My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX11205BEUB+
- Part No.:
- MAX11205BEUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX11205BEUB+.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,543
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX11205BEUB+ from Maxim Integrated is a 16-bit, single-channel, ultra-low-power delta-sigma ADC optimized for high-dynamic-range sensor measurement in 4–20mA industrial loops. It delivers 13.75 SPS output rate, 720nVRMS noise, and 3ppm INL with fully differential analog and reference inputs, operating from 2.7V–3.6V AVDD and 1.7V–3.6V DVDD.
For engineers reviewing the MAX11205BEUB+ datasheet, MAX11205BEUB+ pinout, MAX11205BEUB+ application, or MAX11205BEUB+ equivalent, this page provides verified technical context, real-world timing behavior, calibrated performance at temperature extremes, ESD-hardened 10-pin µMAX package details, and validated alternatives for low-power precision sensing designs.
Technical Context
The MAX11205BEUB+ implements a 3rd-order delta-sigma modulator followed by an on-chip SINC4 digital filter, enabling >80dB 50Hz/60Hz line-noise rejection without external components. Its internal 2.2528MHz oscillator eliminates clock-source dependencies while supporting external clock input via CLK pin.
It uses a 2-wire serial interface (SCLK + RDY/DOUT) with dual-function RDY/DOUT signaling data readiness and shifting out 16-bit two's complement conversion results MSB-first - no separate CS or data-direction control required. Power-on reset monitors both AVDD and DVDD with 100mV hysteresis and triggers self-calibration if reference voltage is stable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit full-scale with no missing codes - guarantees monotonicity and deterministic LSB step size across full input range. |
| Output Data Rate | 13.75 SPS - fixed rate for MAX11205B variant; enables precise integration time matching to 50/60Hz rejection windows. |
| Input Noise | 720nVRMS - measured at 13.75 SPS; defines effective resolution limit for low-level sensor signals like RTDs or strain gauges. |
| INL Error | ±3ppm FSR - ensures <0.0003% gain-linearity deviation over full scale, critical for metrology-grade calibration traceability. |
| Operating Current | <300µA total (AVDD + DVDD) active, <0.1µA sleep - enables multi-year battery life in portable instrumentation and loop-powered sensors. |
| ESD Protection | ±2kV HBM on AVDD, AINP, AINN, REFP, REFN, DVDD, CLK, RDY/DOUT, GND - sustains field deployment in noisy industrial environments. |
| Temperature Range | -40°C to +85°C - qualified for use in harsh industrial enclosures and outdoor process control nodes without derating. |
Pinout & Package
MAX11205BEUB+ is housed in a lead(Pb)-free, RoHS-compliant 10-pin µMAX (FMAX) package - 3mm × 3mm body, 0.65mm pitch, exposed pad for thermal enhancement. Pin 1 is GND; pin 10 is CLK.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Analog & digital ground reference | Single shared ground plane required; decoupling capacitors must connect here to minimize noise coupling between analog/digital sections. |
| REFP / REFN | Differential reference inputs | Accept 1V–VAVDD differential reference; common-mode range 0–VAVDD; enables ratiometric measurement with external references or internal AVDD. |
| AINP / AINN | Fully differential analog inputs | Support bipolar input range ±VREF; high CMR (>90dB DC, >144dB at 50/60Hz) rejects interference in noisy sensor wiring. |
| AVDD | Analog supply | 2.7V–3.6V operation; supplies modulator and reference buffer; requires local 0.1µF ceramic bypass to GND. |
| DVDD | Digital supply | 1.7V–3.6V operation; powers digital logic and serial interface; independent rail allows mixed-voltage system interfacing. |
| RDY/DOUT | Data-ready indicator & serial data output | Open-drain compatible; pulled low when conversion completes; outputs 16-bit result on rising SCLK edges after RDY assertion. |
| SCLK | Serial clock input | Accepts up to 5MHz clock; controls all interface timing including data read, sleep entry, and self-calibration initiation. |
| CLK | External clock input | Disables internal oscillator when driven; accepts 2.2528MHz signal for MAX11205B; used to synchronize multiple ADCs or reduce jitter. |
Key Features
| Feature | Design Value |
|---|---|
| On-demand self-calibration | Initiated via 26th SCLK pulse; corrects offset/gain drift due to temperature or supply variation without host MCU intervention. |
| Single-cycle conversion mode | Filter resets after each conversion; ensures clean transient response and eliminates inter-conversion data leakage in burst-sampling applications. |
| 2-wire serial interface | Eliminates chip-select and direction-control lines; reduces PCB routing complexity and I/O count in space-constrained sensor nodes. |
| Ultra-low sleep current | <0.1µA typical; enables wake-on-convert architectures where ADC remains powered but idle between measurements. |
| Internal oscillator accuracy | 2.2528MHz ±0.5% over -40°C to +85°C; removes need for external crystal or oscillator, reducing BOM cost and board area. |
Applications
| RTD Temperature Sensing | Strain Gauge Bridge Measurement |
|---|---|
Use Scenario: Precision temperature monitoring in HVAC ducts or chemical reactors using Pt100/Pt1000 RTDs with 2-, 3-, or 4-wire configurations. IC Role / Device Role / Timing Role: Delta-sigma ADC digitizes low-level ratiometric bridge voltage; internal SINC4 filter rejects 50/60Hz ambient noise during slow-scan acquisition. Use Value: Achieves <0.01°C resolution with 720nVRMS noise floor and ±3ppm INL - meets Class A RTD accuracy per IEC 60751 without external amplification. | Use Scenario: Load-cell and pressure transducer readout in industrial weighing systems and hydraulic monitoring. IC Role / Device Role / Timing Role: Digitizes mV-level differential output from Wheatstone bridges; fully differential inputs reject common-mode noise from long cable runs. Use Value: Delivers 16-bit no-missing-codes performance with >144dB 50/60Hz rejection - eliminates need for external notch filters or synchronous demodulation. |
| 4–20mA Loop-Powered Sensors | Portable Battery-Powered Meters |
Use Scenario: Smart transmitter design where ADC, microcontroller, and DAC share limited loop power budget (<4mA quiescent). IC Role / Device Role / Timing Role: Ultra-low-power ADC core consumes only 230–300µA active and <0.1µA sleep - preserves headroom for signal conditioning and communication. Use Value: Enables full-featured HART-enabled transmitters with onboard calibration and diagnostics while staying within 3.5mA average loop current. | Use Scenario: Handheld multimeters, environmental data loggers, and portable gas analyzers requiring multi-year battery life. IC Role / Device Role / Timing Role: Sleep-mode activation between readings reduces average current to sub-µA levels; wake-up time of 73ms supports responsive user interaction. Use Value: Extends CR2032 battery life beyond 5 years in 1-sample-per-minute logging mode - validated across -40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1220IPWR | 24-bit resolution, 2000 SPS max, SPI interface, integrated PGA and reference; higher power (350µA active) | Better suited for high-speed, high-resolution applications with variable gain needs; lacks native 2-wire simplicity | Select ADS1220IPWR when resolution >16-bit or programmable gain is required; avoid if minimizing I/O pins or power is primary constraint. |
| AD7170BRUZ | 16-bit, 100 SPS, SPI interface, 2.7–5.25V supply, 170µA active current; no internal oscillator | Requires external clock source; lower noise (350nVRMS) but narrower supply range compatibility | Choose AD7170BRUZ for ultra-low-noise, externally clocked systems where SPI infrastructure already exists and AVDD >3.6V is acceptable. |
Compared with ADS1220IPWR and AD7170BRUZ, the MAX11205BEUB+ uniquely balances ultra-low power (<300µA), true 2-wire simplicity, and factory-trimmed internal oscillator - making it optimal for cost-sensitive, space-constrained, loop-powered sensor nodes where 13.75 SPS suffices.
Availability
MAX11205BEUB+ is available at Aetrix Electronics and suitable for industrial sensor interfaces, 4–20mA loop-powered transmitters, and portable battery-operated instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for MAX11205BEUB+ 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 power-management ICs for industrial, medical, and communications applications.
The MAX11205BEUB+ belongs to Maxim's ultra-low-power delta-sigma ADC family, engineered specifically for high-accuracy, low-power sensor signal conditioning in resource-constrained industrial and portable systems.
FAQ
What is the exact output data rate of the MAX11205BEUB+?
The MAX11205BEUB+ has a fixed output data rate of 13.75 samples per second (SPS), as defined by its "B" variant designation in the MAX11205 family. This rate is internally configured and cannot be adjusted via software or external timing - it ensures optimal 50Hz/60Hz line-noise rejection with the on-chip SINC4 filter.
Does the MAX11205BEUB+ require external components for basic operation?
No, the MAX11205BEUB+ requires only two 0.1µF ceramic decoupling capacitors (one on AVDD–GND, one on DVDD–GND) for stable operation. Its internal 2.2528MHz oscillator, fully differential architecture, and on-demand self-calibration eliminate the need for external clocks, op-amps, or reference buffers in most precision sensor applications.
How does the 2-wire interface of the MAX11205BEUB+ differ from standard I²C?
The MAX11205BEUB+ 2-wire interface uses SCLK and RDY/DOUT only - no dedicated data-in line or address bits. Unlike I²C, it is unidirectional (read-only), timing-driven (no ACK/NACK), and relies on SCLK edge counting (e.g., 25th pulse to clear RDY) rather than address-based transactions. This reduces MCU GPIO usage but requires precise clock-edge sequencing.
Can the MAX11205BEUB+ perform self-calibration automatically after waking from sleep mode?
Yes - the MAX11205BEUB+ supports automatic self-calibration at wake-up. After exiting sleep mode, if the 25th SCLK pulse has been issued to set RDY/DOUT high and the 26th SCLK is held high during shutdown, the device initiates offset/gain calibration upon the next SCLK falling edge after wake-up, completing before the next RDY assertion.
What is the maximum allowable voltage on the AINP and AINN pins of the MAX11205BEUB+?
The absolute maximum voltage on AINP and AINN is GND − 30mV to VAVDD + 30mV, per the Absolute Maximum Ratings table. For proper linear operation, the differential input voltage must stay within ±VREF, and common-mode voltage must remain between GND and VAVDD. Exceeding these limits risks damage or measurement inaccuracy.
MAX11205BEUB+ 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):
- 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:
- -
MAX11205BEUB+ FAQ
1.How can I place an order for MAX11205BEUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11205BEUB+ 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 MAX11205BEUB+ reliable?
The price and inventory of MAX11205BEUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11205BEUB+ is usually 5 days.
3.What payment methods are accepted for MAX11205BEUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11205BEUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11205BEUB+?
MAX11205BEUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11205BEUB+ 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 MAX11205BEUB+?
For technical support, including MAX11205BEUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11205BEUB+ requirements.
6.How does Aetrix verify that MAX11205BEUB+ is sourced from the original manufacturer or authorized distributors?
All MAX11205BEUB+ 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 MAX11205BEUB+ meets industry standards.
7.What is the process for return or replacement of MAX11205BEUB+?
All MAX11205BEUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11205BEUB+, 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 MAX11205BEUB+ part is unused and in its original packaging.
Return procedure for MAX11205BEUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX11205BEUB+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
