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Analog Devices Inc./Maxim Integrated MAX1241BCSA
- Part No.:
- MAX1241BCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1241BCSA.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,329
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Product details
Overview
The MAX1241BCSA from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (ADC) operating from +2.7V to +5.25V, featuring a 7.5µs conversion time, internal track/hold, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It requires an external reference voltage (0V to VREF input range), supports up to 73ksps sampling, and draws only 1.9mA typical supply current at 3.6V - ideal for battery-powered data loggers and isolated sensor interfaces.
For engineers reviewing the MAX1241BCSA datasheet, MAX1241BCSA pinout, MAX1241BCSA application, or MAX1241BCSA equivalent, this page delivers verified electrical specs, validated SO-8 package mapping, confirmed timing behavior (tACQ = 1.5µs, tCONV = 7.5µs), real-world interface compatibility (SPI Mode 0, CPOL=0/CPHA=0), and two rigorously cross-checked alternative ADCs with documented functional trade-offs.
Technical Context
The MAX1241BCSA 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 (up to VDD), with input protection diodes clamping to GND −0.3V and VDD +0.3V.
Conversion is initiated by CS falling edge; DOUT transitions high to signal end-of-conversion (EOC), then outputs 13-bit serial stream (1 leading EOC bit + 12 data bits MSB-first) synchronized to SCLK falling edges. Internal clock enables autonomous conversion, while external SCLK controls readout at up to 2.1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit unipolar output - delivers 4096 discrete codes over full-scale range |
| Throughput Rate | 73ksps maximum - supports real-time monitoring of fast transients in portable instrumentation |
| Conversion Time | 7.5µs - defines minimum inter-conversion interval for high-speed sampling sequences |
| Track/Hold Acquisition | 1.5µs minimum - sets shortest allowable signal settling time before CS assertion |
| Supply Voltage Range | +2.7V to +5.25V - enables direct interfacing with 3.3V and 5V microcontrollers without level-shifting |
| Reference Input | External VREF (0V to VDD) - allows flexible scaling (e.g., 2.5V, 3.0V, 5.0V) and precision system-level referencing |
| INL (Integral Nonlinearity) | ±1 LSB max - ensures monotonicity and <0.025% full-scale error across temperature (0°C to +70°C) |
Pinout & Package
MAX1241BCSA is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead-free (+ suffix). Pin spacing is 1.27mm, body width 3.9mm, and total footprint 4.9mm × 6.0mm - compatible with standard SO-8 PCB layouts and automated assembly.
| 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 |
| AIN (Pin 2) | Analog input | Single-ended input referenced to GND; 0V to VREF range, protected ±0.3V beyond rails |
| SHDN (Pin 3) | Three-level shutdown control | Pulled low → 15µA shutdown; open/high → active mode; open disables internal reference (not used on MAX1241) |
| REF (Pin 4) | Reference voltage terminal | External reference input (0V to VDD); bypass with ≥0.1µF ceramic capacitor for stability |
| GND (Pin 5) | Analog/digital common ground | Single-point star ground connection required to minimize noise coupling into SAR core |
| SCLK (Pin 6) | Serial clock input | Asynchronous external clock up to 2.1MHz; controls DOUT data shift timing, not conversion timing |
| 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 | MSB-first unipolar stream: 1 EOC bit + 12 data bits; transitions on SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| 3-wire serial interface | Fully compatible with SPI Mode 0 (CPOL=0, CPHA=0), QSPI, and MICROWIRE - eliminates need for dedicated ADC controller logic |
| Internal track/hold | Acquires signal in 1.5µs without external capacitor - simplifies analog front-end design and reduces board area |
| Low power at speed | 1.9mA @ 3.6V/73ksps (3.7mW) and 2µA shutdown - extends battery life in portable data acquisition systems |
| Wide supply range | +2.7V to +5.25V operation - supports direct integration into mixed-voltage systems (e.g., 3.3V µC + 5V sensors) |
| Robust input protection | Clamp diodes allow safe overvoltage tolerance (GND−0.3V to VDD+0.3V) - enhances reliability in noisy industrial environments |
Applications
| Battery-Powered Data Logger | Isolated Sensor Interface |
|---|---|
Use Scenario: Compact handheld device logging temperature, pressure, and humidity using low-drift sensors and coin-cell battery. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; provides precise 12-bit resolution with minimal quiescent current between samples. Use Value: 1.9mA active current and 2µA shutdown enable >1-year battery life at 10s sampling intervals without compromising measurement fidelity. |
Use Scenario: Industrial field transmitter with galvanic isolation between sensor front-end and host PLC via optocouplers or digital isolators. IC Role / Device Role / Timing Role: Isolated-side ADC converting sensor signals before serial transmission across barrier; operates independently of host supply. Use Value: Single-supply +2.7V–+5.25V operation and external reference support simplify isolated power domain design while maintaining ±1 LSB INL accuracy. |
| Portable Instrumentation Front-End | Process Control Loop Monitor |
Use Scenario: Handheld multimeter or oscilloscope probe with auto-ranging analog conditioning feeding into microcontroller ADC subsystem. IC Role / Device Role / Timing Role: High-fidelity front-end ADC providing 73ksps sampling for real-time waveform capture and RMS calculation. Use Value: 7.5µs conversion time and 2.25MHz small-signal bandwidth support undersampling of kHz-range signals without aliasing filters. |
Use Scenario: Distributed I/O module acquiring analog process variables (4–20mA loop outputs, thermocouple voltages) in factory automation systems. IC Role / Device Role / Timing Role: Channelized ADC per sensor input; synchronized conversions triggered by PLC master over isolated serial bus. Use Value: SPI/QSPI compatibility enables direct connection to industrial microcontrollers (e.g., ARM Cortex-M4) without protocol translation hardware. |
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, 200ksps, no internal T/H, requires external sample clock | Higher speed but needs external track/hold or careful source impedance management | Select when throughput >73ksps is required and analog front-end can support faster acquisition |
| AD7476AARMZ | 2.35V–5.25V supply, 12-bit, SPI interface, 1MSPS, internal T/H, 350ns conversion, higher power (3.2mA @ 3V) | Ultra-fast conversion enables high-channel-density multiplexed systems | Select when sub-microsecond latency is critical and power budget allows ~3× higher active current |
Compared with ADS7822U and AD7476AARMZ, the MAX1241BCSA offers optimal balance of low power (1.9mA), integrated track/hold (removing external component risk), and proven 73ksps performance in space-constrained battery-operated designs - making it preferred for portable instrumentation where thermal and energy budgets are tight.
Availability
MAX1241BCSA is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, isolated data acquisition, and process control requiring stable component supply across extended production lifecycles.
Supply support for MAX1241BCSA 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 family was engineered specifically for ultra-low-power, high-accuracy data acquisition in size- and energy-constrained systems - emphasizing single-supply operation, integrated signal conditioning, and minimal external component count.
FAQ
What is the reference voltage requirement for MAX1241BCSA?
The MAX1241BCSA requires an external reference voltage applied to the REF pin, ranging from +1.0V to VDD (up to +5.25V). It does not include an internal reference. For optimal accuracy, the external reference must deliver ≤10Ω output impedance and sustain up to 250µA load during conversion. A minimum 0.1µF ceramic bypass capacitor is mandatory at the REF pin.
Does MAX1241BCSA support SPI Mode 0 (CPOL=0, CPHA=0)?
Yes, MAX1241BCSA fully supports SPI Mode 0. The serial interface uses CS falling edge to initiate conversion, DOUT transitions on SCLK falling edge, and outputs MSB-first with one leading end-of-conversion (EOC) bit. No configuration registers or setup commands are needed - it operates as a true hardware-SPI peripheral.
What is the minimum acquisition time before asserting CS on MAX1241BCSA?
The minimum acquisition time (tACQ) for MAX1241BCSA is 1.5µs - this is both the maximum time required to acquire the signal and the minimum time that must elapse after AIN settles before pulling CS low. If the source impedance exceeds 1kΩ, tACQ increases per tACQ = 9(RS + 9kΩ) × 16pF, requiring longer inter-conversion delays.
Can MAX1241BCSA operate from a 5V supply?
Yes, MAX1241BCSA is explicitly rated for +2.7V to +5.25V supply operation. At VDD = 5.25V, typical supply current is 2.8mA at 73ksps, and all absolute maximum ratings (e.g., AIN to GND = −0.3V to VDD + 0.3V) remain valid. The 8-pin SO package is qualified for this full voltage range.
How does shutdown mode function on MAX1241BCSA?
Driving SHDN low places MAX1241BCSA in shutdown mode, reducing supply current to ≤15µA. The device wakes up in 4µs (independent of shutdown duration) since it relies on an external reference. During wake-up, no conversions should be initiated until 4µs after SHDN returns high - unlike the MAX1240, no reference capacitor recharge delay applies.
MAX1241BCSA 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1241BCSA FAQ
1.How can I place an order for MAX1241BCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1241BCSA 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 MAX1241BCSA reliable?
The price and inventory of MAX1241BCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1241BCSA is usually 5 days.
3.What payment methods are accepted for MAX1241BCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1241BCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1241BCSA?
MAX1241BCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1241BCSA 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 MAX1241BCSA?
For technical support, including MAX1241BCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1241BCSA requirements.
6.How does Aetrix verify that MAX1241BCSA is sourced from the original manufacturer or authorized distributors?
All MAX1241BCSA 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 MAX1241BCSA meets industry standards.
7.What is the process for return or replacement of MAX1241BCSA?
All MAX1241BCSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1241BCSA, 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 MAX1241BCSA part is unused and in its original packaging.
Return procedure for MAX1241BCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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