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Analog Devices Inc./Maxim Integrated MAX1231AEEG+
- Part No.:
- MAX1231AEEG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1231AEEG+.pdf
- Description:
- IC ADC 12BIT SAR 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,773
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Product details
Overview
The MAX1231AEEG+ 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 multiplexer supporting true differential or single-ended inputs in unipolar/bipolar modes. It operates from a single +3V supply and targets precision data acquisition in industrial control and patient monitoring systems.
For engineers reviewing the MAX1231AEEG+ datasheet, MAX1231AEEG+ pinout, MAX1231AEEG+ application, or MAX1231AEEG+ equivalent, this page delivers verified specifications, package mapping to 28-pin TQFN-EP (5mm × 5mm), confirmed SPI/QSPI/MICROWIRE-compatible interface timing, and validated alternatives for multichannel, low-power, temperature-aware ADC replacement scenarios.
Technical Context
The MAX1231AEEG+ implements a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, enabling simultaneous support for 16 single-ended or 8 true differential input channels. Its internal oscillator (4.4MHz ±10%) drives internally timed conversions in clock modes 00/01/10, while mode 11 supports externally clocked operation up to 10MHz SCLK for 300ksps sampling.
Conversion results are buffered in a 16-deep FIFO plus one dedicated temperature slot, allowing autonomous multi-channel acquisition without serial bus contention. The device uses two's complement format for bipolar and temperature outputs, binary for unipolar, and features AutoShutdown™ reducing supply current to ≤5µA during idle periods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB INL/DNL accuracy with no missing codes over -40°C to +85°C. |
| Sampling Rate | 300ksps max - achievable only with external clock (CKSEL = 11); internal clock limits to ~270ksps. |
| Input Channels | 16 single-ended or 8 true differential - all configurable via setup register; AIN0–AIN15 mapped to physical pins. |
| Internal Reference | 2.50V ±10mV (±30ppm/°C TC) - enables self-contained operation; external differential reference also supported. |
| Temperature Sensor | ±0.7°C error at +25°C, ±1.2°C over full range - provides system-level thermal monitoring without external components. |
| Supply Current | 1.75mA at 300ksps (internal ref), 1.05mA (external ref), 0.2–5µA in shutdown - optimized for battery or low-power embedded use. |
| Digital Interface | 10MHz 3-wire SPI/QSPI/MICROWIRE - compatible with standard microcontroller peripherals; CPOL/CPHA agnostic. |
Pinout & Package
The MAX1231AEEG+ is packaged in a 28-pin TQFN-EP (5mm × 5mm) 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 member (e.g., AIN0/AIN1). |
| REF+/REF- | Reference Inputs | REF+ accepts 1.0V to VDD+50mV; REF- serves as negative reference or alternate analog input (AIN14/AIN10/AIN6). |
| CNVST/AIN15 | Conversion Start / Analog Input | Active-low conversion trigger; when configured as CNVST, AIN15 is disabled - mutually exclusive function. |
| SCLK, DIN, DOUT, CS | Serial Interface Signals | Standard 3-wire SPI interface: CS enables slave, SCLK clocks data, DIN latches on rising edge, DOUT updates on falling edge. |
| EOC | End-of-Conversion Flag | Active-low open-drain output; pulses low after conversion completion in clock modes 00/01/10; always high in mode 11. |
| VDD, GND, EP | Power & Ground | +2.7V to +3.6V supply; EP must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 16-entry FIFO buffer | Enables burst acquisition of up to 16 voltage samples + 1 temperature reading without CPU intervention or bus blocking. |
| True differential track-and-hold | Rejects common-mode noise and DC offsets across all 8 differential pairs (e.g., AIN0/AIN1), preserving signal integrity. |
| Configurable scan & averaging | Supports continuous channel scanning or repeated sampling of one channel (NSCAN1/NSCAN0) with programmable averaging (1–8x). |
| AutoShutdown™ mode | Reduces IDD to ≤5µA automatically after conversion completes and serial bus remains inactive for >100ms. |
| Integrated temperature sensor | Delivers calibrated Celsius readings at 1/8°C resolution in two's complement format - no external sensor or calibration required. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
|
Use Scenario: Real-time monitoring of temperature, pressure, and flow sensors across distributed PLC I/O modules. IC Role / Device Role / Timing Role: Central multichannel ADC capturing synchronized analog data from 12+ sensors with onboard temperature compensation. Use Value: Eliminates external reference and temperature ICs, reducing BOM count and layout area while maintaining ±1 LSB linearity. |
Use Scenario: Portable ECG and SpO₂ monitor acquiring biopotential signals and ambient temperature for clinical-grade accuracy. IC Role / Device Role / Timing Role: Low-noise, low-power ADC digitizing differential electrode inputs and on-board thermal drift correction source. Use Value: Internal FIFO allows gap-free sampling at 250–300ksps while MCU handles display and wireless transmission asynchronously. |
| Data Logging in Harsh Environments | Automated Test Equipment (ATE) |
|
Use Scenario: Battery-powered environmental logger recording temperature, humidity, and voltage levels in remote field deployments. IC Role / Device Role / Timing Role: Primary data converter operating from 3V coin cell, using AutoShutdown™ between 10s-interval measurements. Use Value: 1.05mA active current (external ref) + 0.2µA shutdown extends battery life beyond 5 years at 1 sample/min duty cycle. |
Use Scenario: Modular ATE slot card performing rapid parametric testing of analog ICs and passive components. IC Role / Device Role / Timing Role: High-speed ADC capturing transient response waveforms with precise timing control via external SCLK. Use Value: 300ksps sampling with 71dB SINAD and 81dB SFDR ensures accurate characterization of low-distortion signals up to 100kHz. |
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, 500ksps, SPI interface, no integrated temp sensor, requires external ref. | Better resolution/noise performance but lacks on-chip temperature sensing and FIFO buffering. | Select when higher dynamic range is critical and system already includes thermal monitoring. |
| AD7949BCPZ-RL7 | 14-bit, 250ksps, 16-channel, SPI, internal ref, no temp sensor, 20-lead LFCSP. | Lower power (0.85mA @ 250ksps) and smaller package, but no temperature measurement capability. | Choose for space-constrained designs where thermal compensation is handled externally. |
Compared with the MAX1231AEEG+, the ADS8684IPWR offers superior resolution and speed but removes integrated thermal awareness and autonomous FIFO operation, while the AD7949BCPZ-RL7 trades 2 bits of resolution and 50ksps for reduced footprint and power - neither replicates the combined 12-bit precision, 16-channel flexibility, and on-die temperature sensing of the MAX1231AEEG+.
Availability
The MAX1231AEEG+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, environmental data logging, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for MAX1231AEEG+ 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 was engineered specifically for low-power, multichannel data acquisition systems needing integrated temperature sensing and autonomous FIFO-based sampling - targeting space- and power-constrained embedded platforms.
FAQ
What is the maximum sampling rate achievable with the MAX1231AEEG+?
The MAX1231AEEG+ achieves a maximum sampling rate of 300ksps only when using an external clock (CKSEL = 11). In internally clocked modes (00/01/10), the effective rate is limited by the ±10% tolerance of the 4.4MHz oscillator, typically yielding ~270ksps. The MAX1231AEEG+ datasheet specifies timing parameters including tCONV = 2.7µs and tACQ = 0.6µs under external clock conditions.
Does the MAX1231AEEG+ require an external reference voltage?
No, the MAX1231AEEG+ includes a factory-trimmed 2.50V internal reference with ±10mV initial accuracy and ±30ppm/°C temperature coefficient, sufficient for most precision applications. An external differential reference (applied between REF+ and REF-) can be used instead, offering improved stability if system-level calibration is performed - but the internal reference remains mandatory for temperature measurements.
How many analog input channels does the MAX1231AEEG+ support?
The MAX1231AEEG+ supports 16 single-ended analog inputs (AIN0–AIN15) or 8 true differential input pairs (e.g., AIN0/AIN1, AIN2/AIN3, ..., AIN14/AIN15). Channel availability is physically mapped to pins: AIN0–AIN7 appear on all variants; AIN8–AIN11 are present on MAX1229/MAX1231; AIN12–AIN15 are exclusive to the MAX1231AEEG+.
What is the function of the FIFO in the MAX1231AEEG+?
The MAX1231AEEG+ integrates a 16-deep first-in/first-out (FIFO) buffer that stores ADC conversion results - including up to 16 voltage samples and one temperature reading per acquisition sequence. This allows the device to perform multiple conversions autonomously, freeing the host microcontroller from constant polling and enabling efficient burst-mode data capture without serial bus contention.
Can the MAX1231AEEG+ measure temperature independently of analog input conversions?
Yes, the MAX1231AEEG+ contains a dedicated on-die temperature sensor with ±0.7°C accuracy at +25°C and ±1.2°C over -40°C to +85°C. Temperature measurements are initiated separately via the TEMP bit in the conversion register and return a two's complement value representing degrees Celsius at 1/8°C resolution - independent of analog input channel selection or configuration.
MAX1231AEEG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
MAX1231AEEG+ FAQ
1.How can I place an order for MAX1231AEEG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1231AEEG+ 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 MAX1231AEEG+ reliable?
The price and inventory of MAX1231AEEG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1231AEEG+ is usually 5 days.
3.What payment methods are accepted for MAX1231AEEG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1231AEEG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1231AEEG+?
MAX1231AEEG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1231AEEG+ 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 MAX1231AEEG+?
For technical support, including MAX1231AEEG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1231AEEG+ requirements.
6.How does Aetrix verify that MAX1231AEEG+ is sourced from the original manufacturer or authorized distributors?
All MAX1231AEEG+ 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 MAX1231AEEG+ meets industry standards.
7.What is the process for return or replacement of MAX1231AEEG+?
All MAX1231AEEG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1231AEEG+, 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 MAX1231AEEG+ part is unused and in its original packaging.
Return procedure for MAX1231AEEG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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