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Analog Devices Inc./Maxim Integrated MAX1231BETI+
- Part No.:
- MAX1231BETI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX1231BETI+.pdf
- Description:
- IC ADC 12BIT SAR 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,493
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Product details
Overview
The MAX1231BETI+ 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 interfaces via 10MHz SPI/QSPI/MICROWIRE-compatible 3-wire serial port. Designed for system supervision and industrial data acquisition where channel density, on-chip signal conditioning, and thermal monitoring coexist.
For engineers reviewing the MAX1231BETI+ datasheet, MAX1231BETI+ pinout, MAX1231BETI+ application, or MAX1231BETI+ equivalent, this page delivers verified technical context, exact package mapping (28-pin TQFN-EP, 5mm × 5mm), confirmed pin functions, real-world use-value per application, and two validated alternative parts - all grounded in Maxim's official documentation and electrical specifications.
Technical Context
The MAX1231BETI+ implements a fully differential successive-approximation register (SAR) ADC 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 300ksps using SCLK ≤10MHz.
It integrates a dedicated temperature-sensing path referenced to its internal 2.5V reference, delivering 1/8°C resolution in two's complement format. The 16-deep FIFO buffers conversion results and temperature readings independently, decoupling acquisition from serial readout - critical for deterministic timing in embedded control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with no missing codes over temperature. |
| Sampling Rate | 300ksps max (externally clocked) - enables real-time capture of signals up to 100kHz full-linear bandwidth. |
| INL / DNL | ±1 LSB each - ensures monotonicity and <0.025% end-point linearity error for precision measurement. |
| Temp Sensor Accuracy | ±0.7°C at +25°C, ±1.2°C over –40°C to +85°C - supports closed-loop thermal management without external calibration. |
| Reference | Internal 2.48–2.52V (±30ppm/°C TC) - eliminates need for external reference IC and reduces BOM count. |
| Supply Current | 1.75–2.0mA at 300ksps (internal ref), 0.2–5µA shutdown - enables battery-operated or low-power industrial sensing nodes. |
| Digital Interface | 10MHz 3-wire SPI/QSPI/MICROWIRE - compatible with standard microcontroller peripherals without protocol translation. |
Pinout & Package
The MAX1231BETI+ is packaged in a 28-pin, 5mm × 5mm TQFN with exposed pad (EP), RoHS-compliant and lead-free. The exposed pad must be soldered to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN15 | Analog Input Channels | 16 configurable single-ended inputs or 8 true differential pairs; 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). |
| CNVST/AIN15 | Conversion Start / Analog Input | Active-low hardware trigger for scan initiation; dual-function pin - configured via setup register. |
| SCLK, DIN, DOUT, CS | Serial Interface Signals | Standard 3-wire SPI interface: CS enables slave select, SCLK clocks data, DIN/DOUT shift MSB-first at ≤10MHz. |
| EOC | End-of-Conversion Output | Active-low pulse indicates completion of last requested operation; behavior varies by clock mode (e.g., per-scan in mode 01). |
| VDD, GND, EP | Power & Ground | +2.7V to +3.6V supply; EP must be connected to GND for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | ±0.7°C accuracy at +25°C enables direct board-level thermal monitoring without external sensors or compensation routines. |
| 16-Entry FIFO Buffer | Stores up to 16 ADC results plus one temperature reading - allows burst acquisition without CPU intervention or bus contention. |
| Configurable Input Architecture | Single-ended (16 ch) or true differential (8 ch) with unipolar/bipolar selection per pair - supports diverse sensor types (RTDs, thermocouples, strain gauges). |
| AutoShutdown™ Mode | Reduces supply current to ≤5µA during idle periods - extends operational life in portable or energy-constrained systems. |
| Internal 2.5V Reference | 2.48–2.52V output with ±30ppm/°C drift - provides stable scaling for ratiometric measurements and eliminates external reference cost and layout area. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs across 12+ analog channels in PLC-based control cabinets. IC Role / Device Role / Timing Role: Centralized multichannel ADC with FIFO buffering and internal temperature sensing for ambient thermal derating. Use Value: Eliminates need for separate temperature sensor and external reference, reducing component count by ≥3 while maintaining ±0.7°C thermal accuracy. |
Use Scenario: Compact wearable or bedside monitor acquiring ECG leads, respiration impedance, and skin temperature simultaneously. IC Role / Device Role / Timing Role: Low-power, single-supply ADC handling differential biopotential inputs and on-board thermal compensation. Use Value: 16-channel capability with true differential T/H supports 8-lead ECG + temp in one chip; 1mA active current enables >72h battery life at 1ksps. |
| Data Logger for Environmental Sensors | Automated Test Equipment (ATE) Front-End |
Use Scenario: Solar-powered field unit measuring soil moisture, air temp/humidity, and solar irradiance over extended deployments. IC Role / Device Role / Timing Role: High-accuracy ADC with AutoShutdown™ and internal temp sensor for self-calibration and power gating. Use Value: Internal 2.5V reference stability (±30ppm/°C) ensures <0.01% gain drift over operating range, critical for long-term calibration validity. |
Use Scenario: Modular ATE slot card requiring fast, deterministic sampling of DUT analog outputs under programmable trigger conditions. IC Role / Device Role / Timing Role: Hardware-triggered (CNVST) ADC with scan mode and FIFO for synchronized multi-channel capture without CPU polling. Use Value: Scan mode + FIFO enables 16-channel acquisition in <50µs total time, with EOC signaling ready state - improves test throughput by 3× vs. software-controlled reads. |
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 |
|---|---|---|---|
| ADS8688IPWR | 16-bit, 500ksps, 8-channel SAR ADC with internal reference; no integrated temperature sensor; SPI interface. | Higher resolution and speed but lacks on-chip thermal sensing - requires external temp IC for ambient compensation. | Select when absolute precision >12-bit and sampling rate >300ksps are required, and thermal monitoring is handled separately. |
| AD7949BCPZ-RL7 | 14-bit, 250ksps, 8-channel SAR ADC with internal reference; no temperature sensor; pseudo-differential inputs only. | Limited to 8 channels and pseudo-differential mode - cannot perform true differential measurements like MAX1231BETI+. | Choose for cost-sensitive 8-channel applications where true differential capability and onboard temperature sensing are not needed. |
Compared with ADS8688IPWR and AD7949BCPZ-RL7, the MAX1231BETI+ uniquely combines 16 analog inputs, true differential support, integrated ±0.7°C temperature sensing, and FIFO buffering in a single +3V device - making it optimal for space-constrained, thermally aware multichannel acquisition where BOM simplification and deterministic timing are design priorities.
Availability
The MAX1231BETI+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, environmental data logging, automated test equipment front-ends, and system supervision applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1231BETI+ 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 high-performance analog, mixed-signal, and power-management ICs for industrial, medical, communications, and consumer applications.
The MAX1231BETI+ belongs to Maxim's precision data-acquisition family, engineered specifically for multichannel, low-power, thermally aware measurement systems where integration of ADC, FIFO, reference, and temperature sensor reduces system complexity and improves reliability.
FAQ
What is the maximum number of analog input channels supported by the MAX1231BETI+?
The MAX1231BETI+ supports up to 16 single-ended analog input channels (AIN0–AIN15) or 8 true differential input pairs. This is confirmed in the device's General Description and Pin Description sections, which explicitly list AIN12–AIN15 as available only on the MAX1231 variant - distinguishing it from the 8-channel MAX1227 and 12-channel MAX1229.
Does the MAX1231BETI+ require an external reference voltage?
No, the MAX1231BETI+ includes an internal 2.5V reference with ±30ppm/°C temperature coefficient and 2.48–2.52V output range. External reference operation is optional and enabled via the REFSEL bits in the setup register; the internal reference is mandatory for temperature measurements and always active during power-up.
What package type is used for the MAX1231BETI+?
The MAX1231BETI+ is supplied in a 28-pin TQFN package with exposed pad (5mm × 5mm), designated as "TQFN-EP" in Maxim's ordering information and pin configuration diagrams. This differs from the QSOP variants used for MAX1227/MAX1229 and confirms the MAX1231BETI+'s higher channel count and thermal performance requirements.
How does the FIFO buffer function in the MAX1231BETI+?
The MAX1231BETI+ contains a 16-entry FIFO that stores ADC conversion results and temperature readings. Each entry is 2 bytes (MSB first, with four leading zeros). When full, new results overwrite the oldest. After CS goes low, the oldest available byte appears at DOUT - enabling non-blocking acquisition and eliminating serial bus contention during high-speed scanning.
What is the accuracy of the integrated temperature sensor in the MAX1231BETI+?
The MAX1231BETI+'s internal temperature sensor achieves ±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 under "INTERNAL TEMPERATURE SENSOR". It provides 1/8°C resolution in two's complement format and uses the internal 2.5V reference exclusively.
MAX1231BETI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX1231BETI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1231BETI+ 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+ reliable?
The price and inventory of MAX1231BETI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1231BETI+ is usually 5 days.
3.What payment methods are accepted for MAX1231BETI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1231BETI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1231BETI+?
MAX1231BETI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1231BETI+ 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+?
For technical support, including MAX1231BETI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1231BETI+ requirements.
6.How does Aetrix verify that MAX1231BETI+ is sourced from the original manufacturer or authorized distributors?
All MAX1231BETI+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1231BETI+?
All MAX1231BETI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1231BETI+, 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+ part is unused and in its original packaging.
Return procedure for MAX1231BETI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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