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Analog Devices Inc./Maxim Integrated MAX1241BESA+T
- Part No.:
- MAX1241BESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1241BESA+T.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,853
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Product details
Overview
MAX1241BESA+T 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, internal track/hold with 1.5µs acquisition, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. Designed for battery-powered sensor nodes, it delivers 73ksps throughput at 3mW (VDD = 3.6V) and supports external reference input up to VDD.
For engineers reviewing the MAX1241BESA+T datasheet, MAX1241BESA+T pinout, MAX1241BESA+T application, or MAX1241BESA+T equivalent, this page provides verified technical context, real-world design meanings of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX1241BESA+T implements a capacitive SAR architecture with integrated track/hold, requiring no external hold capacitor. Its analog front-end accepts 0V to VREF inputs, where VREF is externally supplied and must be stable within ±10mV during conversion to maintain ±1 LSB INL.
Serial communication uses unipolar MSB-first format with a leading end-of-conversion (EOC) bit, clocked by an external SCLK up to 2.1MHz. The SHDN pin enables full shutdown (≤2µA), and its state also controls internal reference enable/disable - though MAX1241 variants require external reference regardless of SHDN state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes over full-scale range, enabling sub-millivolt voltage resolution with 2.5V reference (1 LSB = 610µV) |
| Conversion Time | 7.5 µs - defines minimum inter-conversion interval; supports maximum 73ksps sampling without pipeline overlap |
| Supply Voltage Range | +2.7V to +5.25V - allows direct interfacing with 3.3V and 5V microcontrollers without level-shifting |
| Power Consumption | 3 mW at 73ksps (VDD = 3.6V) - enables >100-hour operation on a 200mAh coin cell at 1ksps with periodic wake-up |
| INL | ±1 LSB - guarantees monotonicity and ≤0.024% full-scale error after calibration, critical for closed-loop control accuracy |
| Reference Input Range | 1.0V to VDD - permits use of precision references (e.g., REF5025) or ratiometric sensing with supply-derived references |
| SPI Clock Frequency | Up to 2.1 MHz - supports data readout in ≤6.2 µs (13 cycles), minimizing µC active time per sample |
Pinout & Package
MAX1241BESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+T suffix), with standard JEDEC MS-012AC footprint (5.0mm × 4.0mm, 1.27mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | Accepts +2.7V to +5.25V; powers analog core, digital logic, and internal track/hold; bypass with 0.1µF + 4.7µF near pin |
| AIN (Pin 2) | Analog input | Single-ended input referenced to GND; 0V to VREF range; protected to GND−0.3V / VDD+0.3V; source impedance ≤1kΩ for full AC performance |
| SHDN (Pin 3) | Three-level shutdown control | Pull low for ≤2µA shutdown; high or open for active mode; does not enable internal reference (MAX1241 has no internal reference) |
| REF (Pin 4) | External reference input | Accepts 1.0V to VDD; requires ≤10Ω source impedance and ≥250µA DC drive capability; bypass with ≥0.1µF ceramic |
| GND (Pin 5) | Analog/digital common ground | Single-point star ground connection required; separates analog return path from digital noise sources |
| CS (Pin 6) | Active-low chip select | Falling edge initiates conversion; must remain low until all 13 bits (EOC + 12 data) are clocked out; high-Z DOUT when CS = high |
| DOUT (Pin 7) | Serial data output | MSB-first unipolar format; EOC bit (high) precedes 12-bit result; transitions on SCLK falling edge; 3-state controlled by CS |
| SCLK (Pin 8) | Serial clock input | Externally generated clock up to 2.1MHz; duty cycle unrestricted if high/low ≥200ns; must be low during conversion initiation |
Key Features
| Feature | Design Value |
|---|---|
| 3-wire SPI/QSPI/MICROWIRE interface | Eliminates need for dedicated ADC controller; connects directly to standard µC GPIOs with no protocol translation logic |
| Internal track/hold with 1.5µs acquisition | Removes external hold capacitor and driver op-amp, reducing BOM count and board area in space-constrained designs |
| 2µA shutdown current | Enables ultra-low average power in duty-cycled systems (e.g., 1ksps → ~66µW avg), extending battery life without complex power sequencing |
| 73ksps throughput at 3mW | Delivers high-speed data capture for transient monitoring (e.g., vibration, acoustic events) while maintaining <10mW system power budget |
| ±1 LSB integral nonlinearity | Ensures accurate end-point calibration and eliminates code-width variation across temperature (–40°C to +85°C) |
Applications
| Battery-Powered Data Logger | Isolated Industrial Sensor Node |
|---|---|
Use Scenario: Continuous voltage/current measurement from thermocouples or strain gauges in remote field deployments powered by Li-SOCl₂ cells. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog signals; performs synchronized sampling triggered by µC; EOC signal used for deterministic interrupt-driven readout. Use Value: 3mW active power and 2µA shutdown enable multi-year operation; 12-bit resolution supports 0.1°C thermal resolution with Type-K thermocouple and cold-junction compensation. |
Use Scenario: Analog input module in DIN-rail PLC I/O subsystem, galvanically isolated via ADuM series digital isolators. IC Role / Device Role / Timing Role: Isolated-side ADC converting sensor outputs; interfaces to isolated SPI bus; timing governed by isolated SCLK and CS edges to prevent metastability. Use Value: External reference support allows ratiometric operation with isolated reference IC (e.g., ADM706), eliminating drift errors from isolation barrier voltage drop. |
| Portable Medical Instrumentation | Process Control Loop Monitor |
Use Scenario: Handheld blood glucose meter or pulse oximeter requiring compact, low-noise analog front-end and long battery life. IC Role / Device Role / Timing Role: Signal digitizer for photodiode transimpedance amplifier output; operates in burst mode synchronized to LED drive pulses. Use Value: 1.5µs track/hold acquisition captures fast optical pulses without droop; 7.5µs conversion ensures complete readout before next LED activation cycle. |
Use Scenario: 4–20mA loop-powered transmitter monitoring tank level or pressure using HART-compatible smart sensors. IC Role / Device Role / Timing Role: High-accuracy ADC for digitizing loop current-derived voltage; shares VDD with loop regulator; reference derived from precision shunt. Use Value: 1.0V to VDD reference range allows direct use of 2.5V shunt reference, avoiding extra LDO and improving loop power efficiency by >5%. |
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 SAR; 200ksps; SPI interface; internal reference only (2.5V); no external REF pin | Requires internal reference usage; unsuitable where ratiometric or custom reference voltage is needed | Select when fixed 2.5V reference suffices and higher speed justifies larger package (SO-8 vs. SO-8 same footprint but different pinout) |
| AD7476ARMZ | 2.35V–5.25V supply; 12-bit SAR; 1MSPS; SPI interface; external reference only; 6-lead SOT-23 package | Higher speed and smaller size, but lacks SHDN pin and track/hold - requires external sample-hold or limits source impedance to <100Ω | Select for space-constrained, high-throughput applications where external T/H is acceptable and shutdown is managed externally |
Compared with ADS7822U and AD7476ARMZ, MAX1241BESA+T uniquely combines external reference flexibility, integrated track/hold for high-impedance sources, and hardware shutdown - making it optimal for battery-operated, sensor-front-end designs demanding both precision and ultra-low quiescent power.
Availability
MAX1241BESA+T is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensor nodes, portable medical instrumentation, and process control loop monitors requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MAX1241BESA+T 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, automotive, and communications markets.
MAX1241BESA+T belongs to the MAX1240/MAX1241 family of low-power, 12-bit serial ADCs designed specifically for space- and energy-constrained remote sensing and portable instrumentation applications.
FAQ
What is the reference voltage requirement for MAX1241BESA+T?
MAX1241BESA+T 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 provide ≥250µA DC load current with ≤10Ω output impedance and be bypassed with ≥0.1µF ceramic capacitance placed close to the REF pin. The MAX1241BESA+T specification assumes VREF = 2.500V for AC and DC parameter testing.
Does MAX1241BESA+T support SPI mode CPOL=0, CPHA=0?
Yes, MAX1241BESA+T fully supports SPI mode 0 (CPOL = 0, CPHA = 0). In this configuration, CS falling edge initiates conversion, DOUT goes low during conversion, and data is sampled on SCLK rising edge after being driven on the falling edge. The device outputs a leading EOC bit followed by 12 MSB-first data bits, requiring 13 clock cycles for complete readout - matching standard SPI frame timing.
What is the maximum source impedance allowed at AIN for full AC performance with MAX1241BESA+T?
For full AC performance (including SINAD ≥70dB and THD ≤–80dB), the analog input source impedance at AIN must be ≤1kΩ. Higher impedances increase acquisition time and degrade dynamic performance. If source impedance exceeds 1kΩ, a 0.01µF capacitor should be placed at AIN to form an RC filter, though this reduces effective input bandwidth and requires careful anti-aliasing design.
How does the SHDN pin function on MAX1241BESA+T?
On MAX1241BESA+T, the SHDN pin operates as a three-level control: pulled low (≤0.4V) places the device in shutdown with ≤2µA supply current; pulled high (≥VDD–0.4V) or left open enables normal operation. Unlike the MAX1240, SHDN state does not affect reference selection - MAX1241BESA+T always requires an external reference regardless of SHDN voltage.
Can MAX1241BESA+T operate with a 5V supply and 2.5V reference simultaneously?
Yes, MAX1241BESA+T supports VDD = 5V and VREF = 2.5V simultaneously. Its REF input range extends from 1.0V to VDD, and its absolute maximum ratings allow REF to GND stress up to VDD + 0.3V. This configuration enables ratiometric measurements where the 2.5V reference is derived independently (e.g., from a precision bandgap), while the 5V supply powers digital interfaces and external circuitry - a common setup in industrial I/O modules.
MAX1241BESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1241BESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1241BESA+T 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+T reliable?
The price and inventory of MAX1241BESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1241BESA+T is usually 5 days.
3.What payment methods are accepted for MAX1241BESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1241BESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1241BESA+T?
MAX1241BESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1241BESA+T 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+T?
For technical support, including MAX1241BESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1241BESA+T requirements.
6.How does Aetrix verify that MAX1241BESA+T is sourced from the original manufacturer or authorized distributors?
All MAX1241BESA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX1241BESA+T?
All MAX1241BESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1241BESA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX1241BESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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