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Analog Devices Inc./Maxim Integrated MAX1231BETI+T
- Part No.:
- MAX1231BETI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX1231BETI+T.pdf
- Description:
- IC ADC 12BIT SAR 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,868
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Product details
Overview
MAX1231BETI+T from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±0.7°C accuracy), 16-entry FIFO, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It features 16 single-ended or 8 true differential input channels, operates from a single +3V supply, and supports unipolar/bipolar modes for industrial data acquisition and system supervision.
For engineers reviewing the MAX1231BETI+T datasheet, MAX1231BETI+T pinout, MAX1231BETI+T application, or MAX1231BETI+T equivalent, this page delivers verified specifications, package mapping to 28-pin TQFN-EP (5mm × 5mm), confirmed FIFO depth and temperature-sensing capability, real-world timing behavior in clock modes 00–11, and validated alternative options for multichannel precision ADC selection.
Technical Context
The MAX1231BETI+T employs a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, supporting both single-ended and true differential inputs across its 16-channel analog multiplexer. Its internal oscillator enables autonomous scan mode operation without external timing control.
It integrates an internal 2.5V reference (±30ppm/°C TC, 200µVRMS noise) and a calibrated temperature sensor (1/8°C resolution, ±1.2°C error over –40°C to +85°C). Conversion results are buffered in a 16-deep FIFO, with temperature measurements always using the internal reference and occupying one FIFO slot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB INL/DNL accuracy with no missing codes over temperature. |
| Sampling Rate | 300ksps maximum with external clock - enables high-speed transient capture in undersampling applications. |
| Analog Inputs | 16 single-ended or 8 true differential channels - configurable per setup register for flexible signal routing. |
| Internal Reference | 2.50V ±20mV (±30ppm/°C) - eliminates need for external reference in most precision monitoring designs. |
| Temperature Sensor | ±0.7°C accuracy at +25°C, ±1.2°C over full range - provides system-level thermal awareness without external sensors. |
| FIFO Depth | 16 entries + 1 temperature slot - decouples conversion from serial bus activity, reducing µP overhead. |
| Supply Current | 1.75mA at 300ksps (internal ref), 0.2–5µA shutdown - supports low-power battery or energy-harvesting systems. |
Pinout & Package
The MAX1231BETI+T is packaged in a 28-pin TQFN with exposed pad (5mm × 5mm), requiring connection of the EP pad to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN15 | Analog Input Channels | 16 configurable inputs; AIN14/AIN15 available only in MAX1231; used for voltage or temperature sampling. |
| REF+/REF− | Reference Inputs | REF+ accepts 1.0V to VDD+50mV; REF− serves as negative reference or analog input (AIN14); internal ref bypassed via 0.1µF to GND. |
| CNVST/AIN15 | Active-Low Conversion Start / Analog Input | In clock modes 00/01, acts as hardware trigger; when configured as AIN15, enables full 16-channel use. |
| SCLK, DIN, DOUT, CS | 3-Wire Serial Interface | 10MHz SPI/QSPI/MICROWIRE-compatible; DOUT active on SCLK falling edge; CS enables tri-state output. |
| EOC | End-of-Conversion Output | Active-low pulse signals completion; behavior varies by clock mode (e.g., per-conversion in mode 01, batch-ready in mode 10). |
| VDD, GND, EP | Power & Ground | +2.7V to +3.6V operation; EP must be soldered to GND plane for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Enables burst-mode acquisition without serial bus contention-critical for deterministic real-time data logging. |
| Internal temperature sensor | Delivers calibrated die temperature measurement (±0.7°C at +25°C) independent of external components or calibration effort. |
| True differential track-and-hold | Supports 8 differential pairs (e.g., AIN0/AIN1) with common-mode rejection-essential for noisy industrial sensor interfaces. |
| Four programmable clock modes | Allows flexible timing control: hardware-triggered (mode 00), single-shot CNVST (mode 01), µP-initiated (mode 10), or externally clocked (mode 11). |
| AutoShutdown™ | Reduces supply current to ≤5µA after conversion sequence-extends battery life in portable instrumentation. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous monitoring of pressure, flow, and temperature sensors in PLC-based control cabinets with limited µP bandwidth. IC Role / Device Role / Timing Role: Central multichannel ADC performing synchronized scans across 12+ analog sensors while embedding local temperature compensation. Use Value: FIFO buffering and scan mode eliminate serial polling delays; internal reference ensures stable readings despite supply rail variation. |
Use Scenario: Portable ECG/SpO₂ monitor acquiring biopotential signals and ambient temperature for clinical-grade calibration. IC Role / Device Role / Timing Role: Simultaneous true-differential ECG channel digitization and on-die temperature sensing for real-time gain/offset correction. Use Value: 12-bit resolution with ±1 LSB linearity meets IEC 60601-2-27 requirements; low 1.75mA active current extends battery runtime. |
| Automated Test Equipment (ATE) | Energy Meter Data Logging |
Use Scenario: Modular ATE slot card capturing transient waveforms from multiple DUTs under varying thermal conditions. IC Role / Device Role / Timing Role: High-speed 300ksps sampling with external clock synchronization, leveraging FIFO to absorb µP latency during burst reads. Use Value: Full-power bandwidth of 1MHz allows accurate undersampling of harmonics up to 500kHz; SPI interface simplifies FPGA integration. |
Use Scenario: Smart meter front-end digitizing voltage/current transformers and monitoring internal PCB temperature for self-diagnostics. IC Role / Device Role / Timing Role: Dual-role device: primary ADC for metrology channels and secondary thermal sensor for drift compensation and fault detection. Use Value: Internal 2.5V reference stability (±30ppm/°C) reduces long-term calibration drift; unipolar/bipolar mode supports CT/PT polarity detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPW | 16-bit resolution, 500ksps, integrated PGA, no on-chip temp sensor, SPI-only interface | Better resolution and speed but lacks embedded temperature sensing and FIFO; requires external reference and PGA configuration | Select when higher dynamic range is critical and system-level thermal monitoring is handled separately. |
| AD7949BCPZ-RL7 | 14-bit resolution, 250ksps, 8-channel, no FIFO, no internal temp sensor, external reference required | Lower channel count and no on-chip FIFO or temperature sensor; relies on external reference and µP for sequencing | Choose for cost-sensitive designs where 14-bit performance suffices and thermal monitoring is omitted. |
Compared with ADS8688IPW and AD7949BCPZ-RL7, the MAX1231BETI+T uniquely combines 12-bit precision, 16-channel flexibility, integrated FIFO, and calibrated temperature sensing in a single +3V supply device-reducing BOM count and firmware complexity in compact embedded systems.
Availability
MAX1231BETI+T is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, automated test equipment, and energy meter data logging requiring stable component supply across extended temperature ranges.
Supply support for MAX1231BETI+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 MAX1227/MAX1229/MAX1231 product line targets high-accuracy, low-power data acquisition systems requiring integrated signal conditioning, multichannel scanning, and on-die thermal awareness-without external references or timing components.
FAQ
What is the operating temperature range for the MAX1231BETI+T?
The MAX1231BETI+T is specified over the extended industrial temperature range of –40°C to +85°C. This rating applies to all electrical characteristics including INL/DNL, reference voltage stability, temperature sensor accuracy, and FIFO operation. The device maintains ±1 LSB linearity and ±0.7°C temperature measurement accuracy at +25°C, with ±1.2°C error across the full range.
Does the MAX1231BETI+T require an external reference voltage?
No, the MAX1231BETI+T includes a factory-trimmed internal 2.5V reference (2.48V to 2.52V) with ±30ppm/°C temperature coefficient and 200µVRMS noise. External reference operation is optional via REF+ and REF− pins, supporting differential inputs from 1.0V to VDD+50mV. Temperature measurements always use the internal reference regardless of voltage conversion mode.
How many analog input channels does the MAX1231BETI+T support in differential mode?
The MAX1231BETI+T supports eight true differential input pairs: AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, AIN6/AIN7, AIN8/AIN9, AIN10/AIN11, AIN12/AIN13, and AIN14/AIN15. All 16 pins are accessible in the 28-pin TQFN package. Differential mode is configured via the setup register's DIFFSEL bits and requires proper pairing per the datasheet's Table 3.
What is the function of the FIFO in the MAX1231BETI+T?
The MAX1231BETI+T contains a 16-entry first-in/first-out buffer that stores ADC conversion results-including one dedicated slot for temperature measurements. This FIFO decouples analog acquisition from serial data retrieval, allowing continuous scanning (e.g., 16-channel burst) without µP intervention. When full, new conversions overwrite oldest entries, ensuring real-time data flow in time-critical logging applications.
Can the MAX1231BETI+T operate with a 5V supply?
No, the MAX1231BETI+T is designed exclusively for +2.7V to +3.6V single-supply operation. Absolute maximum ratings specify VDD to GND stress limit of –0.3V to +6V, but functional operation outside the 2.7–3.6V range is not guaranteed. Supply current, reference accuracy, INL/DNL, and temperature sensor performance are all characterized and specified only within this range.
MAX1231BETI+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:
- 12
- 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:
- -
MAX1231BETI+T FAQ
1.How can I place an order for MAX1231BETI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1231BETI+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 MAX1231BETI+T reliable?
The price and inventory of MAX1231BETI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1231BETI+T is usually 5 days.
3.What payment methods are accepted for MAX1231BETI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1231BETI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1231BETI+T?
MAX1231BETI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1231BETI+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 MAX1231BETI+T?
For technical support, including MAX1231BETI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1231BETI+T requirements.
6.How does Aetrix verify that MAX1231BETI+T is sourced from the original manufacturer or authorized distributors?
All MAX1231BETI+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 MAX1231BETI+T meets industry standards.
7.What is the process for return or replacement of MAX1231BETI+T?
All MAX1231BETI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1231BETI+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 MAX1231BETI+T part is unused and in its original packaging.
Return procedure for MAX1231BETI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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