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Analog Devices Inc./Maxim Integrated MAX1241BEPA+
- Part No.:
- MAX1241BEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1241BEPA+.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,278
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Product details
Overview
MAX1241BEPA+ from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (ADC) operating from +2.7V to +5.25V, featuring 73ksps throughput, 7.5µs conversion time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It requires an external reference voltage (0V to VREF input range), supports 1.5µs track/hold acquisition, and targets space-constrained, battery-powered data acquisition systems.
For engineers reviewing the MAX1241BEPA+ datasheet, MAX1241BEPA+ pinout, MAX1241BEPA+ application, or MAX1241BEPA+ equivalent, this page delivers verified electrical specs, validated pin functions, confirmed thermal and dynamic performance (SINAD = 70dB, THD = –80dB), real-world interface timing (fSCLK ≤ 2.1MHz), and precise supply current behavior across temperature and sampling rate.
Technical Context
The MAX1241BEPA+ implements a capacitive SAR architecture with integrated track/hold, eliminating need for external hold capacitors. Its analog front-end accepts inputs from 0V to VREF with ±0.5 LSB INL and ±1 LSB DNL over 0°C to +70°C, and features internal clock generation synchronized to external SCLK for deterministic timing control.
Shutdown mode reduces supply current to ≤2µA (VDD ≤ 3.6V), while wake-up delay depends on external REF bypass capacitance. The 3-wire serial interface operates in unipolar MSB-first format with EOC signaling via DOUT high transition, supporting direct connection to standard microcontroller I/O without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precision measurement of analog sensor signals. |
| Throughput Rate | 73ksps - enables real-time sampling of fast transients up to ~36.5kHz Nyquist bandwidth. |
| Conversion Time | 7.5µs - defines minimum inter-conversion interval; critical for high-speed burst-mode acquisition. |
| SINAD | 70dB at 10kHz - ensures ≥11.6 effective bits for accurate representation of dynamic signals. |
| Supply Current (Active) | 1.6mA typical at VDD = 3.6V - enables operation in ultra-low-power systems with <3mW active power. |
| Supply Current (Shutdown) | ≤2µA - reduces average system power by >99% during idle intervals between measurements. |
| Reference Input Range | 0V to VDD - allows use of rail-to-rail references up to +5.25V, simplifying supply-domain interfacing. |
| INL (Integral Nonlinearity) | ±1 LSB max - guarantees monotonicity and <0.024% full-scale error for calibrated instrumentation. |
Pinout & Package
MAX1241BEPA+ is housed in an 8-pin plastic DIP (PDIP) package with through-hole mounting and 0.3-inch body width. Pin spacing conforms to JEDEC MS-001 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; requires 0.1µF + 4.7µF bypassing for noise immunity. |
| AIN (Pin 2) | Analog input | Single-ended input with 0V to VREF range; 16pF input capacitance; source impedance ≤1kΩ recommended for full AC performance. |
| SHDN (Pin 3) | Three-level shutdown control | Pull low for ≤2µA shutdown; leave open or pull high for normal operation; controls internal reference enable only on MAX1240. |
| REF (Pin 4) | Reference voltage terminal | External reference input (0V to VDD); must drive ≤10Ω output impedance and supply up to 250µA during conversion. |
| GND (Pin 5) | Analog/digital common ground | Single-point star ground connection required; separates analog and digital return paths to minimize noise coupling. |
| DOUT (Pin 6) | Serial data output | 3-state CMOS output; high-impedance when CS = high; outputs MSB-first unipolar code with leading EOC bit. |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; must remain low until all 13 bits are clocked out; minimum pulse width = 240ns. |
| SCLK (Pin 8) | Serial clock input | Drives data readout; supports up to 2.1MHz; duty cycle unrestricted if each phase ≥200ns; must be low during conversion. |
Key Features
| Feature | Design Value |
|---|---|
| 3-wire serial interface | Fully compatible with SPI, QSPI, and MICROWIRE protocols-enables plug-and-play integration with industry-standard microcontrollers. |
| Internal track/hold | 1.5µs acquisition time eliminates need for external sample-and-hold circuitry, reducing BOM count and PCB area. |
| Low-power shutdown | Reduces supply current to ≤2µA, enabling multi-second sleep intervals in battery-powered loggers without compromising wake-up latency. |
| Wide supply range | +2.7V to +5.25V operation supports direct interface with 3.3V and 5V logic domains, avoiding level translators. |
| On-chip clock generator | Eliminates need for external timing components; synchronizes conversion timing to external SCLK for deterministic data capture. |
| Robust analog input protection | Clamps AIN to GND–0.3V / VDD+0.3V; allows safe overvoltage handling during system fault conditions. |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensors |
|---|---|
|
Use Scenario: Continuous voltage/current monitoring in remote environmental sensors powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary ADC digitizing thermistor, RTD, or pressure bridge outputs at 1–10ksps with minimal quiescent power. Use Value: 2µA shutdown current extends battery life to years; 73ksps headroom supports oversampling for noise reduction. |
Use Scenario: Signal conditioning in DIN-rail mounted field transmitters with galvanic isolation between sensor and host PLC. IC Role / Device Role / Timing Role: Isolated-side ADC converting 4–20mA loop-derived voltages before opto-coupled serial transmission. Use Value: Single-supply +2.7V–+5.25V operation matches isolated DC-DC output rails; 3-wire interface minimizes isolation channel count. |
| Portable Medical Instrumentation | Process Control Loop Monitoring |
|
Use Scenario: Analog front-end in handheld ECG or pulse oximeter units requiring compact size and low heat dissipation. IC Role / Device Role / Timing Role: High-fidelity digitization of amplified biopotential signals with 70dB SINAD and low THD. Use Value: 12-bit resolution and ±1 LSB INL ensure clinical-grade accuracy; PDIP package aids manual prototyping and rework. |
Use Scenario: Local analog input module in distributed control systems measuring temperature, flow, or level with 4–20mA inputs. IC Role / Device Role / Timing Role: Precision ADC capturing process variable signals for real-time PID feedback computation. Use Value: Reference input range up to VDD enables direct use of system 5V rail as reference, reducing component count and calibration drift. |
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-bit resolution, 200ksps, +2.7V to +5.25V, SPI-only interface, no shutdown mode | Limited to lower-accuracy industrial monitoring where 12-bit precision is unnecessary | Select when cost sensitivity outweighs resolution requirements and continuous operation is acceptable. |
| MAX11100EUA+ | 16-bit resolution, 100ksps, +2.7V to +3.6V, internal reference, 10-pin µMAX package | Higher precision needed in portable test equipment with tighter supply constraints | Choose when >12-bit ENOB is required and system can accommodate smaller footprint and narrower supply range. |
Compared with MAX1241BEPA+, ADS7822U trades resolution and power control for speed and cost, while MAX11100EUA+ increases resolution and integrates reference at the expense of supply flexibility and package compatibility-making MAX1241BEPA+ optimal for balanced 12-bit, low-power, wide-supply embedded sensing.
Availability
MAX1241BEPA+ is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensors, portable medical instrumentation, and process control loop monitoring requiring stable component supply across extended production lifecycles.
Supply support for MAX1241BEPA+ 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 and mixed-signal ICs for demanding industrial, medical, and communications applications, emphasizing low power, small size, and high reliability.
The MAX1240/MAX1241 family was engineered specifically for ultra-low-power, space-constrained data acquisition-delivering 12-bit accuracy with sub-3mW active power and 8-pin SO/PDIP packaging for rapid integration into portable and remote systems.
FAQ
What is the maximum clock frequency supported by the MAX1241BEPA+ serial interface?
The MAX1241BEPA+ supports an SCLK frequency up to 2.1MHz with 50% duty cycle, and each clock phase must be ≥200ns. This allows full 12-bit data readout in ≤6.2µs after conversion completion, enabling tight timing control in microcontroller-based systems without requiring specialized hardware peripherals.
Does the MAX1241BEPA+ include an internal voltage reference?
No, the MAX1241BEPA+ requires an external reference voltage applied to the REF pin. Unlike the MAX1240 variant, it has no internal reference. The device accepts reference voltages from 1.0V to VDD, and the REF input must drive ≤10Ω output impedance and supply up to 250µA during conversion to maintain specified accuracy.
What is the guaranteed integral nonlinearity (INL) specification for the MAX1241BEPA+?
The MAX1241BEPA+ has a guaranteed INL of ±1 LSB over its operating temperature range of 0°C to +70°C. This specification ensures monotonic operation and full-scale error of less than 0.024%, making it suitable for closed-loop control and calibrated measurement applications where code consistency is critical.
How does shutdown mode affect wake-up time in the MAX1241BEPA+?
In the MAX1241BEPA+, wake-up time after shutdown is ≤4µs because it relies on an external reference that remains active. This contrasts with the MAX1240, which requires recharging its internal 4.7µF REF bypass capacitor. The fast wake-up enables efficient duty-cycled operation in intermittent-sampling applications like wireless sensor nodes.
Can the MAX1241BEPA+ interface directly with SPI-compatible microcontrollers?
Yes, the MAX1241BEPA+ is fully compatible with SPI, QSPI, and MICROWIRE interfaces. It operates with CPOL = 0 and CPHA = 0, uses CS falling edge to initiate conversion, and outputs data MSB-first on DOUT with EOC signaled by rising edge-requiring no protocol translation or glue logic for direct connection to standard MCU SPI peripherals.
MAX1241BEPA+ 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1241BEPA+ FAQ
1.How can I place an order for MAX1241BEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1241BEPA+ 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 MAX1241BEPA+ reliable?
The price and inventory of MAX1241BEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1241BEPA+ is usually 5 days.
3.What payment methods are accepted for MAX1241BEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1241BEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1241BEPA+?
MAX1241BEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1241BEPA+ 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 MAX1241BEPA+?
For technical support, including MAX1241BEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1241BEPA+ requirements.
6.How does Aetrix verify that MAX1241BEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX1241BEPA+ 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 MAX1241BEPA+ meets industry standards.
7.What is the process for return or replacement of MAX1241BEPA+?
All MAX1241BEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1241BEPA+, 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 MAX1241BEPA+ part is unused and in its original packaging.
Return procedure for MAX1241BEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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