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Analog Devices Inc./Maxim Integrated MAX11208BEUB+
- Part No.:
- MAX11208BEUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX11208BEUB+.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:239
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Product details
Overview
The MAX11208BEUB+ from Analog Devices is a 20-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 20-bit noise-free resolution at 13.75sps, 720nVRMS input-referred noise, 3ppm INL, and operates from 2.7V–3.6V AVDD with <300µA total active current. Its integrated 2.2528MHz oscillator and 2-wire serial interface enable precision industrial temperature and pressure sensing without external timing components.
For engineers reviewing the MAX11208BEUB+ datasheet, MAX11208BEUB+ pinout, MAX11208BEUB+ application, or MAX11208BEUB+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts - all grounded in the official Analog Devices datasheet Rev 1 (7/20).
Technical Context
The MAX11208BEUB+ implements a third-order delta-sigma modulator paired with an on-chip SINC4 digital filter, delivering 20-bit noise-free resolution at its rated 13.75sps output rate. Its internal 2.2528MHz oscillator eliminates external crystal requirements and enables >80dB rejection of 50Hz/60Hz line noise via programmable digital filtering.
It supports fully differential analog inputs (AINP/AINN) and reference inputs (REFP/REFN), with common-mode voltage range from GND to AVDD and differential reference range from 1V to AVDD. Power-on reset circuitry monitors both AVDD and DVDD independently, ensuring reliable startup across supply sequencing scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit full-scale; 20-bit noise-free at 13.75sps - guarantees usable LSB stability for high-precision DC measurements like RTD or strain gauge outputs. |
| Input Noise | 720nVRMS - enables sub-µV-level signal resolution in low-frequency sensor applications without external amplification. |
| INL Error | ±3ppm FSR - ensures <0.0003% gain error over full scale, critical for calibrated industrial transmitters. |
| Power Consumption | <300µA total active current (AVDD + DVDD) - allows continuous operation for years on coin-cell batteries in portable instrumentation. |
| Line Rejection | 144dB 50/60Hz rejection (MAX11208B) - eliminates need for external notch filters in AC-noise-prone factory environments. |
| Supply Range | 2.7V–3.6V AVDD, 1.7V–3.6V DVDD - supports direct connection to 3.3V rails and compatibility with low-voltage microcontrollers. |
| Operating Temp | –40°C to +85°C - qualified for deployment in uncontrolled industrial enclosures and outdoor sensor nodes. |
Pinout & Package
Package: 10-pin µMAX® (U10+2), RoHS-compliant, 3mm × 3mm body, 0.5mm pitch, exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Common ground reference | Analog/digital ground tie point; requires low-inductance connection to system ground plane to maintain PSRR and CMRR performance. |
| 2 REFP | Differential reference positive input | Accepts voltage up to AVDD; must be > REFN; sets full-scale range when used with REFN - enables ratiometric measurements with external references. |
| 3 REFN | Differential reference negative input | Accepts voltage down to GND; must be < REFP; defines lower bound of reference differential voltage - supports bipolar input configurations. |
| 4 AINN | Negative fully differential analog input | Accepts –VREF to +VREF relative to AINP; matched input impedance enables true differential rejection of common-mode interference. |
| 5 AINP | Positive fully differential analog input | Primary signal input; modulator input range is ±VREF - ideal for bridge sensors and RTDs with Kelvin connections. |
| 6 AVDD | Analog supply voltage | 2.7V–3.6V supply; powers modulator, reference buffer, and analog front-end - requires local 0.1µF ceramic bypass near pin. |
| 7 DVDD | Digital supply voltage | 1.7V–3.6V supply; powers digital logic, filter, and serial interface - independent rail allows interfacing with 1.8V or 3.3V controllers. |
| 8 RDY/DOUT | Data-ready indicator / serial data output | Open-drain output signals conversion completion (low) and shifts out 20-bit two's complement data on SCLK rising edges - eliminates need for separate status lines. |
| 9 SCLK | Serial clock input | Accepts up to 5MHz clock; controls data read timing, sleep activation, and self-calibration initiation - no external pull-up required in 2-wire mode. |
| 10 CLK | External clock input | Disables internal oscillator when driven; accepts 2.2528MHz clock for MAX11208B - used only if higher clock accuracy or synchronization is required. |
Key Features
| Feature | Design Value |
|---|---|
| On-demand self-calibration | Offset and gain calibration initiated via 26th SCLK pulse - corrects for drift due to temperature or supply variation without interrupting system operation. |
| Ultra-low sleep current | <0.1µA total sleep current (AVDD + DVDD) - extends battery life in wake-on-event sensor nodes by orders of magnitude versus standard ADCs. |
| Integrated 2.2528MHz oscillator | No external crystal or RC network required - reduces BOM count, PCB area, and startup time while maintaining ±0.1% frequency stability over temperature. |
| 2-wire serial interface | SCLK + RDY/DOUT only - eliminates CS, MOSI, MISO pins and simplifies routing in space-constrained modules like field transmitter heads. |
| ±2kV HBM ESD protection | On AVDD, AINP, AINN, REFP, REFN, DVDD, CLK, SCLK, RDY/DOUT, GND - withstands handling and field surges without external TVS diodes. |
Applications
| RTD Temperature Measurement | 4–20mA Loop-Powered Transmitter |
|---|---|
|
Use Scenario: Precision platinum RTD (PT100/PT1000) sensing in HVAC or process control with 0.1°C resolution over –40°C to +125°C. IC Role / Device Role / Timing Role: Delta-sigma ADC digitizes ratiometric bridge voltage; internal oscillator synchronizes conversion timing; 2-wire interface minimizes loop wiring. Use Value: 20-bit noise-free resolution at 13.75sps directly resolves 0.01°C steps without oversampling; 720nVRMS noise avoids additional PGA stages. |
Use Scenario: Industrial pressure transmitter powered solely from 4–20mA loop, requiring stable 16+ bit measurement under varying loop voltage (12–36V). IC Role / Device Role / Timing Role: Primary sensor digitizer; ultra-low active current (<300µA) leaves ample headroom for loop-powered operation; internal clock eliminates timing dependencies on loop controller. Use Value: Full-scale 3ppm INL ensures <0.0003% gain error across temperature - meets SIL-2 functional safety calibration requirements without periodic recalibration. |
| Portable Weigh Scale | Battery-Powered Strain Gauge Node |
|
Use Scenario: Handheld food or pharmaceutical scale operating from CR2032 battery with 1g resolution over 5kg range. IC Role / Device Role / Timing Role: High-resolution ADC for load cell output; sleep mode (<0.1µA) enables multi-year standby; 2-wire interface reduces MCU GPIO usage. Use Value: 20-bit resolution at 13.75sps captures micro-strain changes; 144dB 50/60Hz rejection prevents AC mains interference in lab environments. |
Use Scenario: Wireless structural health monitor attached to bridges or machinery, sampling strain gauges every 10 seconds using Li-SOCl₂ battery. IC Role / Device Role / Timing Role: Low-power sensor front-end; on-demand calibration compensates for long-term drift during infrequent wake-ups; differential inputs reject cable noise. Use Value: <300µA active current + <0.1µA sleep current enables >10-year battery life; fully differential architecture rejects common-mode noise from long sensor cables. |
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 |
|---|---|---|---|
| ADS124S08IPW | 24-bit resolution, 4kSPS max, SPI interface, integrated PGA (1x–128x), 350µA active current | Requires external clock and SPI bus; better for multiplexed multi-channel systems; higher power limits battery life | Select when >20-bit resolution or programmable gain is needed; not drop-in due to SPI protocol and pinout mismatch |
| AD7172-2BRUZ | 24-bit resolution, 31.25kSPS, SPI interface, 385µA active current, integrated reference | Higher speed and resolution but 28% higher power; requires external reference or uses internal 2.5V ref; larger 24-pin TSSOP package | Choose for faster sampling or when integrated reference simplifies design; incompatible pinout and interface prevent direct replacement |
Compared with ADS124S08IPW and AD7172-2BRUZ, the MAX11208BEUB+ offers the lowest power per bit (720nVRMS @ <300µA) and smallest footprint (10-pin µMAX), making it uniquely suited for space- and energy-constrained single-sensor nodes where 20-bit resolution suffices.
Availability
The MAX11208BEUB+ is available at Aetrix Electronics and suitable for RTD temperature measurement, 4–20mA loop-powered transmitters, and portable weigh scales requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX11208BEUB+ 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 semiconductors, serving industrial, automotive, communications, and healthcare markets with precision data conversion and power management solutions.
The MAX11208BEUB+ belongs to Analog Devices' ultra-low-power delta-sigma ADC product line, designed specifically for battery-operated and loop-powered sensor interfaces demanding maximum resolution per microwatt in harsh industrial environments.
FAQ
What is the maximum sample rate of the MAX11208BEUB+?
The MAX11208BEUB+ has a fixed output data rate of 13.75 samples per second (sps), as defined by its B-grade variant and internal 2.2528MHz oscillator configuration. This rate is optimized for ultra-low-noise, high-resolution DC measurements and cannot be increased via software or external clock adjustment - attempting higher rates degrades noise performance and violates specification limits.
Does the MAX11208BEUB+ require external calibration components?
No, the MAX11208BEUB+ does not require external calibration components. It features on-demand offset and gain self-calibration triggered by a 26th SCLK pulse, using internal circuitry to correct for drift. The internal 2.2528MHz oscillator also eliminates the need for external timing components, enabling fully autonomous operation in remote sensor nodes.
Can the MAX11208BEUB+ operate from a single 3.3V supply?
Yes, the MAX11208BEUB+ can operate from a single 3.3V supply applied to both AVDD and DVDD pins. Its analog supply range is 2.7V–3.6V and digital supply range is 1.7V–3.6V, so 3.3V falls within both specifications. However, optimal noise performance is achieved when AVDD is decoupled with a dedicated 0.1µF ceramic capacitor placed close to pin 6.
How does the 2-wire interface of the MAX11208BEUB+ differ from standard I²C?
The MAX11208BEUB+ 2-wire interface uses SCLK and RDY/DOUT only but is not I²C-compatible. It lacks address bytes, ACK/NACK signaling, and bidirectional data lines. Instead, RDY/DOUT serves dual roles: indicating data readiness (active-low) and shifting out 20-bit data on SCLK rising edges. Communication relies entirely on precise SCLK timing - no pull-up resistors or I²C protocol stack is required.
What is the purpose of the CLK pin on the MAX11208BEUB+?
The CLK pin on the MAX11208BEUB+ accepts an external 2.2528MHz clock signal to disable the internal oscillator. This is used when higher clock accuracy, synchronization to a system master clock, or reduced jitter is required. When unused, CLK should be left floating or tied to GND - driving it with incorrect frequency or voltage risks undefined behavior or increased power consumption.
MAX11208BEUB+ 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):
- 13.75
- 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:
- -
MAX11208BEUB+ FAQ
1.How can I place an order for MAX11208BEUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11208BEUB+ 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 MAX11208BEUB+ reliable?
The price and inventory of MAX11208BEUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11208BEUB+ is usually 5 days.
3.What payment methods are accepted for MAX11208BEUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11208BEUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11208BEUB+?
MAX11208BEUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11208BEUB+ 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 MAX11208BEUB+?
For technical support, including MAX11208BEUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11208BEUB+ requirements.
6.How does Aetrix verify that MAX11208BEUB+ is sourced from the original manufacturer or authorized distributors?
All MAX11208BEUB+ 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 MAX11208BEUB+ meets industry standards.
7.What is the process for return or replacement of MAX11208BEUB+?
All MAX11208BEUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11208BEUB+, 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 MAX11208BEUB+ part is unused and in its original packaging.
Return procedure for MAX11208BEUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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