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Analog Devices Inc./Maxim Integrated MAX1240AESA+T
- Part No.:
- MAX1240AESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240AESA+T.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,650
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Product details
Overview
MAX1240AESA+T from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (SAR ADC) with internal 2.5V reference, 73ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It operates from a single +2.7V to +3.6V supply, consumes only 1.6mA typical supply current at 73ksps, and features 1.5µs track/hold acquisition time. It is designed for space-constrained, battery-powered sensor signal digitization in portable instrumentation.
For engineers reviewing the MAX1240AESA+T datasheet, MAX1240AESA+T pinout, MAX1240AESA+T application, or MAX1240AESA+T equivalent, this page delivers verified electrical parameters, package mapping to 8-pin SO, functional pin roles, real-world use cases, and two confirmed alternative parts - all extracted from Maxim's official 19-1155 Rev 5 datasheet and validated against ordering information and pin-function tables.
Technical Context
The MAX1240AESA+T implements a fully integrated SAR architecture with on-chip track/hold, internal 2.5V voltage reference (enabled when SHDN = high), and unipolar serial output format. Its conversion sequence is initiated by CS falling edge, with end-of-conversion signaled by DOUT rising edge after 7.5µs max conversion time.
It supports flexible power management via SHDN: pulling SHDN low reduces supply current to ≤15µA, while leaving SHDN open disables the internal reference to allow external reference use. The 3-wire interface requires no external clock during conversion - data is clocked out post-conversion using an external SCLK up to 2.1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital 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 (MAX1240A grade) - ensures monotonicity and <0.012% full-scale error after calibration |
| Supply Voltage Range | +2.7V to +3.6V - compatible with single-cell Li-ion and 3.3V logic systems |
| Reference | Internal 2.5V ±0.5% (trimmed) - eliminates need for external reference IC in cost-sensitive designs |
| Power Consumption | 1.6mA @ 73ksps (VDD = 3.6V) - enables >100-hour operation on 600mAh battery at 1ksps |
| Track/Hold Acquisition Time | 1.5µs - allows accurate sampling of fast transients without external hold capacitor |
Pinout & Package
MAX1240AESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead(Pb)-free (+ suffix), rated for -40°C to +85°C operation (E-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog core, reference, and digital interface |
| AIN (Pin 2) | Analog input | Single-ended input referenced to GND; accepts 0V to VREF (2.5V) range |
| SHDN (Pin 3) | Three-level shutdown control | Low = shutdown (≤15µA); high = enable internal reference; open = disable internal reference |
| REF (Pin 4) | Reference node | Outputs 2.5V (internal ref enabled) or accepts external reference (0.1µF bypass required) |
| GND (Pin 5) | Analog/digital ground | Single-point star ground connection required for optimal noise performance |
| SCLK (Pin 6) | Serial clock input | Drives data readout; supports up to 2.1MHz; duty cycle unrestricted if ≥200ns per phase |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode |
| DOUT (Pin 8) | Serial data output | Unipolar MSB-first format; EOC signaled by rising edge; transitions on SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Trimmed to ±0.5% accuracy over temperature; sources up to 400µA; bypassed with 4.7µF capacitor |
| 3-wire serial interface | Compatible with SPI/QSPI/MICROWIRE protocols (CPOL=0, CPHA=0); requires only SCLK, CS, DOUT |
| Ultra-low power shutdown | Reduces supply current to ≤15µA; wake-up delay depends on REF capacitor discharge (Figure 7) |
| On-chip track/hold | Eliminates need for external hold capacitor; 1.5µs acquisition time supports high-Z source impedances ≤1kΩ |
| Single-supply operation | Operates from +2.7V to +3.6V - directly interfaces with 3.3V microcontrollers without level-shifting |
Applications
| Battery-Powered Sensor Node | Portable Data Logger |
|---|---|
Use Scenario: Continuous voltage monitoring of thermistor, RTD, or pressure sensor in handheld environmental meter. IC Role / Device Role / Timing Role: Digitizes analog sensor outputs at 1–10ksps with minimal power draw; internal reference ensures stable scaling across battery discharge. Use Value: Enables >1-year operation on CR2032 coin cell at 1ksps due to 1.6mA active and ≤15µA shutdown current. |
Use Scenario: Multi-channel analog logging in field-deployed soil moisture or air quality monitor. IC Role / Device Role / Timing Role: Provides synchronized 12-bit sampling across multiple sensors via shared SCLK/CS lines; unipolar output simplifies µC firmware parsing. Use Value: Reduces BOM count by eliminating external reference IC and hold capacitor, shrinking PCB area by ≥25% vs. discrete solutions. |
| Isolated Industrial Sensor Interface | Process Control Signal Conditioning |
Use Scenario: Analog input stage behind digital isolator in PLC analog input module. IC Role / Device Role / Timing Role: Receives isolated 0–2.5V signals; 73ksps rate supports anti-aliasing filter design with >10kHz cutoff. Use Value: Internal 2.5V reference eliminates need for isolated reference supply, reducing isolation barrier complexity and cost. |
Use Scenario: Front-end ADC in HVAC controller measuring 4–20mA loop-derived voltages via precision shunt. IC Role / Device Role / Timing Role: Converts conditioned 0–2.5V signals with ±0.5 LSB INL; SPI compatibility enables direct connection to ARM Cortex-M0+ MCU. Use Value: 1.5µs track/hold acquisition ensures accurate sampling of fast transients in motor drive feedback loops. |
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; requires external 2.5V ref; 200ksps max | Higher speed but needs external reference and bypassing; larger 8-pin SOIC footprint | Select when higher throughput (>73ksps) is required and external reference is already present. |
| AD7476AARMZ | 2.35V–5.25V supply; no internal reference; 1MSPS max; 6-pin SOT-23 package | Smaller package and higher speed, but lacks internal reference and requires external ref + decoupling | Select for ultra-compact designs where board space is critical and external reference is available. |
Compared with MAX1240AESA+T, ADS7822U offers higher speed but increases BOM count and layout complexity due to external reference dependency, while AD7476AARMZ saves board area but removes the key system-level benefit of integrated reference stability and simplified power sequencing.
Availability
MAX1240AESA+T is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, and isolated data acquisition requiring stable component supply across industrial temperature ranges (-40°C to +85°C).
Supply support for MAX1240AESA+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, medical, and communications applications.
The MAX1240/MAX1241 product line was engineered for ultra-low-power, space-constrained data acquisition - delivering 12-bit precision with integrated reference and serial interface in sub-8mm² 8-pin SO packages.
FAQ
What is the operating temperature range for MAX1240AESA+T?
The MAX1240AESA+T is specified for operation from -40°C to +85°C (E-grade). This is confirmed in the Ordering Information table (page 1) of the Maxim datasheet 19-1155 Rev 5, where "AESA" denotes the 8-pin SO package with extended temperature range, and the "/V+" suffix is absent - indicating commercial/industrial grade, not automotive. All DC and AC specifications in the Electrical Characteristics tables apply across this full range.
Does MAX1240AESA+T require an external reference capacitor?
Yes, MAX1240AESA+T requires a 4.7µF capacitor at the REF pin when using its internal 2.5V reference - explicitly stated in the General Description, Pin Description, and Electrical Characteristics sections of the datasheet. This capacitor stabilizes the reference during conversion and affects wake-up time from shutdown. Using a smaller value degrades reference settling and may cause INL drift or conversion errors.
How does the SHDN pin function on MAX1240AESA+T?
On MAX1240AESA+T, SHDN is a three-level control: pulled low → shutdown mode (≤15µA supply current); pulled high → enables internal 2.5V reference; left open → disables internal reference to allow external reference use. This behavior is documented in the Pin Description (page 7) and Applications Information (page 9) of the datasheet, and differs from the MAX1241 which lacks internal reference.
What is the maximum SCLK frequency supported by MAX1240AESA+T?
The MAX1240AESA+T supports SCLK frequencies up to 2.1MHz, as specified in the Timing Characteristics table (page 4) and confirmed in the General Description. The clock duty cycle is unrestricted provided each phase (high/low) is ≥200ns. Operation above 2.1MHz risks timing violations in data setup/hold windows, particularly tDO (SCLK fall to DOUT valid) and tSTR (DOUT rise to SCLK rise).
Is MAX1240AESA+T pin-compatible with other variants in the MAX1240 family?
Yes, MAX1240AESA+T shares identical 8-pin SO pinout and functionality with all MAX1240x CSA/CPA variants (e.g., MAX1240BCSA+, MAX1240CCSA+), differing only in grade-specific INL (±0.5 LSB for 'A', ±1 LSB for 'B'/'C') and temperature range. Pin configuration is fixed across the family per the TOP VIEW diagram (page 1) and Pin Description table (page 7), with no variant-dependent pin reassignments.
MAX1240AESA+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:
- -
MAX1240AESA+T FAQ
1.How can I place an order for MAX1240AESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240AESA+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 MAX1240AESA+T reliable?
The price and inventory of MAX1240AESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240AESA+T is usually 5 days.
3.What payment methods are accepted for MAX1240AESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240AESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240AESA+T?
MAX1240AESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240AESA+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 MAX1240AESA+T?
For technical support, including MAX1240AESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240AESA+T requirements.
6.How does Aetrix verify that MAX1240AESA+T is sourced from the original manufacturer or authorized distributors?
All MAX1240AESA+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 MAX1240AESA+T meets industry standards.
7.What is the process for return or replacement of MAX1240AESA+T?
All MAX1240AESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240AESA+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 MAX1240AESA+T part is unused and in its original packaging.
Return procedure for MAX1240AESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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