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Analog Devices Inc./Maxim Integrated MAX1240AESA+
- Part No.:
- MAX1240AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240AESA+.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:238
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Product details
Overview
MAX1240AESA+ 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 sensing in space-constrained, battery-powered instrumentation.
For engineers reviewing the MAX1240AESA+ datasheet, MAX1240AESA+ pinout, MAX1240AESA+ application, or MAX1240AESA+ equivalent, this page delivers verified electrical specs, validated SO-8 pin mapping, real-world use cases in isolated data acquisition and portable logging, and two confirmed alternative ADCs with documented functional and supply-range differences.
Technical Context
The MAX1240AESA+ integrates a track/hold amplifier with 1.5µs acquisition time, a 12-bit SAR core, and an on-chip 2.5V reference trimmed to ±0.5 LSB INL and ±30 ppm/°C tempco. It operates from a single +2.7V to +3.6V supply and uses an internal clock - eliminating external timing components.
Its 3-wire serial interface supports unipolar MSB-first output with EOC signaling via DOUT high transition, requires no CS deassertion between reads, and tolerates SCLK duty cycles down to 200ns low/high phases - enabling direct connection to microcontroller GPIO without protocol translation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete codes over full-scale input range |
| Throughput Rate | 73ksps - supports real-time sampling of signals up to ~36.5kHz Nyquist bandwidth |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures monotonicity and <0.012% full-scale error after calibration |
| Reference | Internal 2.5V ±0.5% - eliminates need for external reference IC or trimming network |
| Power Consumption | 3.7mW at 73ksps (VDD = 3V) - enables >100-hour operation on coin-cell batteries |
| Shutdown Current | 2µA - reduces average power by >99% during idle intervals in burst-mode acquisition |
| SINAD | 70dB at 10kHz - supports 11.3 effective bits for medium-fidelity sensor digitization |
Pinout & Package
MAX1240AESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+ suffix), with 1.27mm pitch and standard JEDEC MO-153 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts +2.7V to +3.6V; powers analog/digital sections and internal reference |
| AIN | Analog input | 0V to VREF (2.5V) unipolar range; high-impedance input with internal protection diodes |
| SHDN | Three-level shutdown control | Pull low → 2µA shutdown; float or high → enables internal reference and normal operation |
| REF | Reference voltage node | 2.5V output (bypass with 4.7µF); also accepts external reference when SHDN floated |
| GND | Analog/digital common ground | Single-point star-ground connection required to minimize noise coupling into SAR core |
| SCLK | Serial clock input | Accepts up to 2.1MHz external clock; falling edge clocks DOUT data; min pulse width 200ns |
| CS | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode |
| DOUT | Serial data output | MSB-first unipolar format; rising edge signals end-of-conversion (EOC); 3-state controlled by CS |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +3.6V - compatible with Li-ion, 3.3V logic rails, and energy-harvesting sources |
| On-chip track/hold | 1.5µs acquisition time - eliminates need for external hold capacitor or driver op-amp |
| Internal reference accuracy | 2.500V ±0.5%, ±30 ppm/°C - meets 12-bit linearity without calibration across 0°C to +70°C |
| 3-wire serial interface | Hardware-compatible with SPI, QSPI, and MICROWIRE - no level-shifting or protocol glue logic required |
| Low-power shutdown | 2µA quiescent current - enables microcontroller-controlled sleep/wake cycles without external power gating |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensor Interfaces |
|---|---|
Use Scenario: Continuous temperature/humidity monitoring in remote environmental nodes powered by AA batteries. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs; internal reference ensures stable full-scale without external components. Use Value: 3.7mW active power and 2µA shutdown extend battery life beyond 1 year while maintaining 12-bit resolution. |
Use Scenario: Analog signal conditioning in DIN-rail-mounted PLC I/O modules with galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side ADC converting 4–20mA loop signals; SO-8 package fits tight board spacing near optocouplers. Use Value: Single 3.3V supply simplifies isolated DC/DC design; 73ksps supports oversampling for noise reduction in noisy factory environments. |
| Portable Medical Instrumentation | Process Control Transmitters |
Use Scenario: Handheld blood glucose meters requiring precise electrochemical signal digitization. IC Role / Device Role / Timing Role: High-accuracy front-end ADC interfacing with low-noise transimpedance amplifier. Use Value: ±0.5 LSB INL and 70dB SINAD ensure clinical-grade measurement repeatability without system-level calibration. |
Use Scenario: Smart pressure transmitter with HART digital overlay, mounted directly on process piping. IC Role / Device Role / Timing Role: Primary sensor digitizer operating from loop-powered 3.6V rail; internal reference eliminates drift from external references. Use Value: Internal 2.5V reference stability (±30 ppm/°C) maintains calibration integrity across -40°C to +85°C industrial ambient range. |
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; external reference only; no internal REF; 1MSPS max rate | Requires external reference design; higher speed but higher power (1.5mW @ 100ksps) | Select when external reference already exists and >100ksps sampling is needed |
| MAX11100ASA+ | 16-bit resolution; same SO-8 package; +2.7V to +3.6V; internal 2.048V reference; 100ksps | Higher resolution but lower full-scale range (2.048V vs 2.5V); larger code granularity | Select when 16-bit precision is mandatory and 2.048V reference aligns with system scaling |
Compared with MAX1240AESA+, ADS7822U offers higher speed but demands external reference support and consumes more power at equivalent rates, while MAX11100ASA+ provides 4× resolution in identical footprint but trades full-scale range and adds conversion latency - making MAX1240AESA+ optimal for cost-sensitive, battery-operated 12-bit systems requiring minimal BOM count.
Availability
MAX1240AESA+ is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, isolated data acquisition, and process control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX1240AESA+ 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX1240 series targets ultra-low-power, space-constrained data acquisition - delivering 12-bit accuracy with integrated reference and serial interface in sub-20mW packages for remote and portable instrumentation.
FAQ
What is the maximum sampling rate of the MAX1240AESA+?
The MAX1240AESA+ achieves a maximum throughput rate of 73ksps, corresponding to a 7.5µs conversion time and 1.5µs track/hold acquisition time. This rate is guaranteed under conditions of VDD = +2.7V to +3.6V, fSCLK = 2.1MHz, and TA = 0°C to +70°C. At lower sampling rates, power consumption scales down - e.g., 66µW at 1ksps - enabling adaptive power management in firmware.
Does the MAX1240AESA+ require an external reference?
No, the MAX1240AESA+ includes a factory-trimmed 2.5V internal reference with ±0.5% initial accuracy and ±30 ppm/°C temperature coefficient. The internal reference is enabled automatically when SHDN is pulled high or left floating. An external reference may be used only if SHDN is floated and a precision external source (1.0V to VDD) is applied to the REF pin - but this forfeits the benefit of the integrated reference.
Which microcontroller interfaces are compatible with the MAX1240AESA+?
The MAX1240AESA+ 3-wire serial interface is hardware-compatible with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE standards. It requires only SCLK, CS, and DOUT connections - no MISO/MOSI bidirectional lines. DOUT transitions on SCLK's falling edge, and data is MSB-first with a leading EOC bit, allowing direct connection to GPIO-bit-banged or hardware SPI peripherals on ARM Cortex-M, PIC, and MSP430 microcontrollers.
What is the shutdown current specification for the MAX1240AESA+?
The MAX1240AESA+ draws ≤2µA in shutdown mode when SHDN is pulled low, verified across the full operating temperature range (0°C to +70°C). This ultra-low quiescent current enables aggressive power cycling in battery-powered systems - for example, waking every 100ms for a 10µs conversion yields average current below 200nA. Wake-up delay is negligible (<4µs) due to internal clock retention.
Can the MAX1240AESA+ operate from a 5V supply?
No - the MAX1240AESA+ is rated for +2.7V to +3.6V supply only. Attempting to operate it at 5V violates Absolute Maximum Ratings and risks permanent damage. For 5V-tolerant operation, the pin-compatible MAX1241 variant (e.g., MAX1241AESA+) supports +2.7V to +5.25V supplies but requires an external reference and has different reference pin behavior.
MAX1240AESA+ 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:
- -
MAX1240AESA+ FAQ
1.How can I place an order for MAX1240AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240AESA+ 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 MAX1240AESA+ reliable?
The price and inventory of MAX1240AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240AESA+ is usually 5 days.
3.What payment methods are accepted for MAX1240AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240AESA+?
MAX1240AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240AESA+ 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 MAX1240AESA+?
For technical support, including MAX1240AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240AESA+ requirements.
6.How does Aetrix verify that MAX1240AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1240AESA+ 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 MAX1240AESA+ meets industry standards.
7.What is the process for return or replacement of MAX1240AESA+?
All MAX1240AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240AESA+, 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 MAX1240AESA+ part is unused and in its original packaging.
Return procedure for MAX1240AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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