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Analog Devices Inc./Maxim Integrated MAX1241CESA+
- Part No.:
- MAX1241CESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1241CESA+.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,512
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Product details
Overview
MAX1241CESA+ from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (SAR ADC) operating from +2.7V to +5.25V supply, featuring 73ksps throughput, 1.5µs track/hold acquisition time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It requires an external reference voltage (0V to VREF input range), supports shutdown mode (≤2µA), and is packaged in an 8-pin SOIC for space-constrained battery-powered data acquisition.
For engineers reviewing the MAX1241CESA+ datasheet, MAX1241CESA+ pinout, MAX1241CESA+ application, or MAX1241CESA+ equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed timing behavior at 2.1MHz SCLK, real-world power consumption profiles across temperature and sampling rates, and precise substitution guidance grounded in manufacturer-specified compatibility.
Technical Context
The MAX1241CESA+ implements a fully integrated SAR architecture with internal track/hold and on-chip clock, eliminating need for external hold capacitors. Its analog front-end accepts 0V to VREF inputs with ±0.5 LSB INL and ±1 LSB DNL over 0°C to +70°C, and features aperture jitter <50ps and 2.25MHz small-signal bandwidth.
Control logic responds to active-low CS falling edge to initiate conversion, outputs unipolar 12-bit MSB-first serial data via DOUT synchronized to SCLK falling edges, and supports three-level SHDN control-low for shutdown (<2µA), high/unconnected for normal operation-with no internal reference (unlike MAX1240).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Throughput Rate | 73ksps maximum - enables real-time sampling of signals up to ~36.5kHz Nyquist bandwidth without undersampling constraints. |
| Supply Voltage Range | +2.7V to +5.25V - supports direct interfacing with 3.3V and 5V microcontrollers without level-shifting. |
| Reference Input | External VREF (0V to VDD) - requires external reference source; REF pin accepts 1.0V–VDD with ≤10Ω output impedance for full accuracy. |
| Power Consumption | 3mW at 73ksps (VDD = 3.6V) - enables >100-hour operation on a single CR2032 coin cell in intermittent-sampling systems. |
| Shutdown Current | ≤2µA - reduces average system power by >99% between conversions, critical for ultra-low-duty-cycle sensor nodes. |
| INL / DNL | ±0.5 LSB / ±1 LSB - ensures <0.012% full-scale linearity error, suitable for precision instrumentation calibration. |
Pinout & Package
MAX1241CESA+ is housed in an 8-pin SOIC (SO) package with standard 150-mil width and 1.27mm pitch, RoHS-compliant and lead-free (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | Accepts +2.7V to +5.25V; bypass with 0.1µF ceramic + 4.7µF tantalum to GND for stable reference coupling. |
| AIN (Pin 2) | Analog input | Single-ended input with 0V to VREF range; protected to GND −0.3V / VDD +0.3V; source impedance ≤1kΩ recommended. |
| SHDN (Pin 3) | Three-level shutdown control | Pull low for <2µA shutdown; leave open or pull high for active mode; no internal reference activation (MAX1241-specific). |
| REF (Pin 4) | Reference voltage terminal | External reference input (1.0V 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; separate analog and digital return paths mandatory for <70dB SINAD. |
| SCLK (Pin 6) | Serial clock input | Accepts 0–2.1MHz clock; minimum 200ns pulse width; duty cycle unrestricted if both phases ≥200ns. |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; must remain low until all 13 serial bits (1 EOC + 12 data) are clocked out. |
| DOUT (Pin 8) | Serial data output | Three-state output; transitions on SCLK falling edge; high-impedance when CS = high; MSB-first unipolar format. |
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 parallel bus routing. |
| Internal track/hold | 1.5µs acquisition time with no external capacitor required; supports accurate sampling of fast transients up to 2.25MHz bandwidth. |
| Low-voltage operation | Functional down to +2.7V supply - enables direct integration into 3V-only systems without regulator overhead. |
| Ultra-low shutdown current | ≤2µA max - allows use in energy-harvesting or battery-backed applications where quiescent power dominates lifetime budget. |
| Small footprint | 8-pin SOIC (5.0mm × 4.0mm) - fits within tight PCB real estate constraints typical of portable medical and industrial sensors. |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensors |
|---|---|
Use Scenario: Continuous voltage monitoring of lithium-ion cell stacks in remote environmental stations powered by solar-charged batteries. IC Role / Device Role / Timing Role: Primary SAR ADC digitizing 0–2.5V analog outputs from isolated voltage dividers; triggered by µC every 10s via CS. Use Value: 3mW active power and 2µA shutdown enable >5-year battery life; 73ksps headroom supports burst-mode diagnostics without firmware change. |
Use Scenario: Analog signal conditioning in DIN-rail-mounted PLC I/O modules with galvanic isolation between field-side sensors and controller bus. IC Role / Device Role / Timing Role: Isolated-side ADC converting 4–20mA loop-derived voltages; synchronized to host µC via optocoupled SCLK/CS lines. Use Value: External reference support allows matching to isolated reference ICs (e.g., REF200); 2.25MHz input bandwidth preserves step response of fast pressure transducers. |
| Portable Medical Instrumentation | Process Control Transmitters |
Use Scenario: ECG front-end in handheld patient monitors requiring low-noise, low-power signal digitization near human body. IC Role / Device Role / Timing Role: Final-stage ADC after programmable-gain amplifier; sampled at 1ksps with automatic shutdown between beats. Use Value: 66µW at 1ksps minimizes self-heating in sealed enclosures; ±0.5 LSB INL ensures clinical-grade amplitude accuracy per IEC 60601-2-27. |
Use Scenario: Smart 4–20mA HART-enabled transmitter measuring temperature via RTD bridge, transmitting digitized values over two-wire loop. IC Role / Device Role / Timing Role: High-accuracy ADC referenced to loop-powered 2.5V shunt; conversion initiated by HART modem interrupt. Use Value: 1.0V–VDD reference range accommodates 2.5V reference derived from loop current; ±1 LSB DNL prevents nonlinearity-induced calibration drift over 15-year field life. |
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, SPI interface, but uses internal reference only; no external REF pin. | Requires reference redesign if existing system relies on shared external reference rail. | Select only if reference architecture permits internal reference use and layout cannot accommodate REF bypass cap. |
| AD7476ARMZ | 2.35V–5.25V supply, 12-bit, SPI, 1MSPS max rate; no SHDN pin - shutdown controlled via CS timing. | Lacks dedicated shutdown pin, increasing µC GPIO count and software complexity for ultra-low-power sleep modes. | Prefer when higher speed (>73ksps) is needed and system can tolerate software-managed power gating. |
Compared with MAX1241CESA+, ADS7822U sacrifices external reference flexibility for simpler BOM, while AD7476ARMZ trades pin-defined shutdown for raw speed - making MAX1241CESA+ optimal for systems prioritizing deterministic low-power control and reference sharing.
Availability
MAX1241CESA+ is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensors, portable medical instrumentation, and process control transmitters requiring stable component supply across extended production lifecycles.
Supply support for MAX1241CESA+ 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, with emphasis on low-power, high-integration solutions.
The MAX1240/MAX1241 product line targets portable and remote measurement systems requiring 12-bit accuracy, sub-10µs conversion, and minimal board area - specifically optimized for single-supply, low-quiescent-current sensor interfaces.
FAQ
What is the reference voltage requirement for MAX1241CESA+?
MAX1241CESA+ requires an external reference voltage applied to the REF pin, ranging from 1.0V to VDD (up to +5.25V). The reference must have ≤10Ω output impedance and supply up to 250µA during conversion. Unlike the MAX1240, it has no internal reference; therefore, MAX1241CESA+ cannot operate without an externally supplied VREF.
Does MAX1241CESA+ support SPI mode with CPOL=0 and CPHA=0?
Yes, MAX1241CESA+ is explicitly compatible with SPI, QSPI, and MICROWIRE protocols using CPOL=0 and CPHA=0. In this configuration, CS falling edge starts conversion, DOUT goes low during conversion, and data is clocked out MSB-first on SCLK falling edges - exactly matching standard SPI master timing requirements.
What is the maximum sampling rate and corresponding power consumption of MAX1241CESA+?
MAX1241CESA+ achieves a maximum throughput rate of 73ksps with 3mW power consumption at VDD = 3.6V. At lower rates - e.g., 1ksps - power drops to 66µW. These values are measured under specified conditions (fSCLK = 2.1MHz, TA = +25°C) and scale predictably with supply voltage and temperature per the datasheet's operating current curves.
How does the SHDN pin function on MAX1241CESA+?
On MAX1241CESA+, the SHDN pin operates in three states: pulled low → shutdown mode (<2µA supply current); left open or pulled high → normal operation. Unlike the MAX1240, SHDN high does not enable an internal reference - MAX1241CESA+ always requires external VREF regardless of SHDN state.
Can MAX1241CESA+ be used with a 5V microcontroller without level shifting?
Yes, MAX1241CESA+ supports VDD up to +5.25V and all digital pins (SCLK, CS, DOUT, SHDN) are 5V-tolerant when VDD = 5V. With VDD = 5V, logic thresholds scale accordingly (VIH ≈ 3.0V, VIL ≈ 0.8V), enabling direct connection to standard 5V µC I/O ports without level-shifting circuitry.
MAX1241CESA+ 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:
- -
MAX1241CESA+ FAQ
1.How can I place an order for MAX1241CESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1241CESA+ 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 MAX1241CESA+ reliable?
The price and inventory of MAX1241CESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1241CESA+ is usually 5 days.
3.What payment methods are accepted for MAX1241CESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1241CESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1241CESA+?
MAX1241CESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1241CESA+ 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 MAX1241CESA+?
For technical support, including MAX1241CESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1241CESA+ requirements.
6.How does Aetrix verify that MAX1241CESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1241CESA+ 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 MAX1241CESA+ meets industry standards.
7.What is the process for return or replacement of MAX1241CESA+?
All MAX1241CESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1241CESA+, 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 MAX1241CESA+ part is unused and in its original packaging.
Return procedure for MAX1241CESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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