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Analog Devices Inc./Maxim Integrated MAX1241BCPA+
- Part No.:
- MAX1241BCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1241BCPA+.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,902
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Product details
Overview
The MAX1241BCPA+ from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (ADC) operating from a single +2.7V to +5.25V supply. It features a 7.5µs conversion time, 73ksps throughput, internal track/hold, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. Designed for space-constrained, battery-powered data acquisition, it accepts 0V to VREF analog inputs and requires an external reference voltage.
For engineers reviewing the MAX1241BCPA+ datasheet, MAX1241BCPA+ pinout, MAX1241BCPA+ application, or MAX1241BCPA+ equivalent, key selection considerations include its 8-pin PDIP package, ±1 LSB INL accuracy at 0°C to +70°C, 2.25MHz small-signal bandwidth, shutdown current of ≤2µA, and compatibility with microcontroller I/O ports without level-shifting.
Technical Context
The MAX1241BCPA+ implements a capacitive SAR architecture with integrated track/hold, eliminating need for external hold capacitors. Its conversion cycle begins on CS falling edge, completes in 7.5µs, and outputs unipolar 12-bit data with leading EOC bit via DOUT on SCLK falling edges.
It operates exclusively with an external reference applied to the REF pin (no internal reference), supports input ranges from 0V to VREF where VREF ≤ VDD, and maintains specified DC accuracy only when external reference output impedance is ≤10Ω and load current capability ≥250µA during conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale range |
| INL (Integral Nonlinearity) | ±1 LSB - ensures monotonicity and ≤0.024% full-scale error after calibration |
| Throughput Rate | 73 ksps - supports real-time sampling of signals up to ~36.5 kHz Nyquist bandwidth |
| Conversion Time | 7.5 µs - fixed latency from CS fall to DOUT high (EOC), enabling deterministic timing control |
| Supply Voltage Range | +2.7V to +5.25V - enables direct interfacing with 3.3V and 5V logic systems without regulators |
| Shutdown Current | ≤2 µA - reduces average power in intermittent-sampling applications such as sensor wake-up systems |
| Small-Signal Bandwidth | 2.25 MHz - allows accurate digitization of fast transients and undersampling of higher-frequency signals |
Pinout & Package
MAX1241BCPA+ 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; bypass with 0.1µF + 4.7µF capacitors to GND |
| AIN (Pin 2) | Analog input | Single-ended input for 0V to VREF signals; input protection clamps to GND–0.3V and VDD+0.3V |
| SHDN (Pin 3) | Three-level shutdown control | Pull low for ≤2µA shutdown; high or open for normal operation; no internal reference enable function (MAX1241 only) |
| REF (Pin 4) | External reference input | Accepts 1.0V to VDD reference voltage; requires ≤10Ω source impedance and ≥250µA drive capability during conversion |
| GND (Pin 5) | Analog and 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 clock; duty cycle unrestricted if each phase ≥200ns; must remain low during conversion |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode; minimum pulse width 240ns |
| DOUT (Pin 8) | Serial data output | 3-wire interface output; MSB-first unipolar format with leading EOC bit; transitions on SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| 3-wire serial interface | Fully compatible with SPI, QSPI, and MICROWIRE protocols using CPOL=0/CPHA=0; eliminates need for additional interface logic |
| Internal track/hold | Acquires signal in 1.5µs; removes requirement for external sample-and-hold circuitry and associated layout complexity |
| Low-power shutdown mode | Reduces supply current to ≤2µA; enables energy-efficient operation in battery-powered sensor nodes with duty-cycled sampling |
| Wide supply range | Operates from +2.7V to +5.25V; supports direct integration into mixed-voltage systems without level translation or dedicated LDOs |
| High-speed conversion | 73ksps throughput with 7.5µs conversion time; suitable for real-time monitoring of dynamic physical parameters |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensors |
|---|---|
Use Scenario: Continuous voltage/current measurement in portable environmental monitors powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary ADC converting conditioned sensor outputs to digital values for microcontroller processing and wireless transmission. Use Value: 2µA shutdown current extends battery life; 73ksps rate captures transient events; 8-pin PDIP simplifies compact PCB layout. |
Use Scenario: Analog signal digitization in DIN-rail mounted temperature or pressure transmitters with galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side ADC acquiring sensor signals before optocoupler or digital isolator transmission to host controller. Use Value: External reference support enables precise ratiometric measurements with isolated reference sources; 2.25MHz bandwidth accommodates anti-alias filter design. |
| Portable Medical Instrumentation | Process Control Loop Interfaces |
Use Scenario: ECG or pulse oximetry front-end where low power and small size are critical for wearable form factors. IC Role / Device Role / Timing Role: Signal-chain ADC capturing amplified biopotential waveforms prior to digital filtering and analysis. Use Value: ±1 LSB INL ensures clinical-grade linearity; 12-bit resolution provides adequate dynamic range for physiological signals; 8-pin SO/PDIP eases hand-soldering during prototyping. |
Use Scenario: Analog input module in PLC I/O cards digitizing 4–20mA or 0–10V process signals in factory automation systems. IC Role / Device Role / Timing Role: Precision ADC interfacing with op-amp conditioning circuits and microcontroller-based control algorithms. Use Value: 7.5µs conversion time enables tight control loop timing; wide supply range accommodates industrial 5V or 3.3V backplane voltages; robust ESD tolerance supports harsh environments. |
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 | 8-pin SOIC; 12-bit; 200ksps; internal reference; SPI-only interface; 2.7V–5.25V supply | Includes internal 2.5V reference; lacks SHDN pin; higher speed but higher power (1.25mW @ 200ksps) | Select when internal reference simplifies BOM and higher throughput is needed; avoid when ultra-low shutdown current is mandatory. |
| AD7893ARZ-10 | 16-pin SOIC; 12-bit; 100ksps; external reference; SPI-compatible; 5V-only supply | Larger package; requires 5V supply only; ±0.5 LSB INL; no shutdown mode | Select when tighter INL (±0.5 LSB) and higher throughput justify larger footprint and absence of shutdown capability. |
Compared with ADS7822U and AD7893ARZ-10, the MAX1241BCPA+ uniquely balances ultra-low shutdown current (≤2µA), 8-pin PDIP compactness, and external reference flexibility-making it optimal for cost-sensitive, battery-operated, or space-constrained industrial sensing nodes requiring long-term stability without reference trimming.
Availability
MAX1241BCPA+ is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensors, portable medical instrumentation, and process control loop interfaces requiring stable component supply across extended production cycles.
Supply support for MAX1241BCPA+ 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/MAX1241 family was designed specifically for low-power, space-constrained data acquisition systems requiring precision 12-bit conversion with minimal external components and microcontroller-friendly serial interfacing.
FAQ
What is the reference voltage requirement for MAX1241BCPA+?
The MAX1241BCPA+ requires an external reference voltage applied to the REF pin, ranging from +1.0V to VDD. For full 12-bit accuracy, the reference source must provide ≥250µA DC current during conversion and maintain output impedance ≤10Ω. A minimum 0.1µF ceramic bypass capacitor is required at REF; a 4.7µF capacitor is recommended if the reference is noisy or high-impedance. The MAX1241BCPA+ does not include an internal reference.
Does MAX1241BCPA+ support SPI, QSPI, and MICROWIRE protocols?
Yes, the MAX1241BCPA+ serial interface is fully compatible with SPI, QSPI, and MICROWIRE standards when configured with CPOL = 0 and CPHA = 0. It uses a 3-wire interface (SCLK, CS, DOUT) with MSB-first unipolar output format, including a leading end-of-conversion (EOC) bit. Clock rates up to 2.1MHz are supported, and no external level-shifting is needed for standard 3.3V or 5V microcontrollers.
What is the maximum allowable source impedance for the AIN pin on MAX1241BCPA+?
The MAX1241BCPA+ AIN pin has an input capacitance of 16pF and an effective input resistance of 9kΩ. To meet the 1.5µs acquisition time specification, the total source impedance (RS + RIN) must satisfy tACQ = 9(RS + RIN) × 16pF ≤ 1.5µs. For RS < 1kΩ, AC performance remains unaffected; above 1kΩ, acquisition time increases linearly. A 0.01µF capacitor at AIN is recommended for high-impedance sources to stabilize sampling.
How does the SHDN pin function on MAX1241BCPA+?
On the MAX1241BCPA+, the SHDN pin operates as a three-level control: pulling it low places the device in shutdown mode with ≤2µA supply current; leaving it open or pulling it high enables normal operation. Unlike the MAX1240, the SHDN pin on MAX1241BCPA+ does not enable or disable an internal reference-it is solely a power-control signal. No external pull-up is required for reliable operation.
What are the absolute maximum ratings for MAX1241BCPA+ analog input voltage?
The MAX1241BCPA+ AIN pin has an absolute maximum rating of –0.3V to (VDD + 0.3V). However, for accurate conversions near full scale, the input must stay within GND + 50mV to VDD – 50mV. Exceeding these limits risks measurement inaccuracy-even if within absolute ratings-and may cause current flow through internal protection diodes. If input exceeds ±50mV beyond rails, limit current to ≤2mA using series resistance.
MAX1241BCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1241BCPA+ FAQ
1.How can I place an order for MAX1241BCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1241BCPA+ 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 MAX1241BCPA+ reliable?
The price and inventory of MAX1241BCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1241BCPA+ is usually 5 days.
3.What payment methods are accepted for MAX1241BCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1241BCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1241BCPA+?
MAX1241BCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1241BCPA+ 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 MAX1241BCPA+?
For technical support, including MAX1241BCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1241BCPA+ requirements.
6.How does Aetrix verify that MAX1241BCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX1241BCPA+ 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 MAX1241BCPA+ meets industry standards.
7.What is the process for return or replacement of MAX1241BCPA+?
All MAX1241BCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1241BCPA+, 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 MAX1241BCPA+ part is unused and in its original packaging.
Return procedure for MAX1241BCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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