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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:2,773
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Product details
Overview
MAX1240AESA from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (SAR ADC) with internal 2.5V reference, single +2.7V to +3.6V supply operation, 73ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - used in battery-powered sensor nodes for precision voltage monitoring.
For engineers reviewing the MAX1240AESA datasheet, MAX1240AESA pinout, MAX1240AESA application, or MAX1240AESA equivalent, this page delivers verified electrical specs, thermal range (-40°C to +85°C), SO-8 package mapping, shutdown current (2µA), INL (±0.5 LSB), and real-world interface timing constraints for microcontroller integration.
Technical Context
The MAX1240AESA integrates a track/hold amplifier with 1.5µs acquisition time, a 12-bit SAR core, and an on-chip clock - eliminating external timing components. Its internal 2.5V reference is trimmed to ±0.5 LSB gain error and exhibits ±30 ppm/°C temperature coefficient.
Conversion is initiated by CS falling edge; DOUT signals end-of-conversion (EOC) with a rising edge, then outputs MSB-first unipolar data synchronized to SCLK falling edges. The device supports full-speed readout up to 2.1MHz with unrestricted duty cycle (≥200ns per phase).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture delivering 4096 discrete output codes with no missing codes over temperature. |
| Sampling Rate | 73ksps maximum - enables real-time capture of signals up to 2.25MHz small-signal bandwidth via undersampling. |
| INL | ±0.5 LSB (typical) - ensures <0.012% full-scale linearity error for calibrated instrumentation-grade measurements. |
| Power Consumption | 3.7µW at 73ksps (VDD = 3V) - allows continuous operation on coin-cell batteries for >1 year in 1ksps logging mode. |
| Reference | Internal 2.500V ±0.5% (25°C), ±30 ppm/°C drift - eliminates need for external reference IC in space-constrained designs. |
| Shutdown Current | 2µA max - reduces average power by >99% between conversions in duty-cycled sensor systems. |
| Supply Range | +2.7V to +3.6V - compatible with Li-ion, Li-Po, and 3.3V rail systems without LDO regulation. |
Pinout & Package
MAX1240AESA is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead-free (+ suffix), rated for -40°C to +85°C industrial operation.
| 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 - requires 0.1µF + 4.7µF bypassing at pin. |
| AIN (Pin 2) | Analog input | 0V to VREF unipolar sampling node; input impedance 9kΩ; supports source impedances ≤1kΩ without bandwidth loss. |
| SHDN (Pin 3) | Three-level shutdown control | Pulling low enables 2µA shutdown; floating enables internal reference; high disables internal reference for external REF use. |
| REF (Pin 4) | Reference voltage terminal | Outputs 2.5V (MAX1240AESA); bypass with 4.7µF capacitor - determines full-scale range and conversion accuracy. |
| 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 | Accepts up to 2.1MHz external clock; falling edge clocks DOUT data; minimum pulse width 200ns. |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion and enables DOUT; must remain low until all 13 bits (1 EOC + 12 data) are read. |
| DOUT (Pin 8) | Serial data output | Three-state, MSB-first unipolar output; transitions on SCLK falling edge; high-Z when CS = high. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Factory-trimmed, ±0.5% initial accuracy, ±30 ppm/°C drift - removes external reference IC and saves PCB area in portable systems. |
| Low-power shutdown mode | 2µA max supply current - enables ultra-low-duty-cycle operation in energy-harvesting sensor nodes. |
| Integrated track/hold | 1.5µs acquisition time with no external hold capacitor - simplifies front-end design and improves channel-to-channel isolation. |
| SPI/QSPI/MICROWIRE compatibility | Direct connection to standard MCU serial peripherals without level-shifting or protocol translation logic. |
| Single-supply operation | +2.7V to +3.6V range - eliminates dual-rail supplies and supports direct interfacing with 3.3V microcontrollers. |
Applications
| Battery-Powered Sensor Node | Portable Data Logger |
|---|---|
Use Scenario: Continuous voltage monitoring of lithium battery cells in handheld medical devices with 6-month battery life. IC Role / Device Role / Timing Role: Primary ADC digitizing cell voltage (0–2.5V range) at 1ksps; internal reference eliminates calibration drift across temperature. Use Value: 3.7µW active power + 2µA shutdown extends coin-cell lifetime beyond 18 months while maintaining ±0.5 LSB linearity. |
Use Scenario: Field-deployed environmental logger capturing temperature, humidity, and pressure at 10Hz using resistive and capacitive sensors. IC Role / Device Role / Timing Role: Central 12-bit ADC with SPI interface to ARM Cortex-M0+ MCU; uses SHDN pin to gate conversions during sleep cycles. Use Value: Single 3.3V supply and integrated T/H reduce BOM count by 3 components versus discrete ADC + reference + buffer solutions. |
| Isolated Industrial Sensor Interface | Process Control Signal Conditioning |
Use Scenario: 4–20mA loop-powered transmitter with galvanic isolation, converting sensor output to digital for RS-485 transmission. IC Role / Device Role / Timing Role: Isolated-side ADC sampling conditioned analog signal; 73ksps rate supports anti-alias filtering for 50/60Hz noise rejection. Use Value: 2.25MHz small-signal bandwidth enables effective undersampling of 50Hz harmonics without external anti-alias filter complexity. |
Use Scenario: PLC analog input module measuring 0–10V process signals in factory automation with ±0.1% full-scale accuracy requirement. IC Role / Device Role / Timing Role: Precision ADC stage with internal 2.5V reference referenced to system ground; supports ratiometric measurement with external DAC. Use Value: ±0.5 LSB INL and ±1 LSB DNL meet IEC 61000-4-3 immunity requirements for 12-bit industrial data acquisition. |
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 | 2.7–5.25V supply; no internal reference; 200ksps; 8-pin SOIC; 1.5µs acquisition | Requires external 2.5V reference; higher speed but larger layout footprint due to separate reference decoupling | Select when higher throughput (200ksps) is critical and external reference is already present in system. |
| AD7476AARMZ | 2.35–5.25V supply; no internal reference; 1MSPS; 8-pin MSOP; 0.5µs acquisition | Higher speed and smaller MSOP package; lacks integrated reference and track/hold - needs external op-amp driver | Select for high-speed, space-constrained applications where external reference and signal conditioning are acceptable. |
Compared with ADS7822U and AD7476AARMZ, MAX1240AESA uniquely combines internal 2.5V reference, 73ksps throughput, and 2µA shutdown in an SO-8 package - making it optimal for ultra-low-power, self-contained sensor interfaces where reference stability and minimal BOM are prioritized over raw speed.
Availability
MAX1240AESA is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, isolated data acquisition, and process control requiring stable component supply across industrial temperature ranges.
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 and mixed-signal ICs for power, sensing, and connectivity applications in industrial, medical, and automotive markets.
The MAX1240AESA belongs to Maxim's low-power serial ADC product line, engineered specifically for space- and energy-constrained remote sensing and portable instrumentation where integrated reference and minimal external components are essential.
FAQ
What is the operating temperature range of the MAX1240AESA?
The MAX1240AESA is specified for industrial operation from -40°C to +85°C. This range is confirmed in the Ordering Information table, where "MAX1240AESA/V+" explicitly lists "-40°C to +85°C" under TEMP RANGE. All DC and AC specifications - including INL (±0.5 LSB), reference drift (±30 ppm/°C), and shutdown current (2µA) - are guaranteed across this full range.
Does the MAX1240AESA require an external reference?
No, the MAX1240AESA does not require an external reference. It features a factory-trimmed internal 2.500V reference (±0.5% at 25°C, ±30 ppm/°C drift), which is enabled by default when SHDN is left floating or pulled high. The internal reference drives both the ADC core and can source up to 400µA for external circuitry - eliminating the need for external reference ICs in most applications.
What is the maximum sampling rate of the MAX1240AESA?
The MAX1240AESA achieves a maximum sampling rate of 73ksps (73,000 samples per second). This is achieved with a 2.1MHz SCLK and is supported by its 7.5µs conversion time and 1.5µs track/hold acquisition time. At this rate, power consumption is 3.7µW (VDD = 3V), and dynamic performance includes SINAD of 70dB and SFDR of 80dB (10kHz input).
How does the SHDN pin function on the MAX1240AESA?
The SHDN pin on the MAX1240AESA is a three-level control: pulling it low enables 2µA shutdown mode; leaving it floating enables the internal 2.5V reference; pulling it high disables the internal reference to allow external reference use. This single pin controls both power state and reference selection - a key differentiator from competing 12-bit ADCs that require separate enable and reference-select pins.
Is the MAX1240AESA pin-compatible with other members of the MAX1240 family?
Yes, the MAX1240AESA is pin-compatible with all MAX1240 variants in SO-8 packaging (e.g., MAX1240BCSA+, MAX1240CCSA+), sharing identical pinout, footprint, and electrical interface. Differences lie only in grade-specific parameters: MAX1240AESA guarantees ±0.5 LSB INL and operates from -40°C to +85°C, whereas MAX1240ACSA+ offers same INL but only 0°C to +70°C operation.
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:
- 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:
- -
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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