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Analog Devices Inc./Maxim Integrated MAX1241AEPA
- Part No.:
- MAX1241AEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1241AEPA.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,041
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Product details
Overview
MAX1241AEPA 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 delivers ±0.5 LSB INL at 0°C to +70°C - ideal for portable data logging and isolated industrial sensor interfaces.
For engineers reviewing the MAX1241AEPA datasheet, MAX1241AEPA pinout, MAX1241AEPA application, or MAX1241AEPA equivalent, this page provides verified technical context, real-world design meaning 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 MAX1241AEPA implements a capacitive SAR architecture with integrated track/hold, eliminating need for external hold capacitors. Its conversion cycle begins on CS falling edge, completes in 7.5µs, and outputs unipolar 12-bit data MSB-first with a leading EOC bit via DOUT synchronized to SCLK's falling edge.
It operates exclusively with an external reference applied to the REF pin (no internal reference), accepts analog inputs from 0V to VREF, and supports reference voltages up to the positive supply rail. Shutdown mode reduces supply current to ≤2µA, with wake-up delay dependent on external REF bypass capacitance and supply stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization in precision sensing. |
| Sampling Rate | 73ksps - enables real-time capture of signals up to ~36.5kHz (Nyquist-limited) without aliasing in properly filtered systems. |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures monotonicity and <0.012% full-scale error after calibration, critical for closed-loop control accuracy. |
| Supply Voltage Range | +2.7V to +5.25V - supports direct interfacing with 3.3V and 5V microcontrollers and mixed-voltage sensor front-ends. |
| Power Consumption | 1.6mA typical at 3.6V/73ksps - enables battery operation for >1 week in 10ksps duty-cycled data loggers (e.g., 3.6V Li-ion, 500mAh). |
| Reference Input | External only, 0V to VDD range - allows flexible scaling (e.g., 2.5V, 3.0V, 4.096V) and integration with precision external references or DACs. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire - connects directly to standard MCU GPIO without level shifters or protocol translation. |
Pinout & Package
MAX1241AEPA is housed in an 8-pin plastic DIP (PDIP) package with through-hole mounting and 0.3-inch body width, suitable for prototyping, industrial control modules, and legacy PCB designs requiring robust mechanical retention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog core, digital logic, and internal track/hold - must be bypassed with 0.1µF + 4.7µF near pin. |
| AIN (Pin 2) | Analog input | Single-ended input referenced to GND; accepts 0V to VREF range; source impedance ≤1kΩ recommended for full AC performance. |
| SHDN (Pin 3) | Three-level shutdown control | Pull low for ≤2µA shutdown; leave open or pull high for active mode - no internal reference activation (unlike MAX1240). |
| REF (Pin 4) | External reference input | Input for user-supplied reference (1.0V to VDD); requires ≥0.1µF ceramic bypass; drives internal DAC and sets full-scale range. |
| GND (Pin 5) | Analog/digital common ground | Single-point star ground connection required; separates analog and digital return paths to minimize noise coupling into conversion. |
| DOUT (Pin 6) | Serial data output | Three-state output; goes high to signal end-of-conversion (EOC); shifts out 13-bit stream (1 EOC + 12 data bits) on SCLK falling edge. |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion and enables DOUT; must remain low until all 13 bits are clocked out to avoid trailing zeros. |
| SCLK (Pin 8) | Serial clock input | Asynchronous external clock up to 2.1MHz; duty cycle unrestricted if each phase ≥200ns; not required during conversion itself. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power 73ksps operation | 1.6mA supply current at 3.6V enables >100-hour runtime on AA batteries in periodic-sampling sensor nodes. |
| External reference flexibility | Supports 1.0V–VDD reference range, enabling use with ultra-low-noise bandgap references or programmable DACs for adaptive full-scale scaling. |
| Integrated track/hold | 1.5µs acquisition time eliminates external op-amp/held capacitor circuitry, reducing BOM count and layout area by ≥3 components. |
| 3-wire SPI-compatible interface | Requires only CS, SCLK, DOUT - compatible with most 8/16-bit MCUs without dedicated SPI hardware, simplifying firmware development. |
| Shutdown mode | ≤2µA quiescent current with fast wake-up (4µs) allows microsecond-level duty cycling for sub-µA average system power in wireless sensors. |
Applications
| Battery-Powered Data Logger | Isolated Industrial Sensor Interface |
|---|---|
|
Use Scenario: Compact environmental monitor logging temperature, humidity, and pressure every 5 seconds using coin-cell or Li-ion battery. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; handles timing via CS-triggered conversions and SCLK-synchronized readout. Use Value: 1.6mA active current and 2µA shutdown enable >2-year battery life; 3-wire interface minimizes MCU pin usage and firmware overhead. |
Use Scenario: DIN-rail mounted PLC module acquiring 4–20mA current loop signals across galvanic isolation barrier. IC Role / Device Role / Timing Role: Isolated-side ADC converting isolated analog inputs; synchronizes with master controller via opto-isolated CS/SCLK lines. Use Value: External reference support allows matching to isolated reference on primary side; 73ksps throughput accommodates anti-alias filtering for 10Hz–1kHz process variables. |
| Portable Medical Instrumentation | Process Control Transmitter |
|
Use Scenario: Handheld blood glucose meter digitizing amperometric sensor current with on-board calibration. IC Role / Device Role / Timing Role: Precision ADC capturing low-level analog signals; uses external 2.5V reference for stable full-scale definition across temperature. Use Value: ±0.5 LSB INL ensures accurate 16-bit-equivalent linearity after gain/offset correction; small PDIP package fits compact handheld enclosures. |
Use Scenario: Smart 4–20mA transmitter with HART modulation digitizing RTD or thermocouple inputs in hazardous-area field devices. IC Role / Device Role / Timing Role: Signal-chain ADC interfacing with sigma-delta sensor conditioner; operates from same 3.3V rail as HART modem and microcontroller. Use Value: +2.7V to +5.25V supply range allows direct tie to industrial 3.3V or 5V rails; 7.5µs conversion time supports HART-compliant response timing. |
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 | 12-bit, 200ksps, +2.7V to +5.25V, internal reference only, SPI-only interface, no SHDN pin. | Higher speed but fixed internal reference limits full-scale flexibility; lacks hardware shutdown control. | Select when higher throughput is critical and external reference is unnecessary; verify SPI timing compatibility with host MCU. |
| AD7892BRZ-1 | 12-bit, 200ksps, +4.75V to +5.25V only, internal reference, parallel/serial dual interface, 24-pin SOIC. | Narrower supply range excludes 3.3V systems; larger package increases board area; parallel mode adds complexity. | Choose for legacy 5V systems needing fastest possible conversion or parallel bus integration; not suitable for battery-powered or space-constrained designs. |
Compared with MAX1241AEPA, ADS7822U offers higher speed but sacrifices reference flexibility and shutdown control, while AD7892BRZ-1 demands 5V-only operation and occupies more PCB area - making MAX1241AEPA optimal for 3.3V/5V mixed-signal portable and industrial applications requiring external reference support and ultra-low shutdown current.
Availability
MAX1241AEPA is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensor interfaces, and portable medical instrumentation requiring stable component supply across extended production lifecycles.
Supply support for MAX1241AEPA 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, medical, and communications applications.
The MAX1240/MAX1241 family was designed for low-power, space-constrained data acquisition systems requiring precision 12-bit conversion with minimal external components and flexible reference architecture.
FAQ
What is the reference voltage requirement for MAX1241AEPA?
MAX1241AEPA 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. The reference must provide ≤10Ω output impedance and sustain up to 250µA load during conversion; a minimum 0.1µF ceramic bypass capacitor is mandatory at the REF pin for stability.
Does MAX1241AEPA support SPI mode with CPOL=0 and CPHA=0?
Yes, MAX1241AEPA is fully compatible with SPI mode 0 (CPOL=0, CPHA=0). Conversion starts on CS falling edge; DOUT goes low during conversion and high at completion (EOC). Data is clocked out MSB-first on SCLK falling edge, requiring 13 clock cycles for the full 12-bit result plus EOC bit.
What is the maximum sampling rate and corresponding conversion time for MAX1241AEPA?
MAX1241AEPA achieves a maximum sampling rate of 73ksps, with a guaranteed conversion time of 7.5µs. This includes internal SAR settling and is independent of SCLK frequency - the external clock is used only for data readout after conversion completes.
How does shutdown mode operate on MAX1241AEPA?
MAX1241AEPA enters shutdown mode when SHDN pin is pulled low, reducing supply current to ≤2µA. Unlike the MAX1240, SHDN has no reference-enable function. Wake-up time is ~4µs after SHDN is deasserted, allowing rapid duty-cycled operation in ultra-low-power sensor nodes.
Can MAX1241AEPA accept analog inputs beyond the reference voltage?
No - MAX1241AEPA accepts analog inputs strictly within 0V to VREF. Exceeding VREF risks code ambiguity and measurement error. Input protection diodes clamp to VDD and GND, but for accurate conversion, AIN must stay within VREF ±50mV; absolute max ratings allow only -0.3V to VDD+0.3V without damage.
MAX1241AEPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1241AEPA FAQ
1.How can I place an order for MAX1241AEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1241AEPA 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 MAX1241AEPA reliable?
The price and inventory of MAX1241AEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1241AEPA is usually 5 days.
3.What payment methods are accepted for MAX1241AEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1241AEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1241AEPA?
MAX1241AEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1241AEPA 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 MAX1241AEPA?
For technical support, including MAX1241AEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1241AEPA requirements.
6.How does Aetrix verify that MAX1241AEPA is sourced from the original manufacturer or authorized distributors?
All MAX1241AEPA 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 MAX1241AEPA meets industry standards.
7.What is the process for return or replacement of MAX1241AEPA?
All MAX1241AEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1241AEPA, 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 MAX1241AEPA part is unused and in its original packaging.
Return procedure for MAX1241AEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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