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Analog Devices Inc./Maxim Integrated MAX1240BESA/V+T
- Part No.:
- MAX1240BESA/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240BESA/V+T.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,925
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Product details
Overview
The MAX1240BESA/V+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/V+T datasheet, MAX1240BESA/V+T pinout, MAX1240BESA/V+T application, or MAX1240BESA/V+T equivalent, this page delivers verified electrical specs, thermal range (-40°C to +85°C), SO-8 package mapping, shutdown current (2µA), INL (±1 LSB), and real-world interface timing constraints for microcontroller integration.
Technical Context
The MAX1240BESA/V+T employs an internal track-and-hold with 1.5µs acquisition time and a 12-bit SAR architecture clocked by an on-chip oscillator. It operates from a single +2.7V to +3.6V supply and integrates a trimmed 2.5V reference with ±30ppm/°C temperature coefficient.
Its 3-wire serial interface uses unipolar MSB-first output format with end-of-conversion (EOC) signaling via DOUT high transition, supports up to 2.1MHz SCLK, and requires no external hold capacitor. The SHDN pin enables dual-mode operation: high or open for active mode (with internal reference enabled when high), low for 2µA shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale input range |
| Sampling Rate | 73ksps - supports real-time monitoring of signals up to ~36.5kHz Nyquist bandwidth |
| INL (Integral Nonlinearity) | ±1 LSB - ensures monotonicity and <0.024% full-scale error across operating temperature |
| Reference | Internal 2.5V ±0.5% - eliminates external reference component count and layout complexity |
| Supply Current (Active) | 1.6mA at VDD = 3.6V - enables <37mW power draw at max throughput for extended battery life |
| Shutdown Current | 2µA - reduces average system power during idle intervals in duty-cycled sensing |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin environments |
Pinout & Package
MAX1240BESA/V+T is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead(Pb)-free per /V+ suffix, footprint compatible with industry-standard SOIC-8 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive Supply Input | Single +2.7V to +3.6V rail powering analog/digital sections; bypass with 0.1µF + 4.7µF capacitors |
| AIN (Pin 2) | Analog Input | Unipolar 0V to VREF sampling node; input protection clamps to GND–0.3V / VDD+0.3V |
| SHDN (Pin 3) | Three-Level Control Input | Pulled high → enables internal 2.5V reference; open → disables reference for external use; low → 2µA shutdown |
| REF (Pin 4) | Reference Terminal | 2.5V output (MAX1240 only); requires 4.7µF bypass cap for stability and wake-up time control |
| 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 tri-state |
| SCLK (Pin 7) | Serial Clock Input | External clock up to 2.1MHz; duty cycle unrestricted if ≥200ns per phase |
| DOUT (Pin 8) | Serial Data Output | MSB-first unipolar format; EOC signaled by rising edge; transitions on SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Single-Supply Operation | +2.7V to +3.6V - eliminates dual-rail design complexity and reduces BOM count |
| On-Chip Track/Hold | 1.5µs acquisition time - removes need for external hold capacitor and simplifies analog front-end |
| Integrated Reference | 2.5V ±0.5%, ±30ppm/°C - provides stable scaling without external precision reference IC or resistor network |
| 3-Wire Serial Interface | SPI/QSPI/MICROWIRE-compatible - directly connects to standard MCU GPIO without level-shifting or protocol translation |
| Low-Power Shutdown | 2µA typical - enables microamp-level system sleep states while retaining fast wake-up (<4µs for external ref path) |
Applications
| Battery-Powered Sensor Node | Portable Data Logger |
|---|---|
Use Scenario: Remote environmental monitoring using coin-cell or Li-ion powered microcontroller with analog sensors (temperature, humidity, pressure). IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; synchronized to MCU's low-power sleep/wake cycles via SHDN. Use Value: 2µA shutdown current extends multi-year battery life; 73ksps supports oversampling for noise reduction without external decimation logic. |
Use Scenario: Handheld device capturing vibration, acoustic, or strain gauge data during field inspections with intermittent USB charging. IC Role / Device Role / Timing Role: High-fidelity signal acquisition front-end; interfaces directly to ARM Cortex-M SPI peripheral with minimal glue logic. Use Value: Internal 2.5V reference ensures consistent measurement accuracy across varying battery voltage (2.7–3.6V), eliminating reference drift compensation firmware. |
| Isolated Industrial Data Acquisition | Process Control Transmitter |
Use Scenario: 4–20mA loop-powered transmitter with galvanic isolation, requiring precise analog input digitization before digital modulation. IC Role / Device Role / Timing Role: Isolated-side ADC converting sensor bridge outputs; driven by isolated DC-DC converter's 3.3V rail. Use Value: SO-8 package fits compact isolated PCB layouts; ±1 LSB INL meets SIL-2 functional safety margin requirements for analog input channel linearity. |
Use Scenario: Smart valve positioner or flow controller measuring potentiometer wiper voltage or differential pressure sensor output. IC Role / Device Role / Timing Role: Embedded ADC in closed-loop feedback path; sampled synchronously with PWM actuator drive to minimize jitter-induced control error. Use Value: 7.5µs conversion time enables sub-100µs control loop latency; internal reference avoids calibration drift over 15-year product lifetime. |
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 | 2.7–5.25V supply; no internal reference; 200ksps; 8-pin SOIC | Requires external 2.5V reference; higher speed but higher quiescent current (1.8mA) | Select when higher throughput is critical and external reference already exists in system |
| AD7476AARMZ | 2.35–5.25V supply; no internal reference; 1MSPS; 8-pin MSOP | Higher speed and smaller MSOP package; lacks integrated reference and shutdown control | Choose for compact, high-speed designs where reference and power management are handled externally |
Compared with ADS7822U and AD7476AARMZ, the MAX1240BESA/V+T uniquely combines internal 2.5V reference, -40°C to +85°C qualification, and 2µA shutdown in an SO-8 package - reducing component count and calibration overhead in cost-sensitive industrial sensor nodes.
Availability
MAX1240BESA/V+T is available at Aetrix Electronics and suitable for battery-powered systems, portable data loggers, and isolated data-acquisition modules requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX1240BESA/V+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 MAX1240BESA/V+T belongs to Maxim's precision low-power ADC product line, engineered for space- and energy-constrained data acquisition where integration, reliability, and temperature stability are critical.
FAQ
What is the maximum sampling rate of the MAX1240BESA/V+T?
The MAX1240BESA/V+T achieves a maximum sampling rate of 73ksps at 2.1MHz SCLK and full 12-bit resolution. This rate is sustained across its full operating temperature range (-40°C to +85°C) and supply voltage range (+2.7V to +3.6V). Conversion time is fixed at 7.5µs, and acquisition time is 1.5µs - both guaranteed under all specified conditions.
Does the MAX1240BESA/V+T require an external reference voltage?
No, the MAX1240BESA/V+T includes a factory-trimmed 2.5V internal reference with ±0.5% initial accuracy and ±30ppm/°C temperature coefficient. When SHDN is pulled high, the internal reference is enabled and drives the REF pin. An external reference is optional and only used when SHDN is left floating to disable the internal source.
What is the shutdown current specification for the MAX1240BESA/V+T?
The MAX1240BESA/V+T draws a typical shutdown current of 2µA when SHDN is pulled low, with a maximum of 15µA across temperature and voltage. This ultra-low state preserves battery life in intermittently active sensor systems and enables rapid wake-up - especially critical in duty-cycled IoT endpoints where power budget is tightly constrained.
Which microcontroller interfaces are compatible with the MAX1240BESA/V+T serial port?
The MAX1240BESA/V+T 3-wire serial interface is hardware-compatible with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols. It requires only CS, SCLK, and DOUT connections - no MISO/MOSI bidirectional lines. DOUT transitions on SCLK falling edge, and EOC is indicated by DOUT rising edge, enabling direct connection to standard MCU GPIO or dedicated serial peripherals without protocol translation.
What package type and RoHS status does the MAX1240BESA/V+T use?
The MAX1240BESA/V+T is supplied in an 8-pin SO (Small Outline) package with gull-wing leads. The "/V+" suffix confirms it is lead(Pb)-free and RoHS-compliant. Its 150mil body width and standard SOIC-8 footprint ensure compatibility with automated assembly processes and legacy PCB layouts designed for industry-standard 8-pin SO packages.
MAX1240BESA/V+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/V+T FAQ
1.How can I place an order for MAX1240BESA/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240BESA/V+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/V+T reliable?
The price and inventory of MAX1240BESA/V+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/V+T is usually 5 days.
3.What payment methods are accepted for MAX1240BESA/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240BESA/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240BESA/V+T?
MAX1240BESA/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240BESA/V+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/V+T?
For technical support, including MAX1240BESA/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240BESA/V+T requirements.
6.How does Aetrix verify that MAX1240BESA/V+T is sourced from the original manufacturer or authorized distributors?
All MAX1240BESA/V+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/V+T meets industry standards.
7.What is the process for return or replacement of MAX1240BESA/V+T?
All MAX1240BESA/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240BESA/V+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/V+T part is unused and in its original packaging.
Return procedure for MAX1240BESA/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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