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Analog Devices Inc./Maxim Integrated MAX1240AESA/V+
- Part No.:
- MAX1240AESA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240AESA/V+.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,276
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Product details
Overview
MAX1240AESA/V+ 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 +2.7V to +3.6V, consumes only 3.7µW at full speed (73ksps), and features 1.5µs track/hold acquisition time. It is designed for space-constrained, battery-powered sensor interfaces requiring high accuracy and minimal power.
For engineers reviewing the MAX1240AESA/V+ datasheet, MAX1240AESA/V+ pinout, MAX1240AESA/V+ application, or MAX1240AESA/V+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in isolated data acquisition and portable instrumentation, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The MAX1240AESA/V+ implements a fully integrated SAR architecture with on-chip track/hold, internal clock, and unipolar binary output coding. Its 12-bit resolution achieves ±0.5 LSB INL and 70dB SINAD at 10kHz input, with aperture jitter <50ps and small-signal bandwidth of 2.25MHz.
It supports single-supply operation from +2.7V to +3.6V and includes a factory-trimmed 2.5V internal reference (±30ppm/°C tempco), enabled by pulling SHDN high. Shutdown mode reduces supply current to ≤2µA, with wake-up delay dependent on REF capacitor discharge time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale range |
| Throughput Rate | 73ksps - enables real-time sampling of signals up to ~36.5kHz Nyquist bandwidth |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error after calibration |
| Supply Voltage | +2.7V to +3.6V - compatible with single-cell Li-ion and 3.3V logic rails |
| Power Consumption | 3.7µW at 73ksps - allows continuous operation for years on coin-cell batteries |
| Reference | Internal 2.5V ±0.5% - eliminates external reference component and associated layout complexity |
| Interface | 3-wire SPI/QSPI/MICROWIRE - requires only SCLK, CS, DOUT; no MISO/MOSI direction control needed |
Pinout & Package
MAX1240AESA/V+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and automotive-qualified (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts +2.7V to +3.6V; powers analog and digital sections; bypass with 0.1µF + 4.7µF capacitors |
| AIN | Analog input | Single-ended input referenced to GND; accepts 0V to VREF (2.5V); max source impedance 1kΩ for full AC performance |
| SHDN | Three-level shutdown control | Pull low for ≤2µA shutdown; leave open to disable internal reference; pull high to enable internal 2.5V reference |
| REF | Reference voltage node | Outputs 2.5V (MAX1240); bypass with 4.7µF for stability; supplies internal DAC and can source up to 400µA |
| GND | Analog/digital ground | Single-point star ground required; separates analog and digital return paths to minimize noise coupling |
| SCLK | Serial clock input | External clock up to 2.1MHz; duty cycle unrestricted if each phase ≥200ns; clocks data out on falling edge |
| CS | Active-low chip select | Falling edge initiates conversion; holds DOUT in high-impedance when high; minimum pulse width 240ns |
| DOUT | Serial data output | Unipolar MSB-first format; leading '1' indicates end-of-conversion; transitions on SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Factory-trimmed ±0.5%, ±30ppm/°C drift - eliminates need for external reference IC and saves PCB area |
| 1.5µs track/hold acquisition | Enables accurate sampling of fast transients without external hold capacitor or timing-critical sequencing |
| 3-wire serial interface | Compatible with SPI/QSPI/MICROWIRE using CPOL=0/CPHA=0 - simplifies µC firmware and reduces GPIO count |
| 2µA shutdown current | Extends battery life in intermittent-sampling systems (e.g., wireless sensors) with sub-millisecond wake-up latency |
| Automotive temperature grade | –40°C to +85°C operating range with tested DC/AC specs - suitable for under-hood and industrial control environments |
Applications
| Battery-Powered Sensor Node | Portable Data Logger |
|---|---|
Use Scenario: Remote environmental monitoring using thermistor, RTD, or pressure sensor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary ADC digitizing analog sensor outputs; provides precise 12-bit readings synchronized to µC's low-power sleep/wake cycles. Use Value: 3.7µW active power and 2µA shutdown enable >5-year battery life at 1-sample-per-minute duty cycle. |
Use Scenario: Handheld device recording voltage, temperature, and humidity over hours with USB or BLE upload. IC Role / Device Role / Timing Role: High-accuracy front-end ADC interfacing directly to microcontroller I/O pins via 3-wire serial link. Use Value: Internal 2.5V reference and compact SO package reduce BOM count and board footprint vs. discrete reference + ADC solutions. |
| Isolated Industrial Data Acquisition | Process Control Transmitter |
Use Scenario: 4–20mA loop-powered field transmitter with galvanic isolation between sensor and host PLC. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned sensor signal before opto- or capacitive isolation barrier. Use Value: Low supply current minimizes isolated-side power draw; 73ksps rate supports oversampling for noise reduction in noisy plant environments. |
Use Scenario: Smart valve positioner or flow meter with local analog sensing and digital HART communication. IC Role / Device Role / Timing Role: Precision ADC feeding control algorithm in real-time embedded processor; references internal 2.5V for stable scaling. Use Value: ±0.5 LSB INL and 70dB SINAD ensure <0.02% measurement uncertainty critical for closed-loop process regulation. |
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 | 12-bit, 200ksps, +2.7V to +5.25V supply, no internal reference, requires external REF and VREF/2 bias network | Higher speed but lacks integrated reference; demands more external components and layout care for reference stability | Select when >100ksps throughput is required and system already provides precision external reference |
| MAX11100ASA+ | 12-bit, 1MSPS, +2.7V to +3.6V, internal 2.048V reference, SPI-compatible, 10-pin µMAX package | Higher speed and smaller package, but reference voltage differs (2.048V vs. 2.5V), affecting full-scale scaling and software calibration | Select when higher sampling rate is critical and system firmware can accommodate different reference voltage scaling |
Compared with MAX1240AESA/V+, ADS7822U offers higher speed but increases design complexity with external reference dependencies, while MAX11100ASA+ trades lower power efficiency for speed and uses a non-2.5V reference-requiring recalibration of gain coefficients in host firmware.
Availability
MAX1240AESA/V+ is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, and isolated data acquisition requiring stable component supply across automotive and industrial temperature ranges.
Supply support for MAX1240AESA/V+ 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, automotive, and medical applications.
The MAX1240 family targets ultra-low-power, high-accuracy data acquisition in size- and energy-constrained systems-emphasizing integrated references, minimal external components, and robust serial interfacing.
FAQ
What is the operating temperature range for MAX1240AESA/V+?
The MAX1240AESA/V+ is rated for –40°C to +85°C operation, with all DC and AC specifications guaranteed across this automotive-grade temperature range. This includes tested INL (±0.5 LSB), gain error (±0.5 LSB), and reference stability (±30ppm/°C), making it suitable for under-hood and industrial control environments where thermal cycling is expected.
Does MAX1240AESA/V+ require an external reference?
No, the MAX1240AESA/V+ includes a factory-trimmed 2.5V internal reference that is enabled by pulling the SHDN pin high. When used, it eliminates the need for external reference components. The internal reference is specified to ±0.5% initial accuracy and ±30ppm/°C temperature coefficient, and can source up to 400µA for auxiliary circuitry.
How does the shutdown mode work on MAX1240AESA/V+?
MAX1240AESA/V+ enters shutdown mode when the SHDN pin is pulled low, reducing supply current to ≤2µA. Pulling SHDN high enables the internal reference; leaving SHDN unconnected disables it, allowing external reference use. Wake-up time depends on REF capacitor discharge-typically <4µs for MAX1241, but up to 20ms for MAX1240 after extended shutdown due to 4.7µF bypass cap recharge.
Which microcontroller interfaces are compatible with MAX1240AESA/V+?
The MAX1240AESA/V+ 3-wire serial interface is fully compatible with SPI, QSPI, and MICROWIRE protocols using CPOL = 0 and CPHA = 0. It requires only SCLK, CS, and DOUT lines-no MISO/MOSI bidirectional control-and supports clock rates up to 2.1MHz. DOUT transitions on SCLK's falling edge, and data is output MSB-first with a leading end-of-conversion bit.
What is the maximum source impedance allowed at AIN for full accuracy?
For guaranteed AC performance (SINAD ≥70dB, THD ≤–80dB), the analog input source impedance must be ≤1kΩ. Higher impedances increase acquisition time per tACQ = 9(RS + 9kΩ) × 16pF, and may degrade noise and distortion. If RS > 1kΩ, a 0.01µF capacitor at AIN is recommended-but this forms an RC filter limiting input bandwidth.
MAX1240AESA/V+ 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/V+ FAQ
1.How can I place an order for MAX1240AESA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240AESA/V+ 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/V+ reliable?
The price and inventory of MAX1240AESA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240AESA/V+ is usually 5 days.
3.What payment methods are accepted for MAX1240AESA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240AESA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240AESA/V+?
MAX1240AESA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240AESA/V+ 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/V+?
For technical support, including MAX1240AESA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240AESA/V+ requirements.
6.How does Aetrix verify that MAX1240AESA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX1240AESA/V+ 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/V+ meets industry standards.
7.What is the process for return or replacement of MAX1240AESA/V+?
All MAX1240AESA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240AESA/V+, 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/V+ part is unused and in its original packaging.
Return procedure for MAX1240AESA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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