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Analog Devices Inc./Maxim Integrated MAX1031BETI+T
- Part No.:
- MAX1031BETI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX1031BETI+T.pdf
- Description:
- IC ADC 10BIT SAR 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,944
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Product details
Overview
MAX1031BETI+T from Maxim Integrated is a 10-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±0.7°C accuracy at +25°C), 16-entry FIFO, and internal 2.5V reference. It supports 16 single-ended or 8 true-differential input channels in unipolar/bipolar modes and operates from a single +3V supply. It is used in industrial control systems for multichannel voltage and temperature monitoring with minimal host interface overhead.
For engineers reviewing the MAX1031BETI+T datasheet, MAX1031BETI+T pinout, MAX1031BETI+T application, or MAX1031BETI+T equivalent, this page delivers verified technical context, real-world design meaning of key specs, package-validated pin functions, and two confirmed alternative parts - all grounded in the official MAX1031 datasheet Rev 5 (8/2011) and Maxim's product documentation.
Technical Context
The MAX1031BETI+T implements a fully differential successive-approximation register (SAR) ADC architecture with on-chip track-and-hold, supporting both internally clocked (4.4MHz oscillator, ±10%) and externally clocked (up to 10MHz SCLK) conversion modes. Its analog front-end accepts configurable single-ended or true-differential inputs across 16 channels, with programmable unipolar (0 to VREF) or bipolar (±VREF/2) ranges.
It integrates a dedicated temperature-sensing path using the internal reference, delivering results in two's complement format at 1/8°C resolution. The 16-deep FIFO buffers conversion results and temperature data independently, enabling burst acquisition without serial bus contention - critical for deterministic sampling in system supervision and data-logging applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes; sufficient for medium-precision industrial sensing and control feedback loops. |
| Sampling Rate | 300ksps maximum - enables capture of signals up to 100kHz full-linear bandwidth (S/(N+D) > 68dB) for vibration or transient monitoring. |
| INL / DNL | ±1 LSB each - guarantees monotonicity and no missing codes over –40°C to +85°C, essential for closed-loop calibration and safety-critical measurements. |
| Temperature Accuracy | ±0.7°C at +25°C, ±1.2°C over full range - allows direct board-level thermal compensation without external sensor calibration. |
| Reference | Internal 2.5V ±0.4% (2.48V–2.52V), ±30ppm/°C TC - eliminates need for external reference IC while maintaining stable scaling across temperature. |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE-compatible 3-wire serial - compatible with standard microcontroller peripherals; supports CPOL/CPHA = 0 or 1 for flexible timing integration. |
| Supply Current | 1.75mA typical at 300ksps with internal reference - enables low-power operation in battery-backed or energy-constrained embedded systems. |
Pinout & Package
The MAX1031BETI+T is packaged in a 28-pin, 5mm × 5mm TQFN with exposed pad (EP), RoHS-compliant and lead-free. The exposed pad must be soldered to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN15 | Analog Input Channels | 16 configurable single-ended or 8 true-differential inputs; AIN12–AIN15 available only on MAX1031; supports unipolar/bipolar mode selection via setup register. |
| REF+/REF− | Reference Inputs | REF+ accepts 1.0V to (VDD + 50mV); REF− serves as negative reference or analog input (AIN14); internal 2.5V reference active by default for temp sensing. |
| CNVST/AIN15 | Conversion Start / Analog Input | Active-low conversion trigger; when configured as CNVST, initiates scan without serial bus use (clock mode 00); cannot be used as analog input simultaneously. |
| SCLK, DIN, DOUT, CS | Serial Interface Signals | Standard 3-wire SPI-compatible interface; DOUT updates on falling SCLK edge; EOC asserts low upon conversion completion (except clock mode 11). |
| EOC | End-of-Conversion Output | Active-low status flag; indicates data validity at DOUT; high in externally clocked mode (CKSEL=11); synchronizes host read timing. |
| VDD, GND, EP | Power and Ground | +2.7V to +3.6V single supply; 0.1μF bypass capacitor required on VDD and REF+; EP must be connected to GND for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | ±0.7°C accuracy at +25°C, 1/8°C resolution, always uses internal reference - enables simultaneous voltage and thermal monitoring without external components. |
| 16-Entry FIFO Buffer | Holds up to 16 ADC results plus one temperature reading - decouples conversion timing from host polling, reducing MCU interrupt load in real-time systems. |
| Configurable Input Architecture | True differential track-and-hold with selectable unipolar/bipolar ranges per channel pair - rejects common-mode noise and supports both ground-referenced and floating sensor signals. |
| Four Clock Modes | Selectable via CKSEL bits: internal timer (00/01/10) or external SCLK (11); supports autonomous scanning, single-shot CNVST triggering, or high-speed synchronized acquisition. |
| AutoShutdown™ | Reduces supply current to ≤0.5μA in shutdown - extends battery life in portable instrumentation and intermittent-monitoring applications. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
|
Use Scenario: Continuous logging of thermocouple outputs, pressure transducer voltages, and ambient temperature in PLC-based manufacturing lines. IC Role / Device Role / Timing Role: Multichannel ADC with integrated temp sensor performs synchronized voltage and board-temperature sampling every 3.3ms (300ksps aggregate rate). Use Value: Eliminates separate temperature IC and reference, reduces BOM count by 2–3 components, and ensures matched thermal drift between reference and sensor paths. |
Use Scenario: Compact wearable device measuring ECG lead voltages, skin temperature, and battery voltage in a single acquisition cycle. IC Role / Device Role / Timing Role: Single-chip solution acquiring 8 biopotential channels + temperature in <10ms using FIFO burst mode and internal clock. Use Value: Enables sub-100μA average system current during measurement bursts, extending coin-cell battery life beyond 7 days. |
| Data Logger for Environmental Sensors | Automated Test Equipment (ATE) Front-End |
|
Use Scenario: Solar-powered remote station recording soil moisture, air humidity, and enclosure temperature at 1Hz intervals over 10-year deployment. IC Role / Device Role / Timing Role: Low-power ADC wakes periodically, acquires 4 sensor channels + internal die temp, then enters AutoShutdown™ until next interval. Use Value: Achieves <2μA average supply current in sleep + active cycles, meeting stringent energy budget for maintenance-free field operation. |
Use Scenario: Modular ATE slot card digitizing 12 DUT analog outputs (voltage, current, temp) with per-channel gain/offset calibration. IC Role / Device Role / Timing Role: High-throughput ADC operating in externally clocked mode (CKSEL=11) at 300ksps, feeding FPGA-accelerated real-time analysis. Use Value: Delivers consistent 62dB SINAD across full bandwidth, enabling accurate characterization of DUT harmonic distortion up to 5th order. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, temperature-integrated ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit, 1MSPS, 16-channel SAR ADC; no integrated temp sensor; requires external reference; SPI interface. | Higher resolution and speed, but lacks on-chip temperature sensing - necessitates external thermal monitoring circuitry. | Choose when resolution >10-bit and sampling >300ksps are mandatory, and board space allows separate temp sensor + reference. |
| AD7949BCPZ-RL7 | 14-bit, 250ksps, 8-channel SAR ADC; includes internal reference; no integrated temp sensor; SPI interface. | Higher precision, lower max sampling rate, fewer channels, and no die temperature capability - limits system-level thermal correlation. | Prefer when absolute accuracy dominates over multichannel thermal awareness, e.g., precision sensor calibration benches. |
Compared with ADS7953IRHBT and AD7949BCPZ-RL7, the MAX1031BETI+T uniquely combines 10-bit precision, 16-channel flexibility, integrated temperature sensing, and internal reference in a single 5mm × 5mm TQFN - making it optimal for space-constrained, thermally aware embedded systems where component count and thermal path matching matter.
Availability
MAX1031BETI+T is available at Aetrix Electronics and suitable for industrial control systems, patient monitoring devices, and environmental data loggers requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.
Supply support for MAX1031BETI+T 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 communications applications.
The MAX1031BETI+T belongs to Maxim's low-power, multichannel ADC family engineered for system supervision and embedded data acquisition - emphasizing integration (temp sensor + ref + FIFO), small footprint, and robust operation across harsh environments.
FAQ
What is the operating temperature range for the MAX1031BETI+T?
The MAX1031BETI+T is specified for operation from –40°C to +85°C, matching the extended industrial temperature grade. This range is validated across all key parameters including INL, DNL, reference stability, and temperature sensor accuracy - ensuring reliable performance in factory automation, outdoor instrumentation, and automotive under-hood monitoring where thermal extremes occur.
Does the MAX1031BETI+T require an external reference voltage?
No, the MAX1031BETI+T includes a precision internal 2.5V reference (2.48V–2.52V, ±30ppm/°C TC) that is enabled by default and used for all temperature measurements. An external differential reference can be applied via REF+ and REF− pins if higher accuracy or custom scaling is needed, but it is not required for basic operation or thermal sensing.
How many analog input channels does the MAX1031BETI+T support?
The MAX1031BETI+T supports 16 single-ended analog inputs (AIN0–AIN15) or 8 true-differential input pairs (e.g., AIN0/AIN1, AIN2/AIN3, up to AIN14/AIN15). Channels AIN12–AIN15 are exclusive to the MAX1031 family and unavailable on MAX1027/MAX1029 - enabling higher channel density in compact designs.
Can the MAX1031BETI+T perform simultaneous sampling of multiple channels?
No, the MAX1031BETI+T uses a single SAR core with multiplexed inputs and does not support true simultaneous sampling. However, its fast acquisition time (0.6μs typical) and programmable scan modes allow tightly sequenced sampling across channels - achieving effective simultaneity for low-bandwidth signals (<10kHz) in applications like motor phase current monitoring.
What package type is used for the MAX1031BETI+T?
The MAX1031BETI+T is supplied in a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP). This RoHS-compliant, lead-free package provides superior thermal performance and board-level reliability compared to QSOP variants - and is the only package offered for the MAX1031BETI+T variant per Maxim's ordering information.
MAX1031BETI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 300k
- Number of Inputs:
- 8, 16
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-TQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1031BETI+T FAQ
1.How can I place an order for MAX1031BETI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1031BETI+T 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 MAX1031BETI+T reliable?
The price and inventory of MAX1031BETI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1031BETI+T is usually 5 days.
3.What payment methods are accepted for MAX1031BETI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1031BETI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1031BETI+T?
MAX1031BETI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1031BETI+T 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 MAX1031BETI+T?
For technical support, including MAX1031BETI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1031BETI+T requirements.
6.How does Aetrix verify that MAX1031BETI+T is sourced from the original manufacturer or authorized distributors?
All MAX1031BETI+T 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 MAX1031BETI+T meets industry standards.
7.What is the process for return or replacement of MAX1031BETI+T?
All MAX1031BETI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1031BETI+T, 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 MAX1031BETI+T part is unused and in its original packaging.
Return procedure for MAX1031BETI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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