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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:3,854
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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, this page delivers verified electrical specs, package mapping, functional pin roles, real-world use cases, and validated alternative parts - all grounded in the official MAX1240/MAX1241 datasheet Rev 5 (8/2010).
Technical Context
The MAX1241BESA 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 ±1 LSB INL and ±1 LSB DNL over –40°C to +85°C, and features internal clock generation synchronized to external SCLK up to 2.1MHz.
Control logic responds to active-low CS falling edge to initiate conversion; DOUT transitions high upon completion (EOC signal) and shifts out unipolar 12-bit data MSB-first on SCLK falling edges. Shutdown mode reduces supply current to ≤2µA via SHDN pin, with wake-up delay dependent on external REF bypass capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete digital codes across full-scale range |
| Throughput Rate | 73ksps - enables real-time sampling of signals up to ~36.5kHz Nyquist bandwidth |
| Conversion Time | 7.5µs - fixed latency from CS fall to EOC assertion, independent of clock rate |
| Supply Voltage Range | +2.7V to +5.25V - supports single-supply operation across 3.3V and 5V systems |
| INL / DNL | ±1 LSB max - ensures monotonicity and <0.024% full-scale linearity error |
| Power Consumption | 3mW at 73ksps (VDD = 3.6V) - enables >100-hour runtime on coin-cell batteries |
| Reference Input | External only - accepts 1.0V to VDD reference, requiring ≤10Ω source impedance |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire - uses SCLK, CS, DOUT with no MISO/MOSI complexity |
Pinout & Package
MAX1241BESA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | Accepts +2.7V to +5.25V; powers analog/digital sections and internal clock |
| AIN (Pin 2) | Analog input | Single-ended input referenced to GND; 0V to VREF range, protected to ±0.3V beyond rails |
| SHDN (Pin 3) | Three-level shutdown control | Pull low for ≤2µA shutdown; open or high for normal operation (no internal reference activation) |
| REF (Pin 4) | Reference voltage input | External reference connection point; requires ≥0.1µF bypass capacitor for stability |
| GND (Pin 5) | Analog/digital ground | Common return for analog input, reference, and digital I/O; must be star-grounded per layout guidelines |
| SCLK (Pin 6) | Serial clock input | Asynchronous master clock up to 2.1MHz; duty cycle unrestricted if ≥200ns per phase |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance tri-state |
| DOUT (Pin 8) | Serial data output | Unipolar 12-bit result shifted MSB-first on SCLK falling edge; EOC signaled by rising edge |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply wide-voltage operation | +2.7V to +5.25V support simplifies power design in mixed-voltage embedded systems |
| Integrated track/hold with 1.5µs acquisition | Eliminates external hold capacitor and associated board area, reducing BOM count |
| 3-wire serial interface compatibility | Direct connection to standard microcontroller SPI peripherals without level-shifting or glue logic |
| Low-power shutdown mode | ≤2µA quiescent current enables energy harvesting and ultra-low-duty-cycle sensing |
| Industrial temperature grade | –40°C to +85°C operation certified for deployment in harsh environmental conditions |
| No missing codes over temperature | Guaranteed monotonicity ensures reliable measurement integrity across full operating range |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensors |
|---|---|
Use Scenario: Continuous voltage/current monitoring in remote field nodes powered by Li-SOCl₂ cells. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs at 1–10ksps, controlled via microcontroller SPI. Use Value: 3mW active power and 2µA shutdown enable multi-year operation; 8-pin SO footprint minimizes PCB area in compact enclosures. |
Use Scenario: Analog signal conditioning in DIN-rail-mounted process transmitters with galvanic isolation. IC Role / Device Role / Timing Role: High-accuracy front-end ADC interfacing isolated amplifiers, synchronized to isolated µC via optocoupled SCLK/CS. Use Value: ±1 LSB INL ensures <0.025% measurement fidelity; external reference flexibility allows matching to precision isolated reference ICs. |
| Portable Medical Instrumentation | Smart Building Environmental Monitors |
Use Scenario: Vital sign acquisition (ECG, SpO₂) in handheld diagnostic tools with strict size and thermal constraints. IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing biopotential waveforms at 125–1000Hz with minimal self-heating. Use Value: 2.25MHz small-signal bandwidth supports clean acquisition of fast transients; 7.5µs conversion time enables tight timing control in µC-driven sequences. |
Use Scenario: Multi-sensor HVAC node measuring temperature, humidity, CO₂, and occupancy via resistive/capacitive sensors. IC Role / Device Role / Timing Role: Shared ADC resource multiplexed across multiple sensor channels using external analog switches. Use Value: 1.5µs track/hold acquisition enables accurate sampling even with high-source-impedance sensors; 8-pin SO eases routing in dense multi-layer boards. |
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-only interface, no SHDN pin | Lacks hardware shutdown; higher speed but higher power (1.2mW @ 200ksps) | Select when maximum throughput >100ksps is required and shutdown control is handled externally |
| AD7476AARMZ | 2.35V–5.25V supply, 12-bit, 1MSPS, SPI interface, 350nA shutdown | Higher speed and lower shutdown current, but requires external reference and has larger 10-pin MSOP package | Select when sub-microamp shutdown and >500ksps sampling are critical, and board space permits 10-pin layout |
Compared with MAX1241BESA, ADS7822U offers higher speed but no integrated shutdown control, while AD7476AARMZ provides superior shutdown efficiency and sampling rate at the cost of larger footprint and no native QSPI/MICROWIRE compatibility.
Availability
MAX1241BESA is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensors, portable medical instrumentation, and smart building environmental monitors requiring stable component supply across extended production 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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX1240/MAX1241 product line delivers ultra-low-power, small-footprint 12-bit ADCs optimized for remote, space-constrained, and energy-sensitive measurement systems.
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 accuracy, the external reference must provide ≤10Ω output impedance and support up to 250µA DC load during conversion. A minimum 0.1µF bypass capacitor is mandatory at the REF pin.
Does MAX1241BESA support QSPI interface timing?
Yes, MAX1241BESA is explicitly compatible with QSPI timing: it accepts CPOL = 0 and CPHA = 0 configuration, requires 13 SCLK falling edges to shift out the full 12-bit result (plus leading EOC bit), and operates up to 2.097MHz for guaranteed QSPI compliance. No additional framing or dummy cycles are needed.
What is the maximum source impedance allowed at AIN for accurate acquisition?
For guaranteed 1.5µs acquisition time and full AC performance, the AIN source impedance must be ≤1kΩ. Higher impedances increase acquisition time per tACQ = 9(RS + 9kΩ) × 16pF. If RS exceeds 1kΩ, a 0.01µF capacitor should be placed directly at AIN to maintain bandwidth and reduce settling error.
How does the SHDN pin function on MAX1241BESA?
On MAX1241BESA, the SHDN pin operates as a three-level control: pulled low → shutdown mode (≤2µA supply current); left open or pulled high → normal operation. Unlike the MAX1240, SHDN high does not activate an internal reference - MAX1241BESA always uses external reference regardless of SHDN state.
What package type and temperature grade is MAX1241BESA?
MAX1241BESA is supplied in an 8-pin SO (Small Outline) package and is rated for the industrial temperature range of –40°C to +85°C. The "B" grade denotes ±1 LSB INL and ±1 LSB DNL performance; the "E" suffix confirms the extended temperature qualification.
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:
- 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
- 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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