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Analog Devices Inc./Maxim Integrated MAX1231BCTI+T
- Part No.:
- MAX1231BCTI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX1231BCTI+T.pdf
- Description:
- IC ADC 12BIT SAR 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,869
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Product details
Overview
MAX1231BCTI+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 supports 16 single-ended or 8 true differential input channels in unipolar/bipolar modes and operates from a +3V supply. It is used in industrial data-acquisition systems requiring simultaneous voltage and temperature monitoring.
For engineers reviewing the MAX1231BCTI+T datasheet, MAX1231BCTI+T pinout, MAX1231BCTI+T application, or MAX1231BCTI+T equivalent, this page delivers verified technical context, exact pin functions for the 28-pin TQFN-EP package, real-world use cases in system supervision and patient monitoring, and two validated alternative ADCs with documented functional and packaging differences.
Technical Context
The MAX1231BCTI+T implements a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, supporting both single-ended and true differential acquisition. Its internal oscillator enables autonomous scan mode operation without external timing control.
It integrates a dedicated temperature-sensing path using the same internal reference and conversion core, delivering 1/8°C resolution in two's complement format. The 16-deep FIFO buffers voltage and temperature results independently, allowing burst acquisition without serial bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization |
| Max Sampling Rate | 300ksps - supports real-time capture of fast transients up to 100kHz full-linear bandwidth |
| INL / DNL | ±1 LSB - ensures monotonicity and no missing codes across -40°C to +85°C operating range |
| Temp Sensor Accuracy | ±0.7°C at +25°C - enables direct board-level thermal monitoring without calibration |
| Reference | Internal 2.48–2.52V - eliminates need for external reference component and associated layout area |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE - compatible with standard microcontroller peripherals without protocol translation |
| Supply Current | 1.75–2.0mA at 300ksps - enables low-power operation in battery-backed or energy-constrained systems |
Pinout & Package
MAX1231BCTI+T is housed in a 28-pin 5mm × 5mm TQFN package with exposed pad (EP), requiring connection to GND for thermal and electrical performance. Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN15 | Analog Input Channels | 16 configurable inputs; each may serve as single-ended channel or differential pair (e.g., AIN0/AIN1); AIN12–AIN15 available only on MAX1231 |
| REF+/REF- | Reference Inputs | REF+ accepts 1.0V to VDD+50mV; REF- serves as negative reference or analog input (AIN14/AIN10/AIN6 depending on variant) |
| CNVST/AIN15 | Conversion Start / Analog Input | Active-low trigger for externally timed conversions; multiplexed with AIN15 - only one function active per configuration |
| SCLK, DIN, DOUT, CS | Serial Interface Signals | 3-wire SPI-compatible interface; SCLK supports up to 10MHz; DOUT valid on falling edge; CS enables tri-state output |
| EOC | End-of-Conversion Flag | Active-low open-drain output indicating completion of last requested operation; 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 autonomous multi-channel scanning without CPU intervention; prevents data loss during serial bus contention |
| Integrated temperature sensor | Delivers calibrated die temperature readings with ±0.7°C accuracy at +25°C and 1/8°C resolution - no external sensor required |
| Configurable input topology | Supports 16 SE or 8 true differential channels; unipolar/bipolar mode selection per pair via setup register - simplifies mixed-signal front-end design |
| AutoShutdown™ | Reduces supply current to ≤5µA in shutdown state - extends battery life in portable instrumentation and remote sensors |
| Internal 2.5V reference | Stable ±30ppm/°C TC, 200µVRMS noise - eliminates BOM cost and layout complexity of external reference ICs |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of thermocouple outputs, pressure transducer voltages, and ambient temperature in PLC-based control cabinets. IC Role / Device Role / Timing Role: Central ADC managing 12+ analog sensors with synchronized sampling and on-device temperature compensation. Use Value: Single-chip integration of 16-channel scanning, FIFO buffering, and on-die thermal sensing reduces system latency and eliminates external reference drift errors. |
Use Scenario: Multi-parameter bedside monitor acquiring ECG leads, SpO₂ analog signals, and patient skin temperature. IC Role / Device Role / Timing Role: High-accuracy, low-noise ADC with true differential inputs rejecting common-mode interference from medical-grade isolation barriers. Use Value: ±1 LSB INL/DNL and 71dB SINAD ensure diagnostic-grade waveform fidelity; internal temp sensor validates sensor probe health in real time. |
| Data Logger for Environmental Sensing | Automated Test Equipment (ATE) Front End |
Use Scenario: Solar-powered field unit measuring soil moisture, air humidity, and enclosure temperature over extended duty cycles. IC Role / Device Role / Timing Role: Low-power ADC operating from 3V coin cell; uses AutoShutdown™ between 10s-interval conversions. Use Value: 1.75mA active current and ≤5µA shutdown current maximize battery service life; internal reference avoids calibration drift across temperature extremes. |
Use Scenario: Modular ATE slot card digitizing multiple DUT signals including power rail margins and thermal feedback loops. IC Role / Device Role / Timing Role: High-throughput ADC supporting 300ksps burst mode with FIFO-driven DMA transfers to host controller. Use Value: 16-deep FIFO decouples conversion timing from host readout latency; SPI interface enables deterministic command-response sequencing. |
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 |
|---|---|---|---|
| ADS8684IPWR | 16-bit resolution, SAR architecture, 500ksps, internal reference, but no integrated temperature sensor; requires external temp IC for thermal monitoring | Higher precision voltage measurement only; unsuitable where on-die temperature correlation with analog channels is required | Select when absolute voltage accuracy >12-bit is critical and thermal sensing is handled separately |
| AD7949BCPZ-RL7 | 14-bit, 250ksps, SPI interface, no FIFO, no internal temp sensor; supports 8-channel SE or 4-channel diff; requires external reference or reference buffer | Lacks autonomous scanning and thermal awareness; demands host-controlled sequencing and external thermal management | Choose for cost-sensitive, lower-resolution applications where FIFO and integrated temp are nonessential |
Compared with ADS8684IPWR and AD7949BCPZ-RL7, the MAX1231BCTI+T uniquely combines 12-bit precision, 16-channel flexibility, on-chip FIFO, and calibrated die temperature sensing in a single +3V device - eliminating four external components (reference, temp sensor, FIFO buffer, level shifter) in space-constrained designs.
Availability
MAX1231BCTI+T is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, environmental data logging, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for MAX1231BCTI+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 highly integrated, low-power ADCs with built-in intelligence - targeting compact, self-contained data-acquisition systems needing simultaneous voltage and temperature measurement without external support components.
FAQ
What is the operating temperature range for the MAX1231BCTI+T?
The MAX1231BCTI+T is specified for operation from -40°C to +85°C. This extended industrial temperature range is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet, and applies to all performance parameters including INL, DNL, reference stability, and temperature sensor accuracy.
Does the MAX1231BCTI+T require an external reference voltage?
No, the MAX1231BCTI+T includes a factory-trimmed internal 2.5V reference (2.48V to 2.52V) with ±30ppm/°C temperature coefficient. External reference operation is optional via REF+ and REF- pins, but the internal reference is always used for temperature measurements and is sufficient for most precision applications.
How many analog input channels does the MAX1231BCTI+T support?
The MAX1231BCTI+T supports 16 single-ended analog input channels (AIN0–AIN15) or 8 true differential pairs (e.g., AIN0/AIN1 through AIN14/AIN15). This is explicitly stated in the General Description and confirmed in the Pin Description table, distinguishing it from the 8-channel MAX1227 and 12-channel MAX1229 variants.
What package type is used for the MAX1231BCTI+T?
The MAX1231BCTI+T is supplied in a 28-pin 5mm × 5mm TQFN package with exposed pad (EP). The "T" in the part number denotes TQFN, and the datasheet confirms this is the only package offered for the MAX1231 - unlike the MAX1227/MAX1229 which are QSOP-only.
Can the MAX1231BCTI+T perform simultaneous sampling of multiple channels?
No, the MAX1231BCTI+T uses a single SAR ADC core with a multiplexed input structure and does not support true simultaneous sampling. It performs sequential conversions per channel or differential pair, with typical acquisition time of 0.6µs and conversion time of 2.7µs under external clocking - enabling rapid interleaved acquisition but not concurrent sampling.
MAX1231BCTI+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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-TQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1231BCTI+T FAQ
1.How can I place an order for MAX1231BCTI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1231BCTI+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 MAX1231BCTI+T reliable?
The price and inventory of MAX1231BCTI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1231BCTI+T is usually 5 days.
3.What payment methods are accepted for MAX1231BCTI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1231BCTI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1231BCTI+T?
MAX1231BCTI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1231BCTI+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 MAX1231BCTI+T?
For technical support, including MAX1231BCTI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1231BCTI+T requirements.
6.How does Aetrix verify that MAX1231BCTI+T is sourced from the original manufacturer or authorized distributors?
All MAX1231BCTI+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 MAX1231BCTI+T meets industry standards.
7.What is the process for return or replacement of MAX1231BCTI+T?
All MAX1231BCTI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1231BCTI+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 MAX1231BCTI+T part is unused and in its original packaging.
Return procedure for MAX1231BCTI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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