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Analog Devices Inc./Maxim Integrated MAX1231BCEG+T
- Part No.:
- MAX1231BCEG+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1231BCEG+T.pdf
- Description:
- IC ADC 12BIT SAR 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,272
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Product details
Overview
MAX1231BCEG+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 16-channel analog input multiplexer supporting true differential or single-ended configurations in unipolar/bipolar modes. It operates from a +3V supply and targets precision data acquisition in industrial control and patient monitoring systems.
For engineers reviewing the MAX1231BCEG+T datasheet, MAX1231BCEG+T pinout, MAX1231BCEG+T application, or MAX1231BCEG+T equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated package and pin mapping, confirmed alternative options, and supply-chain support details specific to the MAX1231BCEG+T - not generic ADC families.
Technical Context
The MAX1231BCEG+T uses a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, enabling simultaneous high-accuracy voltage and temperature digitization. Its internal oscillator supports clock modes 00/01/10 (4.4MHz ±10%), while externally clocked mode (CKSEL=11) enables full 300ksps sampling with 10MHz SPI-compatible interface timing.
It implements configurable scan sequencing, internal averaging (up to 8 samples), and AutoShutdown™ - reducing supply current to 0.2–5µA in shutdown. All 16 analog inputs (AIN0–AIN15) are software-selectable as single-ended or true differential pairs (e.g., AIN0/AIN1, AIN14/AIN15), with dedicated REF+/REF− pins supporting external differential reference or internal 2.5V reference operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB INL/DNL accuracy (±1 LSB) with no missing codes over -40°C to +85°C. |
| Sampling Rate | 300ksps max (externally clocked) - supports real-time capture of signals up to 100kHz full-linear bandwidth. |
| Input Channels | 16 single-ended or 8 true differential - enables flexible sensor array interfacing without external MUX. |
| Internal Reference | 2.50V ±20mV (±30ppm/°C TC) - eliminates need for external reference in cost-sensitive designs. |
| Temperature Sensor | ±0.7°C accuracy at +25°C, ±1.2°C over full range - provides calibrated on-die thermal monitoring independent of ADC conversions. |
| Digital Interface | 10MHz 3-wire SPI/QSPI/MICROWIRE - compatible with standard microcontroller peripherals; supports CPOL/CPHA = 0 or 1. |
| Supply Current | 1.75–2.0mA at 300ksps (internal ref); 1.05–1.2mA (external ref) - enables low-power battery-operated data loggers. |
| FIFO Depth | 16 entries + 1 temp result - buffers sequential conversions, freeing host MCU from tight timing constraints. |
Pinout & Package
The MAX1231BCEG+T is packaged in a 28-pin 5mm × 5mm TQFN with exposed pad (EP), requiring EP connection to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN15 | Analog Input Channels | 16 configurable inputs; each can be assigned as single-ended or paired differentially (e.g., AIN0/AIN1); AIN12–AIN15 available only on MAX1231. |
| REF+/REF− | Reference Inputs | Accept internal 2.5V reference or external differential reference (0–500mV on REF−, 1.0–VDD+50mV on REF+). |
| CNVST/AIN15 | Conversion Start / Analog Input | Active-low hardware trigger for conversion start; dual-function pin - configured as CNVST or AIN15 via setup register. |
| SCLK, DIN, DOUT, CS | Serial Interface | Standard 3-wire SPI-compatible interface; DOUT active on falling SCLK edge; CS enables tri-state output when high. |
| EOC | End-of-Conversion Flag | Active-low open-drain signal indicating valid data ready; behavior varies by clock mode (e.g., pulses per conversion in mode 01). |
| VDD, GND, EP | Power & Ground | +2.7V to +3.6V supply; EP must be soldered to PCB ground plane for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Enables burst-mode acquisition of up to 16 channel results plus temperature reading without host intervention. |
| True differential track-and-hold | Rejects common-mode noise and DC offsets in sensor interfaces; supports bipolar (±VREF/2) or unipolar (0–VREF) ranges. |
| Internal temperature sensor | Calibrated die-temperature measurement with 1/8°C resolution and ±0.7°C error at +25°C - usable without external components. |
| AutoShutdown™ mode | Reduces IDD to ≤5µA between conversions - extends battery life in portable instrumentation and remote sensors. |
| Configurable clock modes | Four CKSEL settings enable hardware-triggered (CNVST), internally timed, or externally clocked operation - adapts to system timing constraints. |
| Scan and averaging engine | Performs automatic multi-channel scanning and programmable averaging (1–8 samples) - improves SNR without firmware overhead. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
|
Use Scenario: Continuous logging of thermocouple, RTD, and pressure transducer outputs across 16 sensor nodes in a PLC cabinet. IC Role / Device Role / Timing Role: Centralized 12-bit ADC with integrated FIFO and temperature compensation, synchronizing multi-channel sampling via CNVST pulse. Use Value: Eliminates external reference and signal conditioning for 12+ channels; 300ksps throughput supports 10kHz anti-aliasing filter cutoffs. |
Use Scenario: Compact ECG/SpO₂ monitor acquiring lead voltages, skin temperature, and ambient sensor data simultaneously. IC Role / Device Role / Timing Role: Single-chip analog front-end performing true-differential ECG channel digitization and on-die temperature calibration. Use Value: Internal 2.5V reference and ±0.7°C temp sensor reduce BOM count; low 1.75mA active current extends wearable device runtime. |
| Data Logging in Harsh Environments | Automated Test Equipment (ATE) |
|
Use Scenario: Ruggedized field recorder capturing vibration, strain gauge, and environmental sensor data in oil/gas wellheads (-40°C to +85°C). IC Role / Device Role / Timing Role: High-reliability ADC with guaranteed no-missing-codes performance and AutoShutdown between 100ms sample intervals. Use Value: Extended temperature rating and ±1 LSB linearity ensure traceable measurements without recalibration across operating range. |
Use Scenario: Modular ATE slot card performing rapid parametric testing of analog ICs using multi-point voltage sweeps. IC Role / Device Role / Timing Role: High-speed 300ksps digitizer with programmable scan sequencing and internal averaging for repeatable test repeatability. Use Value: Hardware-configurable clock modes (CKSEL=11) enable deterministic 3.33µs conversion time; FIFO prevents data loss during bus arbitration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit, 1MSPS, 16-channel, SPI interface, no internal temp sensor or FIFO; requires external reference. | Lacks integrated temperature sensing and FIFO buffering - demands additional ICs for thermal monitoring and burst acquisition. | Choose for higher speed (1MSPS) where FIFO/temp sensor are handled externally; not drop-in due to missing features. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, SPI, internal reference only (no temp sensor); 24-TSSOP package. | Offers faster sampling but omits on-die temperature measurement and FIFO - unsuitable for self-calibrating systems. | Select when maximum throughput is critical and thermal compensation is implemented separately; differs in pinout and feature set. |
Compared with ADS7953IRHBT and AD7490BRUZ, the MAX1231BCEG+T uniquely integrates temperature sensing, FIFO buffering, and AutoShutdown in a single 28-pin TQFN - reducing system-level component count and firmware complexity for embedded data acquisition.
Availability
MAX1231BCEG+T is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, data logging in harsh environments, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for MAX1231BCEG+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 delivers integrated, low-power, multichannel ADCs with on-die temperature sensing and FIFO - engineered specifically for space-constrained, high-channel-count data acquisition systems needing minimal external components.
FAQ
What is the maximum sampling rate supported by the MAX1231BCEG+T?
The MAX1231BCEG+T achieves a maximum sampling rate of 300ksps when operated in externally clocked mode (CKSEL1/CKSEL0 = 11) with SCLK up to 10MHz. In internally clocked modes (00, 01, 10), the effective rate is lower due to oscillator tolerance and conversion overhead; typical sustained throughput is ~250ksps. The MAX1231BCEG+T datasheet specifies 300ksps as the absolute maximum under defined timing conditions.
Does the MAX1231BCEG+T require an external reference voltage?
No, the MAX1231BCEG+T includes a factory-trimmed 2.50V internal reference with ±20mV initial accuracy and ±30ppm/°C temperature coefficient - sufficient for most precision applications. An external differential reference may be used via REF+ and REF− pins if tighter drift or custom full-scale range is required, but it is not mandatory. The MAX1231BCEG+T functions fully with internal reference enabled.
How many analog input channels does the MAX1231BCEG+T support, and what configurations are available?
The MAX1231BCEG+T supports 16 analog input channels (AIN0–AIN15), configurable as either 16 single-ended inputs or 8 true differential pairs (e.g., AIN0/AIN1, AIN14/AIN15). Channel assignment is controlled via the setup and conversion registers. Unlike MAX1227/MAX1229, only the MAX1231BCEG+T provides access to AIN12–AIN15 - confirming its 16-channel capability in both modes.
What is the accuracy of the internal temperature sensor in the MAX1231BCEG+T?
The MAX1231BCEG+T internal temperature sensor has ±0.7°C accuracy at +25°C and ±1.2°C over the full -40°C to +85°C operating range, as specified in the Electrical Characteristics table. It provides 1/8°C resolution in two's complement format and always uses the internal 2.5V reference - ensuring consistent calibration independent of external reference selection.
Is the MAX1231BCEG+T pin-compatible with other devices in the MAX1227/MAX1229/MAX1231 family?
No - the MAX1231BCEG+T is only available in 28-pin TQFN and 24-pin QSOP packages, whereas MAX1227/MAX1229 are offered exclusively in smaller QSOP variants (16-/20-pin). Pin counts, layouts, and channel mappings differ significantly; for example, AIN12–AIN15 and associated control bits exist only on MAX1231BCEG+T. Direct PCB replacement is not possible without layout revision.
MAX1231BCEG+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1231BCEG+T FAQ
1.How can I place an order for MAX1231BCEG+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1231BCEG+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 MAX1231BCEG+T reliable?
The price and inventory of MAX1231BCEG+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1231BCEG+T is usually 5 days.
3.What payment methods are accepted for MAX1231BCEG+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1231BCEG+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1231BCEG+T?
MAX1231BCEG+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1231BCEG+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 MAX1231BCEG+T?
For technical support, including MAX1231BCEG+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1231BCEG+T requirements.
6.How does Aetrix verify that MAX1231BCEG+T is sourced from the original manufacturer or authorized distributors?
All MAX1231BCEG+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 MAX1231BCEG+T meets industry standards.
7.What is the process for return or replacement of MAX1231BCEG+T?
All MAX1231BCEG+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1231BCEG+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 MAX1231BCEG+T part is unused and in its original packaging.
Return procedure for MAX1231BCEG+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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