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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:2,106
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Product details
Overview
The MAX1240CCSA+ from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (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 1.9mA typical supply current at 73ksps, and features integrated track/hold with 1.5µs acquisition time-ideal for battery-powered sensor nodes and portable data loggers.
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 acquisition and instrumentation, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX1240CCSA+ implements a fully integrated SAR architecture with on-chip track/hold, internal 2.5V reference trimmed to ±30ppm/°C, and unipolar 0V–VREF input range. Its conversion sequence is initiated by CS falling edge, with end-of-conversion signaled by DOUT high, enabling precise timing control in microcontroller-based systems.
It supports three-level shutdown via SHDN pin: pulled low for ≤15µA shutdown current, high to enable internal reference, or open to disable internal reference and accept external VREF. The 3-wire serial interface requires no external clock for conversion-only for data readout-and tolerates SCLK duty cycles ≥200ns per phase up to 2.1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with no missing codes over temperature |
| Throughput Rate | 73ksps - enables 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 precision measurement |
| Supply Voltage Range | +2.7V to +3.6V - compatible with single-cell Li-ion and 3.3V logic rails without level shifting |
| Reference | Internal 2.5V ±0.5% - eliminates external reference component count and layout complexity |
| Power Consumption | 1.9mA @ 73ksps (VDD = 3.6V) - enables >100-hour operation on 700mAh coin cell at 1ksps with shutdown cycling |
| Acquisition Time | 1.5µs - allows sampling of fast transients and supports multiplexed multi-channel designs with minimal dead time |
Pinout & Package
MAX1240CCSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead(Pb)-free, with standard JEDEC MS-012AC footprint (5.0mm × 4.0mm, 1.27mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog core, digital logic, and internal reference |
| AIN (Pin 2) | Analog input | Unipolar 0V to VREF sampling node; input capacitance 16pF, protected to GND−0.3V/VDD+0.3V |
| SHDN (Pin 3) | Three-state shutdown control | Pulled low → 15µA shutdown; high → enables internal 2.5V reference; open → disables reference for external VREF use |
| REF (Pin 4) | Reference voltage terminal | Outputs 2.5V (MAX1240) or accepts external VREF (1.0V to VDD); requires 4.7µF bypass for internal reference stability |
| 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 | Asynchronous clock for data readout only; supports up to 2.1MHz; no clock needed during conversion |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; holds DOUT in high-impedance state when high |
| DOUT (Pin 8) | Serial data output | 3-wire unidirectional output; MSB-first format with leading EOC bit; transitions on SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail design complexity and reduces BOM cost in space-constrained portable systems |
| Integrated track/hold | Removes need for external hold capacitor and driver op-amp, simplifying signal chain design |
| SPI/QSPI/MICROWIRE compatibility | Direct connection to standard MCU serial peripherals without protocol translation or glue logic |
| Internal 2.5V reference | Guarantees ±0.5% initial accuracy and ±30ppm/°C drift-sufficient for 12-bit accuracy without calibration |
| Low-power shutdown mode | Reduces supply current to ≤15µA, enabling µA-level average power in duty-cycled sensor applications |
Applications
| Battery-Powered Data Logger | Isolated Industrial Sensor Interface |
|---|---|
Use Scenario: Continuous 1ksps voltage monitoring of thermocouple amplifier outputs in handheld environmental meters. IC Role / Device Role / Timing Role: ADC front-end digitizing conditioned analog signals; provides deterministic 7.5µs conversion time and EOC framing for low-overhead µC polling. Use Value: 1.9mA active current and 15µA shutdown enable >1-year battery life on CR2032; internal reference removes calibration dependency across temperature. |
Use Scenario: Analog input stage in DIN-rail mounted PLC I/O module with opto-isolated digital control lines. IC Role / Device Role / Timing Role: Isolated-side ADC converting 4–20mA loop signals; uses CS-controlled conversion start to synchronize with master controller timing. Use Value: 1.5µs track/hold acquisition supports accurate sampling of fast step inputs; 8-pin SO footprint minimizes isolation barrier PCB area. |
| Portable Medical Instrumentation | Process Control Transmitter |
Use Scenario: ECG signal digitization in wearable patch monitors requiring ultra-low power and small form factor. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC capturing biopotential waveforms; internal reference avoids drift-induced baseline wander. Use Value: ±1 LSB INL and 70dB SINAD ensure diagnostic-grade fidelity; RoHS-compliant SO package meets medical regulatory requirements. |
Use Scenario: Smart pressure transmitter with HART communication, where ADC digitizes bridge sensor output before digital compensation. IC Role / Device Role / Timing Role: Precision front-end ADC providing stable 12-bit resolution under varying supply and temperature conditions. Use Value: Internal 2.5V reference with ±30ppm/°C TC enables <0.05%FS error over −25°C to +70°C without external trimming. |
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, no internal reference, requires external REF and VREF/2 bias network | Higher speed but lacks integrated reference and track/hold; needs additional support components | Select when higher throughput is critical and board space allows external reference circuitry |
| MAX11100ETE+ | 12-bit, 1MSPS, +2.7V to +3.6V, internal 2.048V reference, SPI-only interface, 12-pin TDFN package | Higher speed and smaller package but incompatible pinout and different reference voltage | Select for space-constrained, high-speed applications where 2.048V reference aligns with system scaling |
Compared with MAX1240CCSA+, ADS7822U offers higher speed but increases BOM count and layout complexity due to missing internal reference and track/hold, while MAX11100ETE+ provides faster sampling in a smaller package but requires redesigning reference scaling and PCB layout-neither is pin-compatible or drop-in.
Availability
MAX1240CCSA+ 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 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 markets.
The MAX1240 series belongs to Maxim's precision low-power ADC product line, designed specifically for space- and energy-constrained measurement systems requiring integrated reference, small footprint, and robust serial interfacing.
FAQ
What is the maximum sampling rate of the MAX1240CCSA+?
The MAX1240CCSA+ achieves a maximum throughput rate of 73ksps, corresponding to a 7.5µs conversion time. This rate is guaranteed under specified conditions: VDD = +2.7V to +3.6V, fSCLK = 2.1MHz, and TA = 0°C to +70°C. At lower sampling rates (e.g., 1ksps), supply current drops to 1.4mA, enabling extended battery life in duty-cycled applications. The MAX1240CCSA+ maintains full 12-bit performance across its entire rated speed range.
Does the MAX1240CCSA+ require an external reference voltage?
No, the MAX1240CCSA+ includes a factory-trimmed internal 2.5V reference with ±0.5% initial accuracy and ±30ppm/°C temperature coefficient-fully sufficient for 12-bit accuracy without external components. The internal reference is enabled when SHDN is pulled high. If an external reference is preferred, SHDN can be left open to disable the internal reference, allowing VREF from 1.0V to VDD to be applied at the REF pin. The MAX1240CCSA+ datasheet confirms internal reference functionality for this specific variant.
What package type is used for the MAX1240CCSA+?
The MAX1240CCSA+ is supplied in an 8-pin SO (Small Outline) package, RoHS-compliant and lead(Pb)-free, with JEDEC MS-012AC dimensions (5.0mm × 4.0mm body, 1.27mm lead pitch). This package is pin-compatible with other MAX1240 variants in SO format (e.g., MAX1240BCSA+, MAX1240ACSA+) and supports standard reflow soldering profiles up to +260°C. The '+' suffix in the part number explicitly denotes the lead-free SO packaging.
How does the shutdown mode function on the MAX1240CCSA+?
The MAX1240CCSA+ implements a three-state SHDN pin: pulling it low reduces supply current to ≤15µA; pulling it high enables the internal 2.5V reference; leaving it open disables the internal reference for external VREF use. Shutdown wake-up time depends on reference capacitor discharge-typically <4µs for external reference use, but up to 20ms after deep shutdown when using the internal 4.7µF bypass cap. This behavior is confirmed in the MAX1240CCSA+ datasheet Figure 7 and Electrical Characteristics table.
Is the MAX1240CCSA+ compatible with SPI microcontrollers?
Yes, the MAX1240CCSA+ is fully compatible with SPI, QSPI, and MICROWIRE interfaces. It requires CPOL = 0 and CPHA = 0 configuration, uses CS falling edge to initiate conversion, and outputs data MSB-first on DOUT with EOC bit leading the 12-bit result. The interface operates at clock rates up to 2.1MHz and tolerates unrestricted duty cycle as long as each phase exceeds 200ns-verified in the MAX1240CCSA+ timing diagrams (Figures 8–9) and Applications Information section.
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:
- 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:
- 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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