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Analog Devices Inc./Maxim Integrated MAX11205AEUB+
- Part No.:
- MAX11205AEUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX11205AEUB+.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:113
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Product details
Overview
MAX11205AEUB+ from Maxim Integrated is a 16-bit, single-channel, ultra-low-power delta-sigma analog-to-digital converter with 2-wire serial interface, internal 2.4576MHz oscillator, and fully differential analog/reference inputs. It delivers 720nVRMS noise (typ), 3ppm INL, and 120sps output rate in a 10-pin µMAX package, optimized for high-dynamic-range sensor measurement in 4–20mA industrial loops.
For engineers reviewing the MAX11205AEUB+ datasheet, MAX11205AEUB+ pinout, MAX11205AEUB+ application, or MAX11205AEUB+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX11205AEUB+ implements a third-order delta-sigma modulator followed by an on-chip SINC4 digital filter, enabling 16-bit noise-free resolution with >80dB 50Hz/60Hz line-noise rejection at its fixed 120sps data rate. Its internal oscillator eliminates external timing components and ensures stable conversion timing across -40°C to +85°C.
It uses a 2-wire serial interface (SCLK and RDY/DOUT) where RDY/DOUT serves dual roles: indicating data readiness via active-low assertion and shifting out 16-bit two's complement data on SCLK rising edges-requiring exactly 25 clock pulses per read cycle to restore idle-high state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit full-scale with no missing codes-guarantees monotonicity and precision in low-drift sensor digitization. |
| Data Rate | 120 samples per second-matches industrial loop update requirements while enabling deep digital filtering. |
| INL Error | ±3 ppm FSR-ensures <0.0003% gain/offset nonlinearity over full scale, critical for calibrated pressure/temperature systems. |
| Input Noise | 720 nVRMS (MAX11205B variant); MAX11205AEUB+ uses MAX11205A core with 2.1 µVRMS thermal noise-optimized for higher-speed, lower-resolution trade-off. |
| Power Consumption | <300 µA total active current (AVDD + DVDD)-enables multi-year battery life in portable instrumentation. |
| Supply Ranges | Analog: 2.7–3.6V; Digital/I/O: 1.7–3.6V-supports mixed-voltage system integration with 1.8V logic and 3.3V analog rails. |
| 50/60Hz Rejection | >90 dB (MAX11205A)-achieved via synchronized SINC4 filter sampling, eliminating need for external notch filters in AC-coupled environments. |
Pinout & Package
Package: 10-pin µMAX (FMAX), RoHS-compliant, lead(Pb)-free, 3mm × 3mm body, 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Common ground reference | Single-point analog/digital return path-must be low-impedance and isolated from noisy digital returns to preserve 16-bit integrity. |
| REFP / REFN (Pins 2, 3) | Differential reference inputs | Accept 1V–VAVDD differential reference; common-mode range = 0 to VAVDD-enables ratiometric sensing with external references or AVDD itself. |
| AINN / AINP (Pins 4, 5) | Fully differential analog inputs | Support ±VREF input range in bipolar mode-rejects common-mode noise from long sensor leads in industrial settings. |
| AVDD (Pin 6) | Analog supply | 2.7–3.6V rail powering modulator, reference buffer, and analog front-end-requires local 0.1µF bypassing per Maxim layout guidelines. |
| DVDD (Pin 7) | Digital supply | 1.7–3.6V rail powering digital logic and serial interface-allows independent voltage scaling to minimize I/O power in mixed-signal systems. |
| RDY/DOUT (Pin 8) | Combined data-ready flag & serial output | Active-low RDY signal indicates valid conversion; same pin outputs 16-bit data MSB-first on SCLK rising edges-reduces PCB routing vs. separate control/data lines. |
| SCLK (Pin 9) | Serial clock input | Accepts up to 5MHz clock; controls all interface timing including data read, sleep entry, and self-calibration trigger-no external pull-ups required. |
| CLK (Pin 10) | External clock input | Disables internal oscillator when driven; accepts 2.4576MHz clock for MAX11205AEUB+-used only if tighter frequency stability than internal oscillator is required. |
Key Features
| Feature | Design Value |
|---|---|
| On-demand offset/gain self-calibration | Initiated via 26th SCLK pulse-compensates for temperature drift and supply variation without host MCU intervention or external calibration hardware. |
| Ultra-low sleep current (<0.1µA) | Enables wake-on-conversion operation in battery-powered nodes-device draws <100nA average over 1-second cycle with 120sps burst mode. |
| Integrated 2.4576MHz oscillator | Eliminates external crystal/capacitors and associated board space-reduces BOM count and improves reliability in harsh environments. |
| ±2kV HBM ESD protection | Protects AINP/AINN/REFP/REFN/AVDD/DVDD/CLK/SCLK/RDY/DOUT pins-meets IEC 61000-4-2 Level 2 for industrial field interfaces. |
| Power-on reset with dual-supply monitoring | Independent POR on AVDD (~1.25V threshold) and DVDD (~1.2V threshold) ensures deterministic startup even with asymmetric power sequencing. |
Applications
| RTD Temperature Sensing | 4–20mA Loop-Powered Transmitters |
|---|---|
|
Use Scenario: Precision platinum RTD (PT100/PT1000) measurement in HVAC or process control sensors. IC Role / Device Role: Delta-sigma ADC digitizing ratiometric bridge output with internal reference and differential inputs. Use Value: 16-bit resolution and 3ppm INL enable <0.01°C temperature accuracy; 720nVRMS noise supports sub-millidegree repeatability without oversampling. |
Use Scenario: Field transmitter converting pressure/flow sensor output into standardized 4–20mA analog signal. IC Role / Device Role: High-dynamic-range ADC interfacing with microcontroller and DAC in loop-powered architecture. Use Value: <300µA active current allows full operation within 3.5mA headroom of 4mA minimum loop current-enabling true 4mA start-up and diagnostics. |
| Portable Weigh Scales | Battery-Powered Data Loggers |
|
Use Scenario: High-precision handheld or benchtop weighing equipment requiring milligram resolution. IC Role / Device Role: ADC capturing output from strain-gauge load cells with programmable gain and low-noise front-end. Use Value: Fully differential inputs reject common-mode noise from mechanical vibration; 120sps rate supports real-time display refresh without aliasing. |
Use Scenario: Remote environmental monitoring node logging temperature, humidity, and gas concentration over years on coin cell. IC Role / Device Role: Low-power sensor interface ADC performing periodic conversions and entering deep sleep between samples. Use Value: <0.1µA sleep current extends CR2032 battery life beyond 10 years at 1-sample-per-minute duty cycle-validated across -40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX11205BEUB+ | 13.75sps output rate, 2.2528MHz internal clock, 720nVRMS noise (vs. 2.1µVRMS in A-grade), higher 50/60Hz rejection (144dB) | Optimized for ultra-low-noise, low-data-rate applications like laboratory-grade weigh scales-not suitable for 120sps loop transmitters. | Select MAX11205BEUB+ only when maximum noise rejection and lowest possible power dominate over speed requirements. |
| ADS1220IPWR | 24-bit resolution, 2000sps max, PGA (1–128), SPI interface, no internal oscillator-requires external clock and more complex firmware. | Targets higher-precision applications needing programmable gain and faster updates-adds design complexity and power overhead. | Choose ADS1220IPWR when 24-bit resolution or integrated PGA is mandatory; avoid if 16-bit/120sps/2-wire simplicity is preferred. |
Compared with MAX11205BEUB+, the MAX11205AEUB+ trades lower noise and deeper line-rejection for 8.7× higher data rate and faster response-making it uniquely suited for real-time industrial loop control. Against ADS1220IPWR, it offers simpler 2-wire timing, guaranteed low-power operation, and reduced system-level validation effort despite lower bit depth.
Availability
MAX11205AEUB+ is available at Aetrix Electronics and suitable for industrial sensor interfaces, 4–20mA loop transmitters, and portable instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX11205AEUB+ 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, mixed-signal, and high-reliability ICs for industrial, medical, and automotive applications-emphasizing low power, small size, and robust performance.
The MAX11205AEUB+ belongs to Maxim's ultra-low-power delta-sigma ADC family, engineered specifically for battery-operated and loop-powered sensor nodes demanding high resolution without sacrificing energy efficiency or board space.
FAQ
What is the maximum sample rate supported by the MAX11205AEUB+?
The MAX11205AEUB+ operates at a fixed output data rate of 120 samples per second, as defined by its internal 2.4576MHz oscillator and SINC4 filter configuration. This rate is not user-programmable and is optimized to deliver >90dB 50Hz/60Hz rejection while maintaining ultra-low power consumption. Attempting to force higher rates via external clock will disrupt filter synchronization and degrade AC performance.
Does the MAX11205AEUB+ require external components for basic operation?
No-MAX11205AEUB+ requires only two 0.1µF ceramic bypass capacitors (one on AVDD, one on DVDD), plus standard PCB layout practices. Its internal 2.4576MHz oscillator eliminates crystals or RC networks, and its 2-wire interface needs no pull-up resistors. External reference is optional: the device can operate ratiometrically using AVDD as reference across REFP/REFN.
How does the MAX11205AEUB+ handle power supply sequencing?
The MAX11205AEUB+ incorporates independent power-on reset (POR) circuits on both AVDD (~1.25V threshold) and DVDD (~1.2V threshold), each with 100mV hysteresis and low-pass filtering. This ensures reliable initialization regardless of supply ramp order-critical in systems where analog and digital rails power up at different rates. Bypass capacitors must be placed within 2mm of respective pins per Maxim layout guidance.
Can the MAX11205AEUB+ perform self-calibration automatically on wake-up from sleep mode?
Yes-the MAX11205AEUB+ supports automatic self-calibration triggered upon exit from sleep mode, but only when the 25th SCLK pulse is applied to pull RDY/DOUT high *before* sleep activation, followed by holding SCLK high during sleep. On wake-up, it executes offset/gain calibration before asserting RDY/DOUT low with new data-compensating for thermal and supply shifts incurred during extended shutdown.
What is the absolute maximum input voltage range for AINP and AINN on the MAX11205AEUB+?
The absolute maximum voltage on AINP and AINN is -0.3V to (VAVDD + 0.3V) relative to GND. Within normal operation, the differential input range is ±VREF, and the common-mode voltage must stay between GND and VAVDD. Exceeding these limits-even momentarily-can cause latch-up or permanent damage, as confirmed in the Absolute Maximum Ratings table on page 2 of the datasheet.
MAX11205AEUB+ 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:
- 16
- 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:
- -
MAX11205AEUB+ FAQ
1.How can I place an order for MAX11205AEUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11205AEUB+ 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 MAX11205AEUB+ reliable?
The price and inventory of MAX11205AEUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11205AEUB+ is usually 5 days.
3.What payment methods are accepted for MAX11205AEUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11205AEUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11205AEUB+?
MAX11205AEUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11205AEUB+ 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 MAX11205AEUB+?
For technical support, including MAX11205AEUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11205AEUB+ requirements.
6.How does Aetrix verify that MAX11205AEUB+ is sourced from the original manufacturer or authorized distributors?
All MAX11205AEUB+ 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 MAX11205AEUB+ meets industry standards.
7.What is the process for return or replacement of MAX11205AEUB+?
All MAX11205AEUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11205AEUB+, 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 MAX11205AEUB+ part is unused and in its original packaging.
Return procedure for MAX11205AEUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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