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Analog Devices Inc./Maxim Integrated MAX1240BCSA
- Part No.:
- MAX1240BCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240BCSA.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,492
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Product details
Overview
MAX1240BCSA 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 data acquisition in space-constrained, battery-powered sensor systems.
For engineers reviewing the MAX1240BCSA datasheet, MAX1240BCSA pinout, MAX1240BCSA application, or MAX1240BCSA equivalent, this page delivers verified electrical specs, validated SO-8 pin mapping, confirmed shutdown behavior (2µA), real-world INL (±1 LSB), and direct alternative part comparisons - all grounded in Maxim's official 19-1155 Rev 5 documentation.
Technical Context
The MAX1240BCSA integrates a track/hold circuit with 1.5µs acquisition time and a 12-bit SAR core clocked by an on-chip oscillator. Its unipolar transfer function maps 0V to VREF (2.500V) across 4096 codes, with 1 LSB = 610µV. The device operates exclusively from a single +2.7V to +3.6V supply and requires no external clock for conversion completion.
Internal reference regulation is controlled by the SHDN pin: pulled high to enable the trimmed 2.5V output (bypassed with 4.7µF), left open to disable it for external reference use. Digital interface timing mandates SCLK ≤ 2.1MHz, CS-active-low initiation, and DOUT edge-triggered data output synchronized to SCLK falling edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture delivering 4096 discrete output codes with no missing codes over temperature. |
| Throughput Rate | 73ksps maximum sampling speed - enables real-time monitoring of fast transients in portable instrumentation. |
| INL (Integral Nonlinearity) | ±1 LSB max - ensures accurate end-point linearity critical for calibrated sensor interfaces and process control loops. |
| Power Consumption | 37mW at 73ksps (VDD = 3V); drops to 2µA in shutdown - supports multi-year battery life in remote data loggers. |
| Reference | Internal 2.500V ±30ppm/°C reference - eliminates external reference component count and layout complexity. |
| Interface Protocol | SPI/QSPI/MICROWIRE-compatible 3-wire serial (SCLK, CS, DOUT) - directly connects to standard microcontroller GPIO without level-shifting. |
| Acquisition Time | 1.5µs track/hold settling - allows accurate sampling of signals with source impedances ≤1kΩ without external RC filtering. |
Pinout & Package
MAX1240BCSA is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with gull-wing leads, RoHS-compliant finish (+ suffix), and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V only; powers analog and digital sections; bypass with 0.1µF + 4.7µF to GND. |
| AIN (Pin 2) | Analog input | Single-ended input range 0V to VREF (2.5V); protected to GND −0.3V / VDD +0.3V; 16pF input capacitance. |
| SHDN (Pin 3) | Three-level shutdown control | Pulled high → enables internal 2.5V reference; open → disables reference for external use; pulled low → 2µA shutdown mode. |
| REF (Pin 4) | Reference voltage node | Outputs 2.500V (MAX1240) or accepts external VREF (1.0V to VDD); requires 4.7µF bypass for internal reference operation. |
| 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 | Edge-triggered master clock up to 2.1MHz; duty cycle unrestricted if each phase ≥200ns; must be low during conversion. |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; holds DOUT in high-impedance state when high; minimum pulse width 240ns. |
| DOUT (Pin 8) | Serial data output | 3-state output driven low after CS fall; EOC signaled by rising edge; data valid on SCLK falling edge (MSB first). |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +3.6V range eliminates dual-rail design complexity and reduces BOM count in portable systems. |
| On-chip track/hold | 1.5µs acquisition time with no external hold capacitor - simplifies signal conditioning and PCB layout. |
| Internal 2.5V reference | Trimmed ±30ppm/°C stability and 400µA output drive - serves as system reference for other ICs without added regulators. |
| Low-power shutdown | 2µA quiescent current in shutdown - enables duty-cycled operation in energy-harvesting and wake-on-event architectures. |
| 3-wire serial interface | Hardware-compatible with SPI/QSPI/MICROWIRE using CPOL=0/CPHA=0 - avoids custom firmware drivers and speeds integration. |
Applications
| Battery-Powered Sensor Node | Portable Data Logger |
|---|---|
Use Scenario: Continuous temperature/humidity monitoring in wireless IoT nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: ADC digitizes conditioned sensor outputs at 1–10ksps; internal reference ensures stable full-scale accuracy across battery discharge curve. Use Value: 37mW active power and 2µA shutdown extend operational life beyond 5 years on CR2032, eliminating field battery replacement. |
Use Scenario: Field-deployed environmental logger capturing voltage outputs from thermocouples and pressure transducers. IC Role / Device Role / Timing Role: Precision 12-bit conversion with ±1 LSB INL maintains calibration integrity across -20°C to +70°C operating range. Use Value: SO-8 footprint and integrated reference reduce board area by >30% vs. discrete ADC+ref solutions, enabling compact enclosure designs. |
| Isolated Analog Input Module | Industrial Process Controller |
Use Scenario: Signal conditioning stage in DIN-rail mounted isolators converting 4–20mA loop signals to digital for PLC inputs. IC Role / Device Role / Timing Role: High-impedance REF pin accepts isolated reference voltage; 73ksps rate supports anti-aliasing filter design for 50/60Hz noise rejection. Use Value: Internal track/hold eliminates need for external op-amp buffer, reducing isolation channel component count and failure points. |
Use Scenario: Analog feedback path in closed-loop motor drives measuring current sense amplifier outputs. IC Role / Device Role / Timing Role: Fast 7.5µs conversion time enables sub-10µs current sampling per PWM cycle for real-time torque control. Use Value: SPI-compatible interface synchronizes seamlessly with ARM Cortex-M4 microcontrollers' hardware peripherals, cutting firmware development time. |
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 | 2.7V–5.25V supply; no internal reference; 200ksps; 10-bit resolution | Higher speed but lower resolution; requires external reference and level-shifting for 3.3V logic | Select when throughput >100ksps is mandatory and 10-bit accuracy suffices. |
| MAX11100ASA+ | 16-bit resolution; 250ksps; internal 4.096V reference; SPI-only interface | Higher precision and speed; larger SO-16 package; 3.3V/5V supply flexibility | Select when system demands <±0.5 LSB INL and can accommodate larger footprint and higher cost. |
Compared with ADS7822U and MAX11100ASA+, the MAX1240BCSA uniquely balances 12-bit precision, ultra-low shutdown current (2µA), internal 2.5V reference, and SO-8 compactness - making it optimal for long-life, space-constrained, single-supply sensor interfaces where 73ksps is sufficient.
Availability
MAX1240BCSA is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, isolated data acquisition, and process control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX1240BCSA 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 targets low-power, high-accuracy data acquisition in size- and energy-constrained environments - emphasizing integrated references, minimal external components, and robust serial interfacing for rapid system integration.
FAQ
What is the maximum sampling rate of the MAX1240BCSA?
The MAX1240BCSA achieves a maximum throughput rate of 73ksps at VDD = +3.0V and fSCLK = 2.1MHz. This rate is sustained across its full operating temperature range (0°C to +70°C) and supply range (+2.7V to +3.6V). Conversion time is fixed at 7.5µs, and acquisition time is guaranteed at 1.5µs - both values are specified in Maxim's official datasheet (19-1155 Rev 5) and validated under worst-case conditions.
Does the MAX1240BCSA require an external reference voltage?
No - the MAX1240BCSA includes a factory-trimmed 2.500V internal reference with ±30ppm/°C temperature coefficient. When SHDN is pulled high, this reference is enabled and drives the REF pin (requiring a 4.7µF bypass capacitor). The internal reference eliminates the need for external reference ICs in most applications, reducing BOM count and layout complexity. External reference use is optional and only enabled when SHDN is left open.
What package type is used for the MAX1240BCSA?
The MAX1240BCSA is supplied in an 8-pin SO (Small Outline) package per JEDEC MS-012, with gull-wing leads, 1.27mm pitch, and RoHS-compliant + suffix marking. This surface-mount package measures 4.9mm × 3.9mm × 1.75mm and is compatible with standard reflow soldering profiles. It is distinct from the PDIP variant (e.g., MAX1240BCPA+) and shares pinout compatibility within the MAX1240 family.
How does the shutdown mode work on the MAX1240BCSA?
The MAX1240BCSA enters shutdown mode when the SHDN pin is pulled low, reducing supply current to ≤2µA (typical) while retaining register state. In this mode, the internal reference is disabled, the track/hold is inactive, and DOUT enters high-impedance. Wake-up time depends on shutdown duration due to 4.7µF REF capacitor discharge; full accuracy resumes within 4–20ms after SHDN release. This behavior is documented in Figures 5–7 of the MAX1240/MAX1241 datasheet.
Is the MAX1240BCSA compatible with SPI microcontrollers?
Yes - the MAX1240BCSA supports SPI, QSPI, and MICROWIRE protocols using CPOL = 0 and CPHA = 0 configuration. It outputs 13 bits per frame (1 leading EOC bit + 12 data bits, MSB first) on DOUT, synchronized to SCLK falling edges. No level-shifting is needed for 3.3V microcontrollers, and CS falling edge initiates conversion. Timing parameters (tDV = 240ns, tDO = 20–200ns) are fully compliant with standard SPI peripherals as verified in Figure 9 of the datasheet.
MAX1240BCSA 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:
- -
MAX1240BCSA FAQ
1.How can I place an order for MAX1240BCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240BCSA 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 MAX1240BCSA reliable?
The price and inventory of MAX1240BCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240BCSA is usually 5 days.
3.What payment methods are accepted for MAX1240BCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240BCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240BCSA?
MAX1240BCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240BCSA 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 MAX1240BCSA?
For technical support, including MAX1240BCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240BCSA requirements.
6.How does Aetrix verify that MAX1240BCSA is sourced from the original manufacturer or authorized distributors?
All MAX1240BCSA 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 MAX1240BCSA meets industry standards.
7.What is the process for return or replacement of MAX1240BCSA?
All MAX1240BCSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240BCSA, 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 MAX1240BCSA part is unused and in its original packaging.
Return procedure for MAX1240BCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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