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Analog Devices Inc./Maxim Integrated MAX11139ATI+
- Part No.:
- MAX11139ATI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX11139ATI+.pdf
- Description:
- IC ADC 10BIT SAR 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,036
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Product details
Overview
MAX11139ATI+ from Maxim Integrated is a 10-bit, 500ksps, low-power, serial-output SAR ADC with 8-channel analog multiplexer, external reference support (1V to VDD), and flexible input configuration (single-ended/differential/pseudo-differential). It operates from 2.35V–3.6V supply, consumes 4.2mW at full speed, and targets battery-powered data acquisition in industrial sensors and portable medical devices.
For engineers reviewing the MAX11139ATI+ datasheet, MAX11139ATI+ pinout, MAX11139ATI+ application, or MAX11139ATI+ equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply-ready availability details - all specific to the MAX11139ATI+ variant in 28-pin TQFN.
Technical Context
The MAX11139ATI+ implements a successive-approximation register (SAR) architecture with dual clock modes: internal clock (enabling FIFO buffering and on-chip averaging) and external clock (supporting SampleSet™ programmable channel sequencing). Its analog front-end supports 8 single-ended, 4 fully differential, or 8 pseudo-differential inputs relative to a common input.
It features a 1.5MHz full-linear bandwidth, ±0.4 LSB INL and DNL over temperature, 61.7dB SINAD at 250kHz input, and a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface operating up to 8MHz. Power management includes AutoShutdown™ (2µA shutdown current) and fast wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - Delivers 1024 discrete output codes; sufficient for medium-accuracy sensor digitization without oversampling overhead. |
| Sampling Rate | 500ksps - Supports real-time capture of signals up to ~250kHz (Nyquist-limited); enables closed-loop control loop updates every 2µs. |
| INL / DNL | ±0.4 LSB / ±0.4 LSB - Ensures monotonicity and <0.1% end-point linearity error across -40°C to +125°C; critical for precision calibration. |
| SINAD | 61.7dB (typ, 250kHz input) - Corresponds to ~10.3 effective bits; validates usable dynamic range for noisy industrial transducer signals. |
| Supply Current | 2mA (typ, 500ksps, VDD = 3V) - Enables operation from coin-cell or Li-ion sources with minimal voltage droop impact on adjacent circuitry. |
| Reference Range | 1V to VDD - Allows direct use of system rail (e.g., 2.5V or 3.3V) as reference; eliminates need for dedicated reference IC in space-constrained designs. |
| Interface Speed | 8MHz SCLK - Permits full 16-bit frame readout in ≤2µs; reduces MCU SPI bus occupancy and simplifies timing-critical firmware. |
Pinout & Package
MAX11139ATI+ is housed in a 28-pin, 5mm × 5mm, 0.5mm pitch TQFN package with exposed pad (EP) requiring connection to GND for thermal and noise performance. Pin functions are validated per Maxim's official pin configuration diagram for the 8-channel variant (MAX11136/MAX11139/MAX11142).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Analog Input Channels | 8 configurable inputs supporting single-ended, fully differential (4 pairs), or pseudo-differential modes; no external mux required. |
| CNVST | Active-Low Conversion Start | Edge-triggered command initiates conversion sequence; synchronous with internal clock or external SCLK depending on mode. |
| REF+, REF− | Differential Reference Inputs | Accept external reference (1V to VDD); REF− may also serve as AIN15 in 16-channel variants - not applicable to MAX11139ATI+. |
| VDD, DGND, GND, OVDD | Power and Ground Terminals | VDD (2.35–3.6V analog supply), OVDD (1.5–3.6V I/O supply), DGND (digital ground), GND (analog ground) - require separate bypassing per datasheet. |
| CS, SCLK, DIN, DOUT, EOC | 3-Wire Serial Interface | Standard SPI-compatible signals; EOC asserts low only in internal-clock mode to signal data readiness; DOUT is three-state when CS high. |
Key Features
| Feature | Design Value |
|---|---|
| SampleSet™ Channel Sequencing | User-programmable scan order (up to 256 steps) reduces MCU polling overhead and enables mixed-rate sampling (e.g., slow temp + fast vibration) without host intervention. |
| Internal FIFO (16-entry) | Buffers conversions during high-speed acquisition; allows asynchronous readout at slower clock rates - decouples sampling and processing timing. |
| Internal Averaging | Configurable averaging improves SNR by up to 3dB for noisy sensor outputs (e.g., thermocouple or strain gauge), reducing post-processing filtering needs. |
| Bipolar Input Ranges | Software-selectable ±VREF+/2 or ±VREF+ ranges support AC-coupled signals (e.g., audio, vibration) without external level-shifting circuitry. |
| AutoShutdown™ Mode | Enters 2µA shutdown state automatically between conversions; extends battery life in duty-cycled systems (e.g., wireless sensor nodes). |
Applications
| Industrial Sensor Node | Portable ECG Monitor |
|---|---|
Use Scenario: Multi-sensor data logging (temperature, pressure, humidity) in battery-powered field transmitters with 10-second wakeup intervals. IC Role / Device Role / Timing Role: Central 8-channel ADC acquiring synchronized samples from conditioned analog sensors; manages autonomous sequencing via SampleSet™. Use Value: 4.2mW active power and 2µA shutdown current enable >2-year battery life; 10-bit resolution meets industrial accuracy requirements (IEC 61000-4-5 compliance margin). |
Use Scenario: Low-power, wearable electrocardiogram acquisition with lead-off detection and motion artifact rejection. IC Role / Device Role / Timing Role: Front-end ADC digitizing differential electrode signals; uses pseudo-differential mode with common-mode reference for CMRR enhancement. Use Value: ±0.4 LSB INL ensures clinical-grade baseline stability; 1.5MHz input bandwidth preserves QRS complex fidelity; 3.3V-compatible OVDD simplifies integration with ARM Cortex-M0+ MCU. |
| Motor Drive Current Sensing | Smart Building HVAC Controller |
Use Scenario: Real-time phase current monitoring in BLDC inverter drives using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: High-speed sampling of 3 isolated current channels at 500ksps; leverages internal FIFO to absorb burst reads during PWM dead-time. Use Value: 500ksps rate captures 20kHz switching harmonics; 61.7dB SINAD maintains SNR under high dv/dt noise; 8MHz SCLK enables deterministic SPI transfer within 1µs interrupt latency. |
Use Scenario: Multi-zone environmental control unit aggregating CO₂, VOC, and ambient temperature readings across 8 zones. IC Role / Device Role / Timing Role: Shared ADC scanning 8 sensor inputs sequentially; uses internal clock mode with averaging to suppress 50/60Hz mains interference. Use Value: Single-chip solution replaces 8x 12-bit standalone ADCs; 28-pin TQFN saves >40mm² PCB area vs. SOIC alternatives; -40°C to +125°C rating ensures reliability in attic-mounted units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7957IRHBT | 10-bit, 1MSPS, 8-channel, SPI interface; requires external reference; no integrated FIFO or SampleSet™; 2.7–5.25V supply. | Higher speed but lacks autonomous sequencing and low-power shutdown; better suited for FPGA-based systems needing maximum throughput. | Select if raw speed >500ksps is mandatory and host processor can manage channel sequencing; avoid if battery life or autonomous operation is critical. |
| AD7476AWYRMZ-RL7 | 12-bit, 1MSPS, single-channel, SPI interface; no mux, no FIFO, no averaging; 2.7–5.25V supply; higher power (3.2mW @ 1MSPS). | Requires external analog mux and sequencer logic; superior resolution but no multichannel integration; unsuitable for space-constrained multi-sensor nodes. | Choose only when 12-bit resolution is essential and channel count is fixed at one; not a functional substitute for MAX11139ATI+'s integrated 8-channel capability. |
Compared with ADS7957IRHBT and AD7476AWYRMZ-RL7, the MAX11139ATI+ uniquely combines 8-channel integration, SampleSet™ autonomous sequencing, 2µA shutdown, and 1.5MHz analog bandwidth in a single 5mm × 5mm package - making it optimal for compact, battery-efficient, multichannel sensing where host MCU resources are constrained.
Availability
MAX11139ATI+ is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical instrumentation, motor drive current sensing, and smart building HVAC controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX11139ATI+ 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 demanding industrial, medical, and automotive applications.
The MAX11135–MAX11143 family was engineered to deliver high-speed, low-power, multichannel data acquisition in space- and energy-constrained systems - emphasizing integrated intelligence (SampleSet™, FIFO, averaging) over raw speed alone.
FAQ
What is the guaranteed INL and DNL performance of the MAX11139ATI+ over temperature?
The MAX11139ATI+ guarantees ±0.4 LSB integral nonlinearity (INL) and ±0.4 LSB differential nonlinearity (DNL) across the full -40°C to +125°C operating range, with no missing codes. This specification is production-tested and ensures monotonic behavior and predictable end-point accuracy in harsh environments like motor control enclosures or outdoor sensor housings.
Does the MAX11139ATI+ support differential input configurations?
Yes, the MAX11139ATI+ supports fully differential input pairs (4 channels), pseudo-differential inputs (8 channels relative to a common input), and single-ended inputs (8 channels). In fully differential mode, it accepts true differential signals up to ±VREF+ or ±VREF+/2 depending on RANGE bit setting - enabling high CMRR for noisy industrial signal chains without external instrumentation amplifiers.
How does the SampleSet™ feature reduce microcontroller overhead in the MAX11139ATI+?
SampleSet™ allows the MAX11139ATI+ to execute user-defined channel sequences (up to 256 steps) autonomously in external clock mode. Once loaded, the ADC cycles through inputs without host intervention - eliminating continuous polling or timer-driven GPIO toggling. This frees MCU cycles for computation or communication, lowers system-wide power, and reduces software complexity in resource-limited designs.
What is the minimum and maximum external reference voltage supported by the MAX11139ATI+?
The MAX11139ATI+ accepts an external reference voltage from 1.0V to VDD (max 3.6V) on the REF+ pin. The REF− pin must be tied to a stable reference point (typically AGND or a buffered negative reference); it does not support floating or actively driven REF− configurations. This wide reference range enables direct use of common system rails (e.g., 2.5V, 3.3V) without external reference ICs.
Can the MAX11139ATI+ operate with a 1.8V digital I/O supply?
Yes, the MAX11139ATI+ supports OVDD from 1.5V to 3.6V, making it fully compatible with 1.8V digital systems. Its digital inputs (CS, SCLK, DIN) recognize logic thresholds at 0.25×OVDD (low) and 0.75×OVDD (high), and its DOUT output swings rail-to-rail relative to OVDD - enabling direct interfacing with 1.8V FPGAs, microcontrollers, or ASICs without level shifters.
MAX11139ATI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.35V ~ 3.6V
- Voltage - Supply, Digital:
- 2.35V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 28-TQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11139ATI+ FAQ
1.How can I place an order for MAX11139ATI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11139ATI+ 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 MAX11139ATI+ reliable?
The price and inventory of MAX11139ATI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11139ATI+ is usually 5 days.
3.What payment methods are accepted for MAX11139ATI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11139ATI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11139ATI+?
MAX11139ATI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11139ATI+ 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 MAX11139ATI+?
For technical support, including MAX11139ATI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11139ATI+ requirements.
6.How does Aetrix verify that MAX11139ATI+ is sourced from the original manufacturer or authorized distributors?
All MAX11139ATI+ 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 MAX11139ATI+ meets industry standards.
7.What is the process for return or replacement of MAX11139ATI+?
All MAX11139ATI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11139ATI+, 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 MAX11139ATI+ part is unused and in its original packaging.
Return procedure for MAX11139ATI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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