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Analog Devices Inc./Maxim Integrated MAX1240ACSA+T
- Part No.:
- MAX1240ACSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240ACSA+T.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,434
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Product details
Overview
MAX1240ACSA+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 3.7µW at full speed (VDD = 3V), and features 1.5µs track/hold acquisition time - ideal for battery-powered sensor nodes and portable data loggers.
For engineers reviewing the MAX1240ACSA+T datasheet, MAX1240ACSA+T pinout, MAX1240ACSA+T application, or MAX1240ACSA+T equivalent, this page delivers verified electrical specs, validated pin functions, confirmed operating conditions (0°C to +70°C), real-world use cases in isolated acquisition and instrumentation, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The MAX1240ACSA+T implements a fully integrated SAR architecture with on-chip track/hold, internal clock, and unipolar serial output. Its conversion cycle completes in 7.5µs, including 1.5µs acquisition, and uses a 12-bit capacitive DAC referenced to its trimmed 2.5V internal voltage source.
It supports three-level shutdown control: SHDN = low enables 2µA power-down mode; SHDN = high activates the internal reference; SHDN = open disables internal reference for external reference use. The 3-wire interface (SCLK, CS, DOUT) requires no external components and interfaces directly with standard microcontroller GPIOs without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale input range |
| Sampling Rate | 73ksps - supports real-time monitoring of signals up to ~36.5kHz Nyquist bandwidth |
| INL (Integral Nonlinearity) | ±0.5 LSB - 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 rails |
| Power Consumption | 3.7µW at 73ksps (VDD = 3V) - enables multi-year operation in energy-constrained IoT endpoints |
| Reference | Internal 2.5V ±30ppm/°C - eliminates external reference component and layout area |
| Interface | SPI/QSPI/MICROWIRE 3-wire serial - reduces MCU pin count and simplifies PCB routing |
Pinout & Package
MAX1240ACSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+ suffix), with 1.27mm pitch and JEDEC MS-012AC footprint.
| 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 0V to VREF (2.5V) sampling node; input capacitance 16pF |
| SHDN (Pin 3) | Three-level control input | Low = 2µA shutdown; high = internal reference enabled; open = external reference mode |
| REF (Pin 4) | Reference terminal | 2.5V output (internal ref active); bypass with 4.7µF capacitor for stability |
| GND (Pin 5) | Analog/digital common ground | Single-point star-ground connection required to minimize noise coupling |
| SCLK (Pin 6) | Serial clock input | Accepts up to 2.1MHz clock; minimum pulse width 200ns per edge |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance |
| 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 ±0.5 LSB gain error; ±30ppm/°C drift - eliminates need for external precision reference IC |
| Ultra-low power operation | 3.7µW at 73ksps (VDD = 3V); 2µA shutdown current - extends battery life in remote sensors |
| Fast track/hold acquisition | 1.5µs tACQ - supports accurate sampling of fast-rising transients without external hold capacitor |
| 3-wire serial interface | No MISO/MOSI complexity; direct GPIO compatibility - reduces firmware overhead and BOM cost |
| Single-supply operation | +2.7V to +3.6V - interoperable with 3.3V microcontrollers and low-voltage battery systems |
Applications
| Battery-Powered Sensor Node | Portable Data Logger |
|---|---|
Use Scenario: Continuous temperature/humidity monitoring in wireless environmental sensors powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from thermistors and capacitive humidity sensors at 1–10Hz rates. Use Value: 2µA shutdown current and 3.7µW active power enable >5-year battery life; internal reference removes calibration dependency on external components. |
Use Scenario: Handheld industrial logger capturing vibration, pressure, and current waveforms during field maintenance. IC Role / Device Role / Timing Role: High-fidelity front-end ADC acquiring up to 73ksps with minimal board space and thermal rise. Use Value: 7.5µs conversion time and 1.5µs acquisition support undersampling of kHz-range signals; 8-pin SO footprint saves >40% PCB area vs. 16-pin alternatives. |
| Isolated Data Acquisition | Process Control Transmitter |
Use Scenario: 4–20mA loop-powered transmitter with galvanic isolation, measuring flow or level in hazardous zones. IC Role / Device Role / Timing Role: Isolated-side ADC converting sensor bridge outputs before digital isolation and current-loop modulation. Use Value: Single +3.3V supply simplifies isolated DC-DC design; 3-wire interface minimizes isolation channel count and latency. |
Use Scenario: Smart valve positioner requiring local analog sensing of actuator feedback and supply voltage. IC Role / Device Role / Timing Role: Embedded ADC for closed-loop control diagnostics and health monitoring within tight thermal envelopes. Use Value: ±0.5 LSB INL ensures sub-0.012% measurement accuracy critical for PID tuning; internal reference guarantees repeatability across unit batches. |
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; 1MSPS max rate; 8-pin SOIC | Requires external reference and higher drive capability; better for high-speed but less optimized for ultra-low-power | Select when >100ksps sampling or wider supply range is needed; verify external reference stability and noise performance. |
| AD7476ARMZ | 2.35V–5.25V supply; no internal reference; 1MSPS; 8-pin MSOP; ±0.5 LSB INL | Lacks integrated reference and track/hold; needs external RC anti-alias filter and reference buffer | Choose for higher sampling rate and smaller MSOP package; add external 2.5V reference (e.g., REF192) if matching MAX1240ACSA+T's self-contained functionality. |
Compared with ADS7822U and AD7476ARMZ, the MAX1240ACSA+T uniquely integrates a stable 2.5V reference and fast track/hold in an ultra-low-power 8-pin SO package - reducing system-level BOM count, layout complexity, and calibration effort in space- and energy-constrained designs.
Availability
MAX1240ACSA+T is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, and isolated data acquisition requiring stable component supply across extended production lifecycles.
Supply support for MAX1240ACSA+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 series belongs to Maxim's precision data acquisition product line, designed specifically for low-power, space-constrained systems needing reliable 12-bit resolution without external support components.
FAQ
What is the operating temperature range for MAX1240ACSA+T?
The MAX1240ACSA+T is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating aligns with its AC-grade accuracy bin (±0.5 LSB INL) and makes it suitable for indoor industrial equipment, consumer test gear, and non-automotive portable electronics where extended temperature coverage is not required. The 'A' grade in the part number explicitly denotes this 0°C to +70°C range.
Does MAX1240ACSA+T require an external reference capacitor?
Yes, the MAX1240ACSA+T requires a 4.7µF capacitor connected between the REF pin and GND when using its internal 2.5V reference. This capacitor stabilizes the reference output and ensures specified INL and gain error performance. The datasheet specifies this value as mandatory for full accuracy; omitting it degrades reference regulation and increases conversion noise and drift.
Can MAX1240ACSA+T interface directly with a 5V microcontroller?
No - the MAX1240ACSA+T digital I/O pins (SCLK, CS, DOUT, SHDN) are not 5V-tolerant. They operate at VDD levels only (+2.7V to +3.6V), and applying 5V violates absolute maximum ratings (Digital Inputs to GND: –0.3V to +6V is a stress rating, not operational). Direct connection to 5V logic requires level-shifting circuitry to avoid damage or unreliable communication.
What is the minimum acquisition time for MAX1240ACSA+T?
The minimum acquisition time for MAX1240ACSA+T is 1.5µs, as guaranteed across temperature and supply voltage. This is the shortest time the internal track/hold circuit requires to settle the sampled analog voltage on its hold capacitor before conversion begins. Attempting shorter intervals risks incomplete settling and increased code-dependent errors beyond the ±0.5 LSB INL specification.
How does the SHDN pin affect the internal reference in MAX1240ACSA+T?
In the MAX1240ACSA+T, pulling SHDN high enables the internal 2.5V reference, making REF an active output. Leaving SHDN open disables the internal reference, placing REF in high-impedance mode and allowing use of an external reference. Pulling SHDN low forces full shutdown (2µA current), disabling both reference and conversion circuitry - the reference is inactive in all shutdown states.
MAX1240ACSA+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:
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1240ACSA+T FAQ
1.How can I place an order for MAX1240ACSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240ACSA+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 MAX1240ACSA+T reliable?
The price and inventory of MAX1240ACSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240ACSA+T is usually 5 days.
3.What payment methods are accepted for MAX1240ACSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240ACSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240ACSA+T?
MAX1240ACSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240ACSA+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 MAX1240ACSA+T?
For technical support, including MAX1240ACSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240ACSA+T requirements.
6.How does Aetrix verify that MAX1240ACSA+T is sourced from the original manufacturer or authorized distributors?
All MAX1240ACSA+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 MAX1240ACSA+T meets industry standards.
7.What is the process for return or replacement of MAX1240ACSA+T?
All MAX1240ACSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240ACSA+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 MAX1240ACSA+T part is unused and in its original packaging.
Return procedure for MAX1240ACSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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