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Analog Devices Inc./Maxim Integrated MAX1240CCSA
- Part No.:
- MAX1240CCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240CCSA.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,724
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Product details
Overview
MAX1240CCSA 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 signal acquisition in space-constrained, battery-powered sensor nodes.
For engineers reviewing the MAX1240CCSA datasheet, MAX1240CCSA pinout, MAX1240CCSA application, or MAX1240CCSA equivalent, this page delivers verified electrical specs, package mapping to 8-pin SO, functional pin roles, real-world use cases in isolated data acquisition and portable instrumentation, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX1240CCSA implements a track/hold circuit with 1.5µs acquisition time and a 12-bit SAR core clocked by an on-chip oscillator. It operates from a single +2.7V to +3.6V supply and uses unipolar binary output coding with end-of-conversion (EOC) signaling via DOUT high transition.
Its internal 2.5V reference is trimmed to ±30ppm/°C and requires a 4.7µF bypass capacitor at REF; SHDN pin controls both shutdown mode (≤2µA) and internal reference enable/disable. The 3-wire serial interface supports up to 2.1MHz SCLK with no duty-cycle restriction beyond 200ns minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale input range. |
| Throughput Rate | 73ksps - supports real-time sampling of signals up to ~36.5kHz Nyquist bandwidth. |
| INL (Integral Nonlinearity) | ±1 LSB - ensures monotonicity and ≤0.024% full-scale error for calibrated systems. |
| Supply Voltage Range | +2.7V to +3.6V - enables direct operation from single-cell Li-ion or 3.3V rail without regulation. |
| Power Consumption | 3.7µW at 73ksps (VDD = 3V) - allows continuous sensing in ultra-low-power IoT endpoints. |
| Reference | Internal 2.5V ±0.5% (25°C), ±30ppm/°C drift - eliminates external reference component and layout area. |
| Aperture Jitter | <50ps - preserves SNR in high-frequency sampling applications such as undersampling. |
Pinout & Package
MAX1240CCSA is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, 150 mil body width, and RoHS-compliant lead finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog and digital sections; requires 0.1µF + 4.7µF bypassing. |
| AIN (Pin 2) | Analog input | Single-ended input referenced to GND; 0V to VREF range; 16pF input capacitance; max source impedance 1kΩ for full AC performance. |
| SHDN (Pin 3) | Three-level shutdown control | Pulled high → enables internal 2.5V reference; open → disables reference for external REF use; pulled low → enters ≤2µA shutdown. |
| REF (Pin 4) | Reference voltage node | Output of internal 2.5V reference (MAX1240 only); must be bypassed with 4.7µF capacitor; supplies DAC and can source 400µA. |
| GND (Pin 5) | Analog/digital ground | Single-point star ground connection required; separates analog and digital return paths to minimize noise coupling. |
| DOUT (Pin 6) | Serial data output | 3-wire interface output; high-impedance when CS = high; transitions on SCLK falling edge; outputs EOC bit followed by 12-bit MSB-first data. |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion and enables DOUT; rising edge disables DOUT (high-Z); minimum pulse width 240ns. |
| SCLK (Pin 8) | Serial clock input | External clock up to 2.1MHz; clocks data out after conversion; minimum high/low pulse width 200ns; no duty cycle constraint beyond that. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +3.6V - eliminates dual-rail or charge-pump requirements in portable designs. |
| Integrated track/hold | 1.5µs acquisition time - removes need for external sample-and-hold IC or capacitor. |
| On-chip clock generator | Enables autonomous conversion timing - no external crystal or oscillator needed for basic operation. |
| 3-wire serial interface | Compatible with SPI/QSPI/MICROWIRE protocols using CPOL=0, CPHA=0 - simplifies µC firmware integration. |
| Low-power shutdown mode | ≤2µA supply current - extends battery life in duty-cycled sensor systems without external power gating. |
Applications
| Battery-Powered Sensor Node | Portable Data Logger |
|---|---|
Use Scenario: Continuous temperature/humidity monitoring in remote field deployments powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs at 1–10ksps; internal reference ensures stable scaling without external components. Use Value: 3.7µW active power and 2µA shutdown enable multi-year operation; 8-pin SO footprint minimizes PCB area in compact enclosures. |
Use Scenario: Handheld environmental recorder capturing voltage, current, and thermocouple readings during field inspections. IC Role / Device Role / Timing Role: Precision front-end ADC with 12-bit resolution and ±1 LSB INL for calibrated measurement accuracy across 0°C–70°C. Use Value: Internal 2.5V reference eliminates calibration drift vs. external references; SPI compatibility enables direct connection to low-pin-count microcontrollers. |
| Isolated Data Acquisition Channel | Industrial Process Monitoring |
Use Scenario: Signal conditioning stage downstream of digital isolators in PLC I/O modules measuring 4–20mA loop sensors. IC Role / Device Role / Timing Role: Isolated-side ADC converting isolated analog inputs; 3-wire interface crosses isolation barrier with minimal GPIO usage. Use Value: Low 16pF input capacitance and 1.5µs acquisition reduce burden on isolated driver stages; 73ksps supports oversampling for noise reduction. |
Use Scenario: Embedded analog input card in factory automation controllers acquiring pressure, flow, and level transducer signals. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC interfacing to multiplexed sensor arrays; internal reference stability (±30ppm/°C) maintains calibration over operating temperature. Use Value: ±1 LSB INL and 70dB SINAD ensure compliance with Class B industrial measurement standards; SO package supports automated reflow assembly. |
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 | 12-bit, 200ksps, +2.7V to +5.25V supply, external reference only, no internal T/H, requires external clock for conversion start. | Higher speed but lacks integrated track/hold and internal reference - demands additional support circuitry and tighter layout control. | Select when >100ksps sampling is required and system already provides stable external reference and clock resources. |
| MAX11100ASA+ | 12-bit, 1MSPS, +2.7V to +3.6V, internal reference, integrated T/H, SPI-compatible, but uses 10-pin µMAX package and consumes 2.5mA active current. | Higher throughput and same supply range, but 670× higher active power and different pinout - not drop-in replaceable. | Select when sampling rate >100ksps is critical and board space allows larger package; avoid if µA-level shutdown current is mandatory. |
Compared with ADS7822U and MAX11100ASA+, the MAX1240CCSA uniquely balances ultra-low power (3.7µW), integrated reference, and 8-pin SO compactness - making it optimal for long-life, size-constrained, single-supply sensor interfaces where 73ksps suffices.
Availability
MAX1240CCSA is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, isolated data acquisition, and industrial process control requiring stable component supply across extended production lifecycles.
Supply support for MAX1240CCSA 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, engineered specifically for low-power, small-footprint 12-bit ADC applications in portable and remote-sensing equipment.
FAQ
What is the maximum sampling rate of the MAX1240CCSA?
The MAX1240CCSA achieves a maximum throughput rate of 73ksps under specified conditions (VDD = +2.7V to +3.6V, fSCLK = 2.1MHz). This corresponds to a 7.5µs conversion time plus 1.5µs track/hold acquisition, enabling reliable sampling of signals up to ~36.5kHz. The MAX1240CCSA maintains full DC and AC specifications-including ±1 LSB INL and 70dB SINAD-at this rate.
Does the MAX1240CCSA require an external reference voltage?
No, the MAX1240CCSA includes a factory-trimmed 2.5V internal reference with ±0.5% initial accuracy and ±30ppm/°C temperature coefficient. When SHDN is pulled high, the internal reference is enabled and drives the REF pin - eliminating need for external reference components. An external reference may be used only if SHDN is left floating to disable the internal source.
What package type is used for the MAX1240CCSA?
The MAX1240CCSA is supplied in an 8-pin SO (Small Outline) package per JEDEC MS-012AC, with 150 mil body width, gull-wing leads, and RoHS-compliant + suffix finish. This surface-mount package supports automated PCB assembly and offers thermal and mechanical reliability suitable for industrial environments.
How does the shutdown mode function on the MAX1240CCSA?
The MAX1240CCSA enters shutdown mode when the SHDN pin is pulled low, reducing supply current to ≤2µA. In this state, the internal reference, track/hold, and conversion circuitry are disabled. Wake-up time depends on REF capacitor discharge: with 4.7µF bypass, recovery takes up to 20ms after SHDN release. Pulling SHDN high or leaving it open disables shutdown and enables normal operation.
Which microcontroller interfaces are compatible with the MAX1240CCSA serial port?
The MAX1240CCSA 3-wire serial interface is fully compatible with SPI, QSPI, and MICROWIRE protocols when configured with CPOL = 0 and CPHA = 0. It requires only three GPIO lines (SCLK, CS, DOUT) and supports clock rates up to 2.1MHz. No special controller peripherals are needed - standard bit-banged or hardware SPI peripherals can drive it with minimal firmware overhead.
MAX1240CCSA 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1240CCSA FAQ
1.How can I place an order for MAX1240CCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240CCSA 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 MAX1240CCSA reliable?
The price and inventory of MAX1240CCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240CCSA is usually 5 days.
3.What payment methods are accepted for MAX1240CCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240CCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240CCSA?
MAX1240CCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240CCSA 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 MAX1240CCSA?
For technical support, including MAX1240CCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240CCSA requirements.
6.How does Aetrix verify that MAX1240CCSA is sourced from the original manufacturer or authorized distributors?
All MAX1240CCSA 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 MAX1240CCSA meets industry standards.
7.What is the process for return or replacement of MAX1240CCSA?
All MAX1240CCSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240CCSA, 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 MAX1240CCSA part is unused and in its original packaging.
Return procedure for MAX1240CCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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