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Analog Devices Inc./Maxim Integrated MAX1231BEEG+T
- Part No.:
- MAX1231BEEG+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1231BEEG+T.pdf
- Description:
- IC ADC 12BIT SAR 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,818
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Product details
Overview
MAX1231BEEG+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 MAX1231BEEG+T datasheet, MAX1231BEEG+T pinout, MAX1231BEEG+T application, or MAX1231BEEG+T equivalent, this device delivers verified 12-bit DC accuracy (±1 LSB INL/DNL), on-chip track-and-hold, internal clock mode, AutoShutdown™, and extended -40°C to +85°C operation - critical for embedded monitoring and precision sensor interfacing.
Technical Context
The MAX1231BEEG+T employs a fully differential successive-approximation register (SAR) architecture with integrated track-and-hold, supporting both single-ended and true differential inputs across 16 configurable analog channels. Its internal oscillator (nominal 4.4MHz, ±10%) enables autonomous conversion timing in clock modes 00/01/10, while external SCLK up to 10MHz drives high-speed serial I/O.
Conversion control is managed via a programmable setup register that configures reference source (internal 2.5V or external differential), input polarity (unipolar/bipolar), clock mode, and power-down behavior. The 16-deep FIFO buffers ADC results and temperature readings independently, decoupling acquisition from host readout and enabling burst-mode sampling without bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB integral nonlinearity (INL) and no missing codes over temperature for calibrated measurement systems. |
| Sampling Rate | 300ksps max with external clock - enables real-time capture of signals up to 100kHz full-linear bandwidth. |
| Input Channels | 16 single-ended or 8 true differential - supports flexible sensor multiplexing in compact industrial I/O modules. |
| Internal Reference | 2.50V ±20mV (±30ppm/°C TC) - eliminates need for external reference in cost-sensitive designs; used for all temperature measurements. |
| Temperature Sensor | ±0.7°C accuracy at +25°C, ±1.2°C over -40°C to +85°C - provides direct board-level thermal monitoring without external components. |
| Supply Current | 1.75mA at 300ksps (internal ref), 0.5µA in AutoShutdown™ - enables battery-backed or low-power remote sensing applications. |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE-compatible 3-wire - interoperates with standard microcontroller peripherals without level-shifting. |
Pinout & Package
The MAX1231BEEG+T is packaged in a 28-pin 5mm × 5mm TQFN with exposed pad (EP), requiring connection of EP to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN15 | Analog Input Channels | 16 configurable single-ended or differential inputs; AIN12–AIN15 available only on MAX1231; channel mapping defined by 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 always powers temperature sensor. |
| CNVST/AIN15 | Active-Low Conversion Start / Analog Input | Configurable function: pulse-low to trigger conversion in clock modes 00/01; when assigned as AIN15, disables CNVST functionality. |
| SCLK, DIN, DOUT, CS | Serial Interface Signals | 3-wire SPI-compatible interface; DOUT updates on SCLK falling edge; CS enables serial port and controls DOUT tri-state behavior. |
| EOC | End-of-Conversion Output | 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 and Ground | +2.7V to +3.6V single supply; EP must be soldered to GND plane for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Buffers ADC results and temperature readings separately, allowing continuous acquisition while host reads previous data - eliminates timing-critical polling. |
| Internal temperature sensor | ±0.7°C accuracy at +25°C with 1/8°C resolution; uses internal reference exclusively - enables self-contained thermal diagnostics without calibration overhead. |
| Scan mode & internal averaging | Programmable scan sequences (single channel, range, or full set) with up to 8x internal averaging - improves SNR for low-level sensor signals without host CPU intervention. |
| AutoShutdown™ | Reduces supply current to ≤5µA after conversion completes and bus is idle - extends battery life in portable instrumentation and remote sensors. |
| True differential track-and-hold | Supports bipolar/unipolar differential pairs (e.g., AIN0/AIN1, AIN2/AIN3) with common-mode rejection - preserves signal integrity in noisy industrial environments. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of pressure, flow, and temperature signals from multiple transducers in PLC-based control cabinets. IC Role / Device Role / Timing Role: Central ADC hub performing synchronized 16-channel scanning at 10ksps with on-chip averaging to suppress 50/60Hz line noise. Use Value: Eliminates external multiplexer and reference ICs; FIFO enables deterministic data transfer to ARM Cortex-M host without interrupt latency concerns. |
Use Scenario: Compact wearable monitor acquiring ECG, skin temperature, and respiration waveforms with minimal BOM count. IC Role / Device Role / Timing Role: Dual-role sensor interface: digitizes biopotential signals differentially while concurrently measuring local PCB temperature for drift compensation. Use Value: Internal 2.5V reference and ±0.7°C temp sensor enable clinical-grade calibration traceability without discrete reference or thermistor network. |
| Data Logger for Environmental Sensors | Smart Power Supply Supervision |
Use Scenario: Solar-powered field node measuring soil moisture, ambient humidity, and panel temperature across 12 analog inputs. IC Role / Device Role / Timing Role: Low-power acquisition engine using AutoShutdown™ between 1Hz sampling intervals; internal clock mode minimizes MCU wake-up events. Use Value: 0.5µA shutdown current and single +3V operation extend battery life beyond 5 years; FIFO prevents data loss during sporadic RF transmission windows. |
Use Scenario: Real-time voltage/current/temperature monitoring of multi-rail DC-DC converters in telecom base station power modules. IC Role / Device Role / Timing Role: High-accuracy supervisor capturing rail voltages (±0.5% gain error), current-sense amps, and heatsink temp with simultaneous 12-bit resolution. Use Value: ±1 LSB INL/DNL and 71dB SINAD ensure reliable fault detection at <1% threshold margins; SPI interface allows rapid register interrogation during fault escalation. |
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 integrated temp sensor; requires external reference; 32-pin VQFN. | Higher speed but lacks on-chip temperature sensing and internal reference - demands additional components for thermal monitoring. | Select when >300ksps sampling or lower acquisition latency is required, and temperature sensing is handled externally. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, SPI interface; no FIFO; no integrated temp sensor; internal reference optional (not default); 28-pin TSSOP. | Lacks FIFO buffering and temperature sensor - requires host-controlled sequencing and external thermal sensing solution. | Choose for cost-sensitive, high-throughput applications where host processor can manage timing and thermal monitoring is not needed on-chip. |
Compared with ADS7953IRHBT and AD7490BRUZ, the MAX1231BEEG+T uniquely integrates FIFO, temperature sensor, and internal reference in a single 28-pin TQFN - reducing component count and layout area for space-constrained, thermally aware data acquisition systems.
Availability
MAX1231BEEG+T is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, environmental data logging, smart power supply supervision, and embedded system supervision requiring stable component supply across extended temperature ranges.
Supply support for MAX1231BEEG+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 MAX1231BEEG+T belongs to Maxim's high-accuracy, low-power serial ADC product line - engineered specifically for embedded data acquisition where integration of reference, temperature sensing, and FIFO reduces system complexity and improves reliability.
FAQ
What is the operating temperature range specified for the MAX1231BEEG+T?
The MAX1231BEEG+T is specified over the extended industrial temperature range of -40°C to +85°C. This rating applies to all key specifications including DC accuracy (±1 LSB INL/DNL), temperature sensor error (±1.2°C), and FIFO operation. The device maintains full functionality across this range without derating, making it suitable for harsh-environment deployments such as factory automation and outdoor instrumentation.
Does the MAX1231BEEG+T require an external reference voltage?
No, the MAX1231BEEG+T includes a precision internal 2.5V reference (2.48V to 2.52V, ±30ppm/°C TC) that is enabled by default and used for all temperature measurements. An external differential reference may be applied via REF+ and REF− pins if higher accuracy or custom scaling is required, but it is not mandatory. The internal reference eliminates BOM cost and layout area in most applications.
How many analog input channels does the MAX1231BEEG+T support in differential mode?
The MAX1231BEEG+T supports eight true differential input pairs (AIN0/AIN1, AIN2/AIN3, ..., AIN14/AIN15) when configured in differential mode. This capability is exclusive to the MAX1231 variant - the MAX1229 supports six differential pairs and the MAX1227 supports four. Channel selection and differential pairing are controlled entirely through the setup and conversion registers.
What is the purpose of the FIFO buffer in the MAX1231BEEG+T?
The 16-entry FIFO in the MAX1231BEEG+T stores ADC conversion results and temperature readings independently, enabling autonomous burst acquisition without host intervention. It allows the device to perform multiple conversions (including temperature scans) while the host processor handles other tasks, then read out buffered data at its convenience - preventing data loss during high-latency operations like wireless transmission or display updates.
Can the MAX1231BEEG+T operate with a supply voltage lower than +3.0V?
Yes, the MAX1231BEEG+T operates from +2.7V to +3.6V. At +2.7V, it maintains full 12-bit performance including ±1 LSB INL/DNL and 71dB SINAD, with supply current dropping to ~1.5mA at 300ksps. This 2.7V minimum enables compatibility with Li-ion battery systems and low-voltage microcontrollers without level-shifting, while preserving accuracy across the entire specified voltage range.
MAX1231BEEG+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:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1231BEEG+T FAQ
1.How can I place an order for MAX1231BEEG+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1231BEEG+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 MAX1231BEEG+T reliable?
The price and inventory of MAX1231BEEG+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1231BEEG+T is usually 5 days.
3.What payment methods are accepted for MAX1231BEEG+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1231BEEG+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1231BEEG+T?
MAX1231BEEG+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1231BEEG+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 MAX1231BEEG+T?
For technical support, including MAX1231BEEG+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1231BEEG+T requirements.
6.How does Aetrix verify that MAX1231BEEG+T is sourced from the original manufacturer or authorized distributors?
All MAX1231BEEG+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 MAX1231BEEG+T meets industry standards.
7.What is the process for return or replacement of MAX1231BEEG+T?
All MAX1231BEEG+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1231BEEG+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 MAX1231BEEG+T part is unused and in its original packaging.
Return procedure for MAX1231BEEG+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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