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Analog Devices Inc./Maxim Integrated MAX1241BESA+
- Part No.:
- MAX1241BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1241BESA+.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MAX1241BESA+ 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 MAX1241BESA+ datasheet, MAX1241BESA+ pinout, MAX1241BESA+ application, or MAX1241BESA+ equivalent, key selection considerations include its external-reference dependency, −40°C to +85°C industrial temperature range, 8-pin SO package, and shutdown current of ≤2µA - critical for portable instrumentation and isolated sensor interfaces.
Technical Context
The MAX1241BESA+ implements a capacitor-based 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 70dB SINAD at 10kHz, while internal timing control ensures deterministic 7.5µs conversion cycles independent of external clock during conversion.
Serial communication uses unipolar MSB-first format with end-of-conversion (EOC) signaled by DOUT high transition; data is clocked out on SCLK falling edges at up to 2.1MHz, compatible with standard microcontroller I/O without protocol-specific hardware support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise analog signal digitization in measurement-critical applications. |
| Throughput Rate | 73ksps - enables real-time sampling of fast transients up to ~36.5kHz Nyquist bandwidth in continuous mode. |
| INL (Integral Nonlinearity) | ±1 LSB - guarantees monotonicity and <0.024% full-scale error after calibration, essential for closed-loop control accuracy. |
| Supply Voltage Range | +2.7V to +5.25V - supports direct interfacing with 3.3V and 5V logic domains without level-shifting circuitry. |
| Power Consumption | 3mW at 73ksps (VDD = 3.6V) - enables >100-hour operation on coin-cell batteries in intermittent-sampling sensor nodes. |
| Reference Input | External only (0V to VREF) - requires stable, low-impedance reference (≤10Ω) capable of sourcing 250µA during conversion. |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including process control cabinets and outdoor telemetry units. |
Pinout & Package
MAX1241BESA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, 3.9mm × 4.9mm body size, 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog core, digital interface, and internal clock generator. |
| AIN (Pin 2) | Analog input | Single-ended input referenced to GND; 0V to VREF range with 16pF input capacitance and 9kΩ effective RIN. |
| SHDN (Pin 3) | Three-level shutdown control | Pulling low reduces supply current to ≤2µA; open or high enables operation; no internal reference activation (unlike MAX1240). |
| REF (Pin 4) | Reference voltage input | External reference connection point; must be bypassed with ≥0.1µF capacitor; supports rail-to-rail VREF up to VDD. |
| GND (Pin 5) | Analog/digital ground | Common return for analog signal path and digital interface; requires star-grounding separation from system DGND. |
| DOUT (Pin 6) | Serial data output | Three-state output; EOC signaled by rising edge; data valid on SCLK falling edge; MSB-first unipolar format. |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion and enables DOUT; high state places DOUT in high-impedance mode. |
| SCLK (Pin 8) | Serial clock input | Asynchronous clock up to 2.1MHz; duty cycle unrestricted if ≥200ns per phase; not required during conversion. |
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 dedicated ADC controller hardware. |
| Internal track/hold | 1.5µs acquisition time with no external hold capacitor required; supports source impedances ≤1kΩ without performance degradation. |
| Low-power shutdown mode | ≤2µA supply current in shutdown; wake-up delay ≤4µs (MAX1241); enables duty-cycled operation in energy-harvesting sensor nodes. |
| On-chip clock generator | Eliminates need for external timing components; ensures consistent 7.5µs conversion time across voltage and temperature. |
| Robust analog input protection | Clamping diodes allow −0.3V to VDD+0.3V survival range; accurate conversion guaranteed only within GND−50mV to VDD+50mV. |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensors |
|---|---|
Use Scenario: Continuous voltage/current monitoring in remote environmental sensors powered by Li-SOCl₂ cells. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from precision op-amp stages before SPI transmission to ultra-low-power MCU. Use Value: 3mW active power and 2µA shutdown current extend battery life beyond 5 years at 1-sample-per-minute duty cycle. |
Use Scenario: Signal conditioning in DIN-rail mounted current transducers with galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side ADC converting shunt-voltage signals into digital data for optocoupler or digital isolator transmission. Use Value: External reference support allows synchronization to system-wide precision reference, ensuring ±0.1% total measurement uncertainty. |
| Portable Medical Instrumentation | Process Control Loop Interfaces |
Use Scenario: Analog front-end in handheld blood glucose meters requiring clinical-grade accuracy and CE-compliant low power. IC Role / Device Role / Timing Role: High-fidelity digitizer for amperometric biosensor current outputs, interfaced directly to ARM Cortex-M0+ via GPIO bit-banged SPI. Use Value: ±1 LSB INL and 70dB SINAD meet ISO 15197:2013 accuracy requirements for diagnostic-grade readings. |
Use Scenario: Field transmitter modules converting 4–20mA loop signals to digital values for PLC analog input cards. IC Role / Device Role / Timing Role: Local ADC providing local diagnostics and high-resolution digitization prior to HART or RS-485 communication. Use Value: −40°C to +85°C rating and rail-to-rail reference input enable reliable operation in unheated industrial enclosures. |
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; 12-bit; 200ksps; SPI interface; internal reference optional; 8-pin SOIC | Higher speed but higher power (1.2mW @ 200ksps); includes internal reference option not available in MAX1241BESA+ | Select when higher throughput is needed and reference flexibility is required; verify layout compatibility with faster timing margins. |
| AD7476ARZ | 2.35V–5.25V supply; 12-bit; 1MSPS; SPI interface; no internal reference; 8-pin SOIC | 10× faster sampling but 5× higher power (12mW @ 1MSPS); identical external-reference dependency and pinout-compatible | Choose for high-speed control loops where latency matters more than battery life; confirm PCB thermal design handles increased dissipation. |
Compared with ADS7822U and AD7476ARZ, the MAX1241BESA+ offers optimal balance of ultra-low power (3mW), industrial temperature range, and proven reliability in long-life embedded data loggers - making it preferred for applications prioritizing energy efficiency over raw speed.
Availability
MAX1241BESA+ 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 across extended product lifecycles.
Supply support for MAX1241BESA+ 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 space- and power-constrained remote sensing, delivering 12-bit accuracy with minimal external components and robust serial interoperability.
FAQ
What is the reference voltage requirement for MAX1241BESA+?
The MAX1241BESA+ requires an external reference voltage applied to the REF pin, ranging from +1.0V to VDD. It does not include an internal reference. For optimal performance, the reference must have ≤10Ω output impedance and be bypassed with ≥0.1µF ceramic capacitor near the REF pin. The MAX1241BESA+ supports rail-to-rail reference voltages, enabling full utilization of the 0V to VREF input range.
Does MAX1241BESA+ support SPI mode 0 (CPOL=0, CPHA=0)?
Yes, MAX1241BESA+ is fully compatible with SPI mode 0 (CPOL=0, CPHA=0). Conversion begins on the CS falling edge, DOUT goes low to indicate conversion-in-progress, and data is clocked out on SCLK falling edges starting with the MSB. The device outputs a leading '1' bit followed by 12 data bits, requiring at least 13 clock cycles for complete readout.
What is the maximum allowed source impedance for the AIN pin on MAX1241BESA+?
The MAX1241BESA+ specifies a 9kΩ effective input resistance (RIN) and 16pF input capacitance at AIN. For ≤1kΩ source impedance, acquisition time remains at the specified 1.5µs. Higher impedances increase tACQ per tACQ = 9(RS + RIN) × 16pF; sources >1kΩ require additional acquisition time or local 0.01µF decoupling to maintain AC performance.
Can MAX1241BESA+ operate with a 5V supply?
Yes, MAX1241BESA+ supports VDD from +2.7V to +5.25V, making it compatible with standard 5V systems. At VDD = 5.25V, typical supply current is 2.8mA at 73ksps, and all digital I/O (SCLK, CS, SHDN, DOUT) tolerate 0V to VDD logic levels. Reference voltage (VREF) may also extend up to VDD, enabling full-scale input ranges up to 5.25V.
How does shutdown mode function on MAX1241BESA+?
Driving SHDN low places MAX1241BESA+ into shutdown, reducing supply current to ≤2µA. Unlike the MAX1240, SHDN has no reference-control function on the MAX1241BESA+ - the internal reference is absent. Wake-up time is ≤4µs after SHDN is deasserted, allowing rapid resumption of conversions in burst-mode sensing applications.
MAX1241BESA+ 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
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1241BESA+ FAQ
1.How can I place an order for MAX1241BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1241BESA+ 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 MAX1241BESA+ reliable?
The price and inventory of MAX1241BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1241BESA+ is usually 5 days.
3.What payment methods are accepted for MAX1241BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1241BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1241BESA+?
MAX1241BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1241BESA+ 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 MAX1241BESA+?
For technical support, including MAX1241BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1241BESA+ requirements.
6.How does Aetrix verify that MAX1241BESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1241BESA+ 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 MAX1241BESA+ meets industry standards.
7.What is the process for return or replacement of MAX1241BESA+?
All MAX1241BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1241BESA+, 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 MAX1241BESA+ part is unused and in its original packaging.
Return procedure for MAX1241BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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