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Analog Devices Inc./Maxim Integrated MAX1240ACPA
- Part No.:
- MAX1240ACPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1240ACPA.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,164
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Product details
Overview
MAX1240ACPA 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 digitization in space-constrained, battery-powered sensor nodes.
For engineers reviewing the MAX1240ACPA datasheet, MAX1240ACPA pinout, MAX1240ACPA application, or MAX1240ACPA equivalent, this page delivers verified electrical specs, validated package mapping (8-pin PDIP), confirmed timing behavior (tACQ = 1.5µs, tCONV = 7.5µs), and real-world interface compatibility with microcontroller I/O ports - all critical for remote data acquisition and low-power embedded design.
Technical Context
The MAX1240ACPA integrates a track/hold amplifier and 12-bit SAR ADC core with on-chip clock generation and unipolar serial output encoding. Its internal 2.5V reference is trimmed to ±0.5 LSB INL and exhibits ±30 ppm/°C temperature coefficient over 0°C to +70°C.
Operation requires only three digital lines (SCLK, CS, DOUT), supports 2.1MHz max SCLK frequency, and features active-low chip select that initiates conversion on falling edge while placing DOUT in high-impedance state when CS is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise analog signal quantization |
| Throughput Rate | 73ksps - enables real-time sampling of signals up to ~36.5kHz Nyquist bandwidth |
| Conversion Time | 7.5µs - fixed latency from hold initiation to EOC assertion, enabling deterministic timing control |
| Track/Hold Acquisition | 1.5µs - minimum time required to capture stable analog input before conversion begins |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures monotonicity and <0.012% full-scale error across entire transfer function |
| Supply Voltage Range | +2.7V to +3.6V - compatible with single-cell Li-ion and 3.3V logic rails without level shifting |
| Power Consumption | 37mW at 73ksps (VDD = 3V) - supports extended operation in energy-harvesting and portable systems |
Pinout & Package
MAX1240ACPA is housed in an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, lead finish is lead(Pb)-free/RoHS-compliant (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog and digital sections; bypass with 0.1µF + 4.7µF capacitors |
| AIN (Pin 2) | Analog input | 0V to VREF unipolar range; input capacitance 16pF; source impedance ≤1kΩ recommended for full AC performance |
| SHDN (Pin 3) | Three-level shutdown control | Pull low → 2µA shutdown; leave open → disables internal reference; pull high → enables 2.5V reference |
| REF (Pin 4) | Reference voltage node | 2.5V output (MAX1240 only); requires 4.7µF bypass capacitor; supplies internal 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 |
| SCLK (Pin 6) | Serial clock input | Accepts up to 2.1MHz external clock; duty cycle unrestricted if each phase ≥200ns; must be held low during conversion |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; holds DOUT in high-Z when high; minimum pulse width 240ns |
| DOUT (Pin 8) | Serial data output | MSB-first unipolar format; EOC signaled by rising edge; transitions on SCLK falling edge; high-Z when CS = high |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Trimmed to ±0.5 LSB INL and ±30 ppm/°C drift - eliminates need for external reference component and reduces BOM count |
| 3-wire serial interface | Fully compatible with SPI™, QSPI™, and MICROWIRE™ protocols using CPOL=0/CPHA=0 - enables direct connection to standard MCU peripherals |
| Low-power shutdown mode | Reduces supply current to ≤2µA - extends battery life in intermittent-sampling applications such as environmental monitoring |
| On-chip track/hold | Acquires signal in 1.5µs with no external hold capacitor - simplifies layout and improves reliability in high-impedance sensor interfaces |
| Single-supply operation | Operates from +2.7V to +3.6V - matches common low-voltage system rails and avoids dual-supply complexity |
Applications
| Battery-Powered Sensor Node | Portable Data Logger |
|---|---|
Use Scenario: Continuous temperature/humidity sensing in field-deployed IoT nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: ADC digitizes analog outputs from precision sensors at 1–10ksps; internal reference ensures consistent scaling across temperature and supply variation. Use Value: 37mW active power and 2µA shutdown current enable multi-year operation on CR2032 cells without recharge infrastructure. |
Use Scenario: Handheld environmental recorder capturing voltage outputs from gas, pressure, and light sensors during field surveys. IC Role / Device Role / Timing Role: Serial ADC interfaces directly to ARM Cortex-M0+ MCU via GPIO bit-banged SPI; 7.5µs conversion enables rapid channel scanning. Use Value: 8-pin PDIP footprint and minimal external components (no external reference or hold cap) reduce PCB area and assembly cost in compact enclosures. |
| Isolated Data Acquisition Module | Industrial Process Monitoring |
Use Scenario: Signal conditioning stage in galvanically isolated analog input modules for PLC analog I/O cards. IC Role / Device Role / Timing Role: Digitizes isolated sensor signals post-optocoupler or transformer-based isolation; 1.5µs track/hold supports fast step-response capture. Use Value: Internal 2.5V reference eliminates need for isolated reference distribution, reducing component count and creepage/clearance design complexity. |
Use Scenario: Analog front-end for distributed control systems measuring 4–20mA loop signals, thermocouple outputs, and RTD bridges. IC Role / Device Role / Timing Role: ADC provides 12-bit resolution with ±0.5 LSB INL for accurate process variable representation in safety-critical feedback loops. Use Value: Guaranteed monotonicity and no missing codes over 0°C to +70°C ensure reliable closed-loop control without calibration drift-induced instability. |
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 SAR ADC with 200ksps throughput, external reference only, 2.7–5.25V supply, 8-pin SOIC package | Higher speed but no internal reference; requires external 2.5V reference and decoupling network | Select when >100ksps sampling is needed and board space allows extra reference IC |
| AD7810ARZ | 12-bit SAR ADC with 320ksps throughput, internal reference (2.5V), 2.7–5.25V supply, 8-pin SOIC package | Faster conversion (2.5µs), wider supply range, but higher typical IDD (1.5mA vs. 12.5mA at 73ksps) | Select when faster sampling and broader supply tolerance outweigh power budget constraints |
Compared with ADS7822U and AD7810ARZ, the MAX1240ACPA offers lowest active power at 73ksps (37mW @ 3V), guaranteed ±0.5 LSB INL over commercial temperature range, and PDIP packaging suited for prototyping and legacy through-hole assembly - making it optimal for ultra-low-power, cost-sensitive, and manually assembled applications.
Availability
MAX1240ACPA 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 long production lifecycles.
Supply support for MAX1240ACPA 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, medical, and communications applications.
The MAX1240 series belongs to Maxim's low-power serial ADC product line, engineered specifically for space- and energy-constrained measurement systems where accuracy, small footprint, and single-supply simplicity are essential.
FAQ
What is the maximum sampling rate of the MAX1240ACPA?
The MAX1240ACPA achieves a maximum throughput rate of 73ksps, corresponding to a 7.5µs conversion time and 1.5µs track/hold acquisition period. This rate is specified under conditions of VDD = +2.7V to +3.6V, fSCLK = 2.1MHz, and TA = 0°C to +70°C. The device maintains full 12-bit linearity and ±0.5 LSB INL at this speed, making MAX1240ACPA suitable for real-time monitoring of signals with up to ~36.5kHz bandwidth.
Does the MAX1240ACPA require an external reference voltage?
No, the MAX1240ACPA includes a factory-trimmed 2.5V internal reference with ±0.5 LSB INL and ±30 ppm/°C temperature coefficient - eliminating the need for external reference components. The internal reference is enabled by pulling the SHDN pin high; leaving SHDN open disables it and allows use of an external reference. This flexibility makes MAX1240ACPA adaptable to both simplified and high-precision configurations.
What package type is used for the MAX1240ACPA?
The MAX1240ACPA is supplied in an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and RoHS-compliant lead finish (denoted by the '+' suffix). This through-hole package supports manual soldering, breadboard prototyping, and legacy PCB assembly - distinguishing it from surface-mount variants like MAX1240ACSA+.
How does the shutdown mode function on the MAX1240ACPA?
The MAX1240ACPA enters ultra-low-power shutdown mode (<2µA supply current) when the SHDN pin is pulled low. In this state, the internal reference and ADC core are disabled, but the device retains its ability to wake up rapidly. Pulling SHDN high or leaving it open returns MAX1240ACPA to normal operation, with the internal reference enabled in the former case. This feature enables precise power gating in duty-cycled sensor systems.
Which microcontroller interfaces are compatible with the MAX1240ACPA serial interface?
The MAX1240ACPA supports SPI™, QSPI™, and MICROWIRE™ protocols using CPOL = 0 and CPHA = 0 configuration. It connects directly to standard MCU I/O ports via three wires (SCLK, CS, DOUT), requires no external level shifters for 3.3V systems, and tolerates SCLK frequencies up to 2.1MHz. Its MSB-first unipolar output format and EOC signaling via DOUT rising edge simplify firmware implementation across ARM, PIC, and RISC-V platforms.
MAX1240ACPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1240ACPA FAQ
1.How can I place an order for MAX1240ACPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240ACPA 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 MAX1240ACPA reliable?
The price and inventory of MAX1240ACPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240ACPA is usually 5 days.
3.What payment methods are accepted for MAX1240ACPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240ACPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240ACPA?
MAX1240ACPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240ACPA 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 MAX1240ACPA?
For technical support, including MAX1240ACPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240ACPA requirements.
6.How does Aetrix verify that MAX1240ACPA is sourced from the original manufacturer or authorized distributors?
All MAX1240ACPA 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 MAX1240ACPA meets industry standards.
7.What is the process for return or replacement of MAX1240ACPA?
All MAX1240ACPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240ACPA, 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 MAX1240ACPA part is unused and in its original packaging.
Return procedure for MAX1240ACPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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