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Analog Devices Inc./Maxim Integrated MAX1240BESA/V+
- Part No.:
- MAX1240BESA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240BESA/V+.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,812
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Product details
Overview
MAX1240BESA/V+ from Maxim Integrated is a -40°C to +85°C automotive-grade, 12-bit successive-approximation ADC with internal 2.5V reference, 73ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface in an 8-pin SO package. It operates from +2.7V to +3.6V and consumes only 1.6mA typical supply current at 73ksps, making it suitable for battery-powered sensor nodes and isolated data-acquisition systems.
For engineers reviewing the MAX1240BESA/V+ datasheet, MAX1240BESA/V+ pinout, MAX1240BESA/V+ application, or MAX1240BESA/V+ equivalent, key selection considerations include its guaranteed ±1 LSB INL over temperature, internal reference enable/disable via SHDN pin, 1.5µs track/hold acquisition time, and automotive qualification (AEC-Q100 stress-tested).
Technical Context
The MAX1240BESA/V+ implements a fully integrated SAR architecture with on-chip track/hold, internal 2.5V voltage reference, and unipolar serial output format. Its conversion sequence is initiated by CS falling edge, with end-of-conversion signaled by DOUT high transition - enabling microcontroller-driven timing without external interrupt lines.
It supports three-level shutdown control: SHDN low enables 2µA power-down mode; SHDN high enables internal reference; SHDN open disables internal reference for external reference use. The 3-wire interface requires no additional level-shifting and operates up to 2.1MHz SCLK with unrestricted duty cycle (≥200ns per phase).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale input range |
| Throughput Rate | 73ksps - supports 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 precision measurement |
| Supply Voltage Range | +2.7V to +3.6V - compatible with single-cell Li-ion and 3.3V logic rails |
| Reference | Internal 2.5V ±0.5% - eliminates need for external reference IC in space-constrained designs |
| Power Consumption | 1.6mA @ 73ksps (VDD = 3.6V) - enables >100-hour operation on 500mAh battery at 1ksps |
| Acquisition Time | 1.5µs - allows sampling of fast transients without external hold capacitor |
Pinout & Package
MAX1240BESA/V+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead(Pb)-free, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog and digital sections; bypass with 0.1µF + 4.7µF capacitors |
| AIN (Pin 2) | Analog input | 0V to VREF unipolar input; 16pF input capacitance; source impedance ≤1kΩ recommended for full AC performance |
| SHDN (Pin 3) | Three-level control input | Low = shutdown (≤2µA); high = enable internal reference; open = disable internal reference for external REF |
| REF (Pin 4) | Reference node | 2.5V output (internal ref enabled) or external reference input (1.0V to VDD); bypass with 4.7µF (internal) or ≥0.1µF (external) |
| GND (Pin 5) | Analog/digital ground | Single-point star ground connection required; separates analog and digital return paths to minimize noise coupling |
| SCLK (Pin 6) | Serial clock input | Asynchronous master clock up to 2.1MHz; rising/falling edge timing not critical; minimum 200ns pulse width |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode for bus sharing |
| DOUT (Pin 8) | Serial data output | Unipolar MSB-first format; leading '1' indicates EOC; transitions on SCLK falling edge; high-Z when CS = high |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 qualified (-40°C to +85°C), /V+ suffix confirms automotive reliability screening |
| Integrated track/hold | Eliminates external hold capacitor; 1.5µs acquisition time enables direct sensor interfacing |
| Configurable reference | Internal 2.5V reference enabled/disabled via SHDN pin - supports both self-contained and system-referenced designs |
| Low-power shutdown | 2µA max shutdown current - extends battery life in intermittent-sampling applications like predictive maintenance sensors |
| SPI/QSPI/MICROWIRE compatibility | No protocol translation needed - directly connects to standard MCU serial peripherals without glue logic |
| Robust analog input protection | Clamps AIN to GND–0.3V / VDD+0.3V; safe for ±50mV overvoltage during transient events |
Applications
| Portable Data Logging | Battery-Powered Systems |
|---|---|
Use Scenario: Compact environmental sensor node logging temperature, humidity, and pressure every 10 seconds using coin-cell battery. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from analog front-end; provides precise 12-bit codes synchronized to microcontroller's low-power sleep/wake cycles. Use Value: Internal 2.5V reference and 2µA shutdown current enable >5-year battery life; 8-pin SO footprint minimizes PCB area in ultra-thin enclosures. |
Use Scenario: Handheld multimeter with auto-ranging, LCD display, and Bluetooth LE connectivity. IC Role / Device Role / Timing Role: High-accuracy ADC acquiring DC voltage/current measurements; interfaces directly to 3.3V ARM Cortex-M0+ via SPI with no level shifters. Use Value: ±1 LSB INL ensures calibration stability over temperature; 73ksps supports fast continuity testing while maintaining low average power draw. |
| Isolated Data Acquisition | Process Control |
Use Scenario: DIN-rail mounted industrial I/O module measuring 4–20mA loop signals across galvanic isolation barrier. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned current-loop voltage; communicates via opto-isolated SPI to host controller. Use Value: 1.5µs acquisition time accommodates fast step-response requirements; internal reference eliminates need for isolated reference supply. |
Use Scenario: PLC analog input card acquiring thermocouple and RTD signals in factory automation cabinet. IC Role / Device Role / Timing Role: Precision ADC in multi-channel scan architecture; shares serial bus with other MAX1240BESA/V+ devices using individual CS lines. Use Value: Guaranteed ±1 LSB INL over -40°C to +85°C ensures repeatability in uncontrolled ambient environments; automotive qualification adds long-term reliability margin. |
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 | 12-bit, 200ksps, +2.7V to +5.25V supply, no internal reference, requires external REF | Higher speed but lacks internal reference and automotive qualification | Select when higher throughput is critical and external reference is already present in system |
| MAX11100ETA+ | 12-bit, 1MSPS, +2.7V to +3.6V, internal reference, SPI-only (not QSPI/MICROWIRE), 10-pin TDFN | Higher speed and smaller package, but incompatible pinout and interface timing | Select for space-constrained, high-speed applications where board redesign is acceptable |
Compared with ADS7822U and MAX11100ETA+, the MAX1240BESA/V+ uniquely combines automotive qualification, internal reference configurability via SHDN, and broad serial interface compatibility - making it optimal for cost-sensitive, reliability-critical embedded data acquisition where layout reuse and supply simplicity matter.
Availability
MAX1240BESA/V+ is available at Aetrix Electronics and suitable for portable data logging, battery-powered instrumentation, and isolated industrial sensing requiring stable component supply across automotive and industrial temperature ranges.
Supply support for MAX1240BESA/V+ 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 was designed specifically for low-power, space-constrained data acquisition systems requiring precision, small size, and simplified power/reference architecture - targeting remote sensors and portable test equipment.
FAQ
What is the operating temperature range for MAX1240BESA/V+?
The MAX1240BESA/V+ is specified for -40°C to +85°C operation and carries the /V+ suffix indicating AEC-Q100 automotive qualification. This includes extended reliability testing for thermal cycling, humidity, and mechanical shock - confirming suitability for under-hood and industrial control cabinet environments where the MAX1240BESA/V+ must maintain ±1 LSB INL performance across the full range.
How does the SHDN pin configure the internal reference on MAX1240BESA/V+?
On the MAX1240BESA/V+, the SHDN pin provides three-level control: pulling SHDN low activates 2µA shutdown mode; pulling SHDN high enables the internal 2.5V reference; leaving SHDN open disables the internal reference, allowing use of an external reference at the REF pin. This flexibility lets the same MAX1240BESA/V+ footprint support both self-contained and system-referenced designs without hardware change.
Does MAX1240BESA/V+ require an external reference capacitor?
Yes - when using the internal reference (SHDN = high), the MAX1240BESA/V+ requires a 4.7µF capacitor at the REF pin for stability and accuracy. When using an external reference (SHDN = open), a minimum 0.1µF capacitor is required. Larger values improve reference settling but increase wake-up time after shutdown; the MAX1240BESA/V+ datasheet specifies 4.7µF as optimal for automotive-grade stability.
What is the maximum SCLK frequency supported by MAX1240BESA/V+?
The MAX1240BESA/V+ supports SCLK frequencies up to 2.1MHz with 50% duty cycle, and tolerates asymmetric clocks as long as high and low pulses are each ≥200ns. This allows direct connection to standard MCU SPI peripherals without clock dividers. At 2.1MHz, the full 13-bit serial frame (1 EOC + 12 data bits) transfers in ≤6.2µs - well within the 7.5µs conversion time, enabling tight timing margins in deterministic real-time systems using MAX1240BESA/V+.
Can MAX1240BESA/V+ interface directly with a 5V microcontroller?
No - the MAX1240BESA/V+ is a +2.7V to +3.6V supply device; its digital I/O pins (SCLK, CS, DOUT, SHDN) are not 5V-tolerant. Direct connection to a 5V microcontroller risks damage. Interface requires level translation (e.g., TXB0104) or use of a 3.3V-compatible MCU. The MAX1240BESA/V+'s absolute maximum ratings specify digital inputs to GND only up to +6V, but functional operation and guaranteed timing require VDD-referenced logic levels - so 5V signaling violates the design envelope and voids specification guarantees for MAX1240BESA/V+.
MAX1240BESA/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX1240BESA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240BESA/V+ 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+ reliable?
The price and inventory of MAX1240BESA/V+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX1240BESA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240BESA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240BESA/V+?
MAX1240BESA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240BESA/V+ 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+?
For technical support, including MAX1240BESA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240BESA/V+ requirements.
6.How does Aetrix verify that MAX1240BESA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX1240BESA/V+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1240BESA/V+?
All MAX1240BESA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240BESA/V+, 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+ part is unused and in its original packaging.
Return procedure for MAX1240BESA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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