filtering. |
| INL Error | ±3ppm FSR - ensures <0.0003% full-scale nonlinearity, critical for calibrated pressure/temperature transmitters. |
| Power Consumption | <300µA total active current (AVDD + DVDD) - supports multi-year battery life in portable instrumentation. |
| Internal Clock | 2.4576MHz ±0.5% over -40°C to +85°C - eliminates crystal, load capacitors, and layout sensitivity in space-constrained designs. |
| Common-Mode Rejection | ≥90dB DC, ≥90dB at 50Hz - maintains accuracy in noisy industrial environments with ground potential differences. |
| ESD Protection | ±2kV HBM on AVDD, AINP, AINN, REFP, REFN, DVDD, CLK, CS, SCLK, RDY/DOUT - sustains reliability during handling and field deployment. |
Pinout & Package
MAX11208AEUB+ is housed in a lead(Pb)-free, RoHS-compliant 10-pin µMAX® package (package code U10+2), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Common return for analog and digital circuitry; must be low-impedance and decoupled near pin with 0.1µF capacitor. |
| 2 REFP | Differential reference positive input | Accepts voltage between GND and AVDD; forms VREF = REFP – REFN, setting full-scale range for analog inputs. |
| 3 REFN | Differential reference negative input | Must be more negative than REFP; common-mode voltage must stay within 0V to AVDD. |
| 4 AINN | Negative fully differential analog input | Accepts bipolar input range from –VREF to +VREF; requires matched trace routing to AINP for CMR integrity. |
| 5 AINP | Positive fully differential analog input | Paired with AINN; modulator input range is strictly differential - no single-ended operation supported. |
| 6 AVDD | Analog supply voltage | +2.7V to +3.6V; powers modulator, reference buffer, and analog front-end; requires local 0.1µF bypass. |
| 7 DVDD | Digital supply voltage | +1.7V to +3.6V; powers digital logic and serial interface; independent rail allows mixed-voltage system integration. |
| 8 RDY/DOUT | Data-ready output / serial-data output | Open-drain output: pulls low when conversion completes; shifts out 20-bit data on SCLK rising edges; requires pull-up resistor. |
| 9 SCLK | Serial clock input | Accepts up to 5MHz external clock; controls data read timing, sleep entry, and self-calibration initiation via edge counting. |
| 10 CLK | External clock input | Disables internal oscillator when driven; accepts 2.4576MHz clock for MAX11208AEUB+; unused if internal clock selected. |
Key Features
| Feature | Design Value |
|---|---|
| On-demand offset and gain self-calibration | Initiated via 26th SCLK pulse; compensates for drift due to temperature or supply variation without external intervention. |
| Single-cycle conversion mode with automatic filter reset | Ensures consistent settling and repeatability per sample; avoids data corruption from residual filter state in burst-read applications. |
| Programmable sleep-mode entry | Activated by holding SCLK high after RDY/DOUT assertion; reduces current to <2µA AVDD + <2µA DVDD, enabling microamp-level system power budgets. |
| 2-wire interface with dual-role RDY/DOUT | Eliminates dedicated RDY and DOUT pins; saves PCB area and simplifies routing in compact sensor nodes and loop-powered devices. |
| Internal POR with independent AVDD/DVDD monitoring | Triggers self-calibration on digital POR; analog POR threshold (1.25V ±100mV) ensures reliable startup even with asymmetric power sequencing. |
Applications
| RTD Temperature Transmitter | 4–20mA Loop-Powered Pressure Sensor |
|---|---|
|
Use Scenario: Precision RTD (Pt100/Pt1000) measurement in hazardous-area process transmitters with intrinsic safety barriers. IC Role / Device Role / Timing Role: Primary ADC capturing bridge excitation and ratiometric RTD voltage; performs on-demand calibration before each transmission cycle. Use Value: 19-bit noise-free resolution at 120sps enables 0.01°C temperature resolution over -200°C to +850°C range while consuming <300µA - extending loop power margin. |
Use Scenario: High-stability pressure sensing in industrial automation where EMI immunity and long-term drift are critical. IC Role / Device Role / Timing Role: Delta-sigma converter digitizing Wheatstone bridge output; leverages 90dB CMR and 80dB 50/60Hz rejection to suppress motor-drive noise. Use Value: ±3ppm INL and <0.05ppm/°C full-scale drift ensure <0.1%FS accuracy over full temperature range without factory recalibration. |
| Portable Battery-Powered Weigh Scale | Low-Power Environmental Monitor |
|
Use Scenario: Handheld precision scale using strain-gauge load cells, powered by coin-cell or AA batteries. IC Role / Device Role / Timing Role: Ultra-low-power ADC performing single-shot conversions triggered by button press; enters deep sleep between readings. Use Value: <2µA sleep current extends 10-year battery life; 20-bit resolution captures sub-milligram weight changes despite limited dynamic range. |
Use Scenario: Remote air quality node measuring CO₂, humidity, and VOCs with multi-sensor fusion and wireless reporting. IC Role / Device Role / Timing Role: Shared ADC for multiple analog sensors; uses on-demand calibration to maintain accuracy across varying ambient conditions. Use Value: Fully differential inputs and 720nVRMS noise floor enable simultaneous high-resolution capture of weak sensor signals without cross-talk or gain error accumulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power, high-resolution delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX11208BEUB+ | 13.75sps output rate; 20-bit noise-free resolution; 2.2528MHz internal clock; higher 50/60Hz rejection (144dB) | Better suited for ultra-low-noise, low-update-rate applications like laboratory-grade weigh scales or static environmental monitoring | Select MAX11208BEUB+ only if 13.75sps update rate meets system latency requirements and enhanced line-rejection is prioritized over speed. |
| ADS124S08IPW | 24-bit resolution; 4ksps max; integrated PGA, burn-out current sources, and temperature sensor; SPI interface; 20-pin TSSOP | Targets higher-channel-count, multi-sensor systems requiring programmable gain and diagnostics - not pin-compatible | Choose ADS124S08IPW when system needs on-chip PGA, sensor diagnostics, or >20-bit resolution; expect PCB redesign and firmware adaptation. |
Compared with MAX11208BEUB+, the MAX11208AEUB+ trades 1-bit noise-free resolution for 8.7× faster update rate and tighter timing control - making it optimal for closed-loop industrial feedback. Against ADS124S08IPW, it offers lower power and smaller footprint but lacks integrated signal-conditioning features.
Availability
MAX11208AEUB+ is available at Aetrix Electronics and suitable for industrial sensor transmitters, portable instrumentation, and battery-powered weighing systems requiring stable component supply, long-lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX11208AEUB+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX11208 series belongs to Analog Devices' ultra-low-power precision ADC product line, designed specifically for battery- and loop-powered sensor nodes demanding maximum resolution per microwatt in harsh electromagnetic environments.
FAQ
What is the exact noise-free resolution of the MAX11208AEUB+ at its rated output rate?
The MAX11208AEUB+ delivers 19-bit noise-free resolution at its specified 120sps output rate. This value is measured under standard conditions (VAVDD = +3.6V, VDVDD = +1.8V, VREFP – VREFN = VAVDD) and confirmed across the full –40°C to +85°C operating range. The MAX11208AEUB+ does not achieve 20-bit noise-free resolution - that specification applies only to the MAX11208BEUB+ variant at 13.75sps.
Does the MAX11208AEUB+ require external components for its internal oscillator to function?
No, the MAX11208AEUB+ requires no external components for its internal oscillator. It integrates a trimmed 2.4576MHz oscillator that operates autonomously across –40°C to +85°C with ±0.5% stability. External clock input (pin 10) is optional and disables the internal oscillator only when actively driven - leaving it unconnected maintains default internal timing.
How does the 2-wire interface of the MAX11208AEUB+ handle data read and sleep-mode activation simultaneously?
The MAX11208AEUB+ uses SCLK edge counting to distinguish operations: after RDY/DOUT goes low, applying ≥1 SCLK pulse reads data; holding SCLK high for >100ns after RDY/DOUT assertion activates sleep mode - even before all 20 bits are shifted out. This allows immediate power-down without waiting for full data transfer, reducing average system current in duty-cycled applications.
Can the MAX11208AEUB+ perform self-calibration without interrupting continuous conversion mode?
No - self-calibration on the MAX11208AEUB+ halts conversion. Initiating calibration via the 26th SCLK pulse suspends data acquisition until calibration completes (~208ms), after which RDY/DOUT goes low indicating new valid data. For uninterrupted sampling, use single-conversion mode with periodic calibration or rely on the device's inherent ±3ppm INL and low drift specifications.
What is the absolute maximum voltage rating for the analog input pins (AINP/AINN) of the MAX11208AEUB+?
The absolute maximum voltage for AINP and AINN on the MAX11208AEUB+ is GND – 0.3V to VAVDD + 0.3V. Exceeding this range risks permanent damage. Under normal operation, the differential input voltage must stay within –VREF to +VREF, and common-mode voltage must remain between GND and VAVDD. Input protection diodes are not present - external clamping is required for overvoltage conditions.
MAX11208AEUB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 20
- Sampling Rate (Per Second):
- 120
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- Serial
- 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:
- 10-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11208AEUB+ FAQ
1.How can I place an order for MAX11208AEUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11208AEUB+ 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 MAX11208AEUB+ reliable?
The price and inventory of MAX11208AEUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11208AEUB+ is usually 5 days.
3.What payment methods are accepted for MAX11208AEUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11208AEUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11208AEUB+?
MAX11208AEUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11208AEUB+ 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 MAX11208AEUB+?
For technical support, including MAX11208AEUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11208AEUB+ requirements.
6.How does Aetrix verify that MAX11208AEUB+ is sourced from the original manufacturer or authorized distributors?
All MAX11208AEUB+ 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 MAX11208AEUB+ meets industry standards.
7.What is the process for return or replacement of MAX11208AEUB+?
All MAX11208AEUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11208AEUB+, 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 MAX11208AEUB+ part is unused and in its original packaging.
Return procedure for MAX11208AEUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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