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Analog Devices Inc./Maxim Integrated MAX1240BESA+T
- Part No.:
- MAX1240BESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240BESA+T.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,309
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Product details
Overview
MAX1240BESA+T from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (ADC) with internal 2.5V reference, 73ksps throughput, 7.5µs conversion time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for precision data acquisition in space-constrained, battery-powered sensor systems.
For engineers reviewing the MAX1240BESA+T datasheet, MAX1240BESA+T pinout, MAX1240BESA+T application, or MAX1240BESA+T equivalent, this page delivers verified electrical specs, thermal performance across -40°C to +85°C, shutdown current of ≤2µA, INL of ±1 LSB, and SO-8 package compatibility - all critical for remote instrumentation and isolated measurement designs.
Technical Context
The MAX1240BESA+T integrates a track/hold circuit with 1.5µs acquisition time and a 12-bit SAR core, operating from a single +2.7V to +3.6V supply. Its internal 2.5V reference is trimmed to ±30ppm/°C and bypassed with 4.7µF, enabling stable conversions without external reference components.
It uses an unipolar serial output format with MSB-first timing, where DOUT transitions on SCLK falling edge and signals end-of-conversion (EOC) via rising edge. The device supports full-speed readout up to 2.1MHz while maintaining 70dB SINAD and 80dB SFDR at 10kHz input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale range |
| Throughput Rate | 73ksps - enables real-time sampling of signals up to ~36.5kHz Nyquist bandwidth |
| INL (Integral Nonlinearity) | ±1 LSB - ensures monotonicity and <0.024% full-scale error for calibration-sensitive applications |
| Supply Voltage Range | +2.7V to +3.6V - compatible with Li-ion and 3.3V logic rails without level-shifting |
| Shutdown Current | ≤2µA - reduces average power to µW-level during idle intervals in battery-operated systems |
| SINAD | 70dB - supports >11.3 effective number of bits (ENOB) for high-fidelity signal capture |
| Reference | Internal 2.5V ±0.5% - eliminates need for external reference IC and associated layout complexity |
Pinout & Package
MAX1240BESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+T suffix), with 1.27mm pitch and JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog/digital sections and internal reference |
| AIN (Pin 2) | Analog input | 0V to VREF single-ended input; 16pF input capacitance requires low-Z source or external 0.01µF filter |
| SHDN (Pin 3) | Three-level shutdown control | Pulled high → enables internal 2.5V reference; open → disables reference for external use; low → enters ≤2µA shutdown |
| REF (Pin 4) | Reference voltage node | Outputs 2.5V (MAX1240) or accepts external VREF (1.0V–VDD); bypassed with 4.7µF for stability |
| GND (Pin 5) | Analog/digital ground | Single-point star ground connection required; separates analog and digital return paths |
| CS (Pin 6) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode |
| DOUT (Pin 7) | Serial data output | MSB-first unipolar format; EOC signaled by rising edge; transitions on SCLK falling edge |
| SCLK (Pin 8) | Serial clock input | Accepts up to 2.1MHz; duty cycle unrestricted if each phase ≥200ns; must be held low during conversion |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Operates from +2.7V to +3.6V only - eliminates dual-rail design overhead and simplifies power architecture |
| Integrated track/hold | 1.5µs acquisition time with no external hold capacitor - reduces BOM count and PCB area |
| 3-wire serial interface | Compatible with SPI™, QSPI™, and MICROWIRE™ protocols using only CS, SCLK, DOUT - minimizes GPIO usage on microcontrollers |
| Internal 2.5V reference | Trimmed to ±0.5% initial accuracy and ±30ppm/°C drift - enables self-contained operation without reference IC or trimming |
| Low-power shutdown | Reduces supply current to ≤2µA while preserving configuration - extends battery life in intermittent-sampling applications |
Applications
| Battery-Powered Sensor Node | Portable Data Logger |
|---|---|
Use Scenario: Continuous temperature/humidity monitoring in field-deployed IoT nodes powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from precision sensors at 1–10ksps, synchronized via microcontroller's SPI master. Use Value: 2µA shutdown current and 37mW active power at 73ksps enable multi-year operation; internal reference avoids drift-induced calibration drift. |
Use Scenario: Handheld environmental logger capturing voltage, current, and thermocouple readings during field surveys. IC Role / Device Role / Timing Role: High-accuracy front-end ADC interfacing to MCU via 3-wire serial bus; samples triggered on button press or timer interrupt. Use Value: ±1 LSB INL and 70dB SINAD ensure traceable measurements per IEC 61000-4-30 Class A; SO-8 package fits compact handheld PCBs. |
| Isolated Industrial Data Acquisition | Process Control Transmitter |
Use Scenario: Analog input module in PLC backplane with galvanic isolation between field-side sensors and controller-side digital bus. IC Role / Device Role / Timing Role: Isolated-side ADC converting 4–20mA loop-derived voltages; communicates across digital isolator to host processor. Use Value: Internal 2.5V reference eliminates need for isolated reference supply; 1.5µs track/hold supports fast step-response capture after isolation delay. |
Use Scenario: Smart transmitter housing pressure/flow sensors with HART modulation capability and local diagnostics. IC Role / Device Role / Timing Role: Precision ADC feeding microcontroller for linearization, temperature compensation, and digital output generation. Use Value: ±30ppm/°C reference TC and 80dB SFDR support 0.1% FS accuracy over -40°C to +85°C ambient; SO-8 allows conformal coating for harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply; no internal reference; 12-bit, 200ksps; requires external REF and REF decoupling | Higher speed but demands external reference design and tighter layout for noise immunity | Select when higher throughput is needed and external reference infrastructure already exists |
| MAX11100ETE+ | 12-bit, 1MSPS; internal 2.048V reference; 14-pin TDFN; SPI-only interface; higher power (2.5mA active) | Targets high-speed industrial control; larger package and higher quiescent current limit portable use | Select when >100ksps sampling and smaller TDFN footprint outweigh power and cost trade-offs |
Compared with ADS7822U and MAX11100ETE+, the MAX1240BESA+T offers optimal balance of ultra-low shutdown current (≤2µA), integrated 2.5V reference, SO-8 footprint, and guaranteed ±1 LSB INL - making it uniquely suited for long-life, space-constrained, self-contained sensor interfaces.
Availability
MAX1240BESA+T is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, and isolated data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1240BESA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX1240 series belongs to Maxim's precision data acquisition product line, engineered specifically for low-power, small-footprint 12-bit ADC applications in remote and portable instrumentation where reference integration and supply flexibility are critical.
FAQ
What is the operating temperature range for MAX1240BESA+T?
The MAX1240BESA+T is rated for operation from -40°C to +85°C, meeting industrial-grade requirements. This range is confirmed in the Ordering Information table (suffix "E" = -40°C to +85°C) and validated across all DC and AC specifications including INL, gain error, and reference stability in the Electrical Characteristics section.
Does MAX1240BESA+T require an external reference?
No - the MAX1240BESA+T includes a factory-trimmed 2.5V internal reference with ±0.5% initial accuracy and ±30ppm/°C temperature coefficient. It is enabled by pulling SHDN high; leaving SHDN open disables the internal reference and allows external reference use, but it is not required.
What is the minimum acquisition time for MAX1240BESA+T?
The guaranteed maximum acquisition time (tACQ) for MAX1240BESA+T is 1.5µs, as specified in the Timing Characteristics table. This value is valid for source impedances ≤1kΩ; higher impedances increase tACQ per the formula tACQ = 9(RS + 9kΩ) × 16pF.
Can MAX1240BESA+T interface directly with an SPI master?
Yes - the MAX1240BESA+T supports SPI™, QSPI™, and MICROWIRE™ protocols. It requires CPOL = 0 and CPHA = 0, uses CS falling edge to initiate conversion, and outputs MSB-first data on DOUT with transitions aligned to SCLK falling edge - fully compatible with standard SPI controllers.
What is the typical power consumption of MAX1240BESA+T at 73ksps?
At 73ksps and VDD = 3V, the MAX1240BESA+T consumes 37mW (12.3mA), as stated in the General Description. This includes both analog and digital circuitry; power drops to ≤2µA in shutdown mode, reducing average consumption significantly in duty-cycled applications.
MAX1240BESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 73k
- Number of Inputs:
- 1
- Input Type:
- 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:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1240BESA+T FAQ
1.How can I place an order for MAX1240BESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240BESA+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 MAX1240BESA+T reliable?
The price and inventory of MAX1240BESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240BESA+T is usually 5 days.
3.What payment methods are accepted for MAX1240BESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240BESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240BESA+T?
MAX1240BESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240BESA+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 MAX1240BESA+T?
For technical support, including MAX1240BESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240BESA+T requirements.
6.How does Aetrix verify that MAX1240BESA+T is sourced from the original manufacturer or authorized distributors?
All MAX1240BESA+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 MAX1240BESA+T meets industry standards.
7.What is the process for return or replacement of MAX1240BESA+T?
All MAX1240BESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240BESA+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 MAX1240BESA+T part is unused and in its original packaging.
Return procedure for MAX1240BESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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