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Analog Devices Inc./Maxim Integrated MAX1240BESA
- Part No.:
- MAX1240BESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240BESA.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
MAX1240BESA from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (SAR ADC) with internal 2.5V reference, 73ksps throughput, 1.5µs track/hold acquisition time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for precision data acquisition in space-constrained, battery-powered sensor nodes.
For engineers reviewing the MAX1240BESA datasheet, MAX1240BESA pinout, MAX1240BESA application, or MAX1240BESA equivalent, this page delivers verified electrical specs, thermal operating range (-40°C to +85°C), SO-8 package mapping, real-world use-value tradeoffs vs. alternatives, and supply-chain support for industrial embedded and remote sensing designs.
Technical Context
The MAX1240BESA implements a fully integrated SAR architecture with on-chip track/hold, internal clock, and unipolar 12-bit conversion over 0V to VREF input range. Its internal 2.5V reference is trimmed to ±0.5 LSB INL and exhibits ±30 ppm/°C temperature coefficient.
It operates from a single +2.7V to +3.6V supply, draws 1.6mA typical active current at 73ksps, and enters 2µA shutdown mode when SHDN is pulled low - enabling ultra-low average power in duty-cycled measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = 610 µV step size with 2.5V reference for sub-millivolt measurement fidelity. |
| Throughput Rate | 73 ksps - supports real-time sampling of signals up to ~36.5 kHz Nyquist bandwidth without aliasing. |
| INL (Integral Nonlinearity) | ±1 LSB - ensures monotonicity and <0.024% full-scale error across temperature for calibrated systems. |
| Supply Range | +2.7V to +3.6V - compatible with Li-ion, 3.3V rail, and low-voltage microcontroller I/O domains. |
| Reference | Internal 2.5V ±0.5% (25°C), ±30 ppm/°C drift - eliminates external reference component count and layout complexity. |
| Power Consumption | 37 mW at 73ksps (VDD = 3V); 2 µA shutdown - enables multi-year battery life in wake-sleep telemetry applications. |
| SINAD / SNR | 70 dB (10 kHz input) - supports >11.3 effective bits for high-fidelity sensor signal digitization. |
Pinout & Package
MAX1240BESA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+ suffix), with standard 1.27 mm pitch and JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | Accepts +2.7V to +3.6V; requires 0.1µF + 4.7µF bypass to GND for stable reference and low-noise operation. |
| 2 AIN | Analog input | Single-ended 0V to VREF input node; 16 pF input capacitance; supports source impedances ≤1 kΩ for full AC performance. |
| 3 SHDN | Three-level shutdown control | Pull low → 2 µA shutdown; leave open → internal reference disabled; pull high → internal reference enabled (MAX1240 only). |
| 4 REF | Reference voltage terminal | 2.5V output (internal ref enabled); bypass with 4.7µF capacitor; supports external reference if SHDN open. |
| 5 GND | Analog/digital common ground | Single-point star ground connection required; separates analog and digital return paths to minimize noise coupling. |
| 6 DOUT | Serial data output | 3-wire SPI-compatible output; MSB-first unipolar format; high-impedance when CS = high; transitions on SCLK falling edge. |
| 7 CS | Active-low chip select | Falling edge initiates conversion; must remain low until all 13 bits (EOC + 12 data) are clocked out. |
| 8 SCLK | Serial clock input | Accepts up to 2.1 MHz clock; duty cycle unrestricted if each phase ≥200 ns; no clock needed during conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Trimmed to ±0.5% initial accuracy and ±30 ppm/°C drift - removes need for external reference IC and associated PCB area. |
| Low-power shutdown mode | 2 µA max supply current - enables energy-proportional sampling in battery-operated IoT endpoints with 1–10 s measurement intervals. |
| Integrated track/hold | 1.5 µs acquisition time with no external hold capacitor - simplifies front-end design and improves channel settling consistency. |
| 3-wire serial interface | Hardware-compatible with SPI, QSPI, and MICROWIRE protocols (CPOL=0, CPHA=0) - interoperable with most microcontrollers without glue logic. |
| Single-supply operation | +2.7V to +3.6V range - matches modern low-voltage MCU rails and eliminates dual-supply sequencing complexity. |
Applications
| Battery-Powered Sensor Node | Portable Data Logger |
|---|---|
Use Scenario: Continuous temperature/humidity monitoring in wireless environmental sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from thermistors and capacitive humidity sensors at 1–10 Hz rate. Use Value: 2 µA shutdown current extends battery life beyond 5 years; internal reference eliminates calibration drift between sensor and ADC. |
Use Scenario: Handheld field instrument capturing vibration, pressure, or strain data during equipment maintenance checks. IC Role / Device Role / Timing Role: High-fidelity front-end ADC synchronizing with microcontroller-triggered burst sampling at 73 ksps. Use Value: 70 dB SINAD and ±1 LSB INL ensure accurate FFT-based spectral analysis; SO-8 package fits compact handheld PCB layouts. |
| Isolated Industrial Transmitter | Process Control Loop Monitor |
Use Scenario: 4–20 mA loop-powered transmitter with galvanic isolation, converting local sensor signals before current-loop modulation. IC Role / Device Role / Timing Role: Isolated-side ADC feeding isolated SPI interface to microcontroller across transformer or capacitive barrier. Use Value: 3-wire interface minimizes isolated side pin count; 1.5 µs track/hold enables fast settling after isolation stage output transients. |
Use Scenario: PLC analog input module measuring tank level, flow rate, or valve position in factory automation systems. IC Role / Device Role / Timing Role: Channel ADC in multiplexed 8-channel input card, performing sequential conversions under RTOS scheduling. Use Value: ±1 LSB INL and 73 ksps throughput allow simultaneous high-accuracy and high-channel-count scanning without interpolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply; no internal reference; 1 MSPS; 8-pin SOIC but requires external 2.5V ref and decoupling. | Higher speed but higher power (1.2 mA active); suited for non-battery applications needing faster sampling. | Select when system already provides precision 2.5V reference and throughput >73 ksps is required. |
| AD7476ARMZ | 2.35V–5.25V supply; no internal reference; 1 MSPS; 8-pin MSOP; ±0.5 LSB INL; 1.2 µA shutdown. | Smaller MSOP package; lower shutdown current; but lacks integrated reference and requires external ref design. | Select for ultra-small form factor and lowest shutdown current where external reference is acceptable. |
Compared with MAX1240BESA, ADS7822U offers higher speed but demands external reference design effort and consumes more power; AD7476ARMZ reduces footprint and shutdown current but forfeits the integrated 2.5V reference that simplifies calibration and lowers BOM cost in sensor-node applications.
Availability
MAX1240BESA is available at Aetrix Electronics and suitable for battery-powered sensor nodes, portable data loggers, isolated industrial transmitters, and process control loop monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1240BESA 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 for low-power, high-accuracy 12-bit conversion in resource-constrained embedded systems where size, power, and reference integration are critical.
FAQ
What is the operating temperature range of the MAX1240BESA?
The MAX1240BESA is rated for -40°C to +85°C ambient operation, validated across its full DC and AC specifications including INL, gain error, and reference stability. This extended industrial temperature range makes MAX1240BESA suitable for deployment in outdoor sensor enclosures, factory-floor instrumentation, and automotive cabin modules where thermal cycling is expected.
Does the MAX1240BESA require an external reference voltage?
No - the MAX1240BESA includes a factory-trimmed 2.5V internal reference with ±0.5% initial accuracy and ±30 ppm/°C temperature coefficient. When SHDN is pulled high, the internal reference is enabled and drives the REF pin; leaving SHDN open disables it, allowing optional external reference use. The internal reference eliminates BOM cost and layout complexity in most sensor applications.
How does the MAX1240BESA interface with a microcontroller SPI port?
The MAX1240BESA uses a 3-wire SPI-compatible interface (CS, SCLK, DOUT) with CPOL = 0 and CPHA = 0. A CS falling edge initiates conversion; DOUT goes high to signal end-of-conversion (EOC); then 13 clock edges (1 EOC bit + 12 data bits, MSB first) shift out the result. No MISO/MOSI bidirectional lines are needed - only three GPIOs or dedicated SPI pins are required.
What is the minimum acquisition time for the MAX1240BESA's track/hold circuit?
The MAX1240BESA specifies a maximum track/hold acquisition time (tACQ) of 1.5 µs - also the minimum time required for full signal settling. This value assumes source impedance ≤1 kΩ. For higher source impedances, tACQ increases per tACQ = 9(RS + 9kΩ) × 16pF, requiring additional inter-conversion delay to maintain accuracy.
Can the MAX1240BESA operate from a 3.3V supply?
Yes - the MAX1240BESA is explicitly specified for +2.7V to +3.6V single-supply operation, making 3.3V its ideal nominal rail. At VDD = 3.3V, it delivers 73 ksps throughput, 1.6 mA typical supply current, and maintains ±1 LSB INL and 70 dB SINAD across -40°C to +85°C, fully compatible with standard 3.3V microcontrollers and LDO regulators.
MAX1240BESA 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:
- Obsolete
- 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 FAQ
1.How can I place an order for MAX1240BESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240BESA 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 reliable?
The price and inventory of MAX1240BESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240BESA is usually 5 days.
3.What payment methods are accepted for MAX1240BESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240BESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240BESA?
MAX1240BESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240BESA 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?
For technical support, including MAX1240BESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240BESA requirements.
6.How does Aetrix verify that MAX1240BESA is sourced from the original manufacturer or authorized distributors?
All MAX1240BESA 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 meets industry standards.
7.What is the process for return or replacement of MAX1240BESA?
All MAX1240BESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240BESA, 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 part is unused and in its original packaging.
Return procedure for MAX1240BESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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