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Analog Devices Inc./Maxim Integrated MAX1242BEPA+
- Part No.:
- MAX1242BEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1242BEPA+.pdf
- Description:
- IC ADC 10BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,875
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Product details
Overview
MAX1242BEPA+ from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (ADC) with internal 2.5V reference, single +2.7V to +5.25V supply operation, 73ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It features 1.5µs track/hold acquisition time, ±1 LSB integral nonlinearity, and operates across –40°C to +85°C in 8-pin PDIP package - ideal for space-constrained industrial sensor nodes and portable data loggers.
For engineers reviewing the MAX1242BEPA+ datasheet, MAX1242BEPA+ pinout, MAX1242BEPA+ application, or MAX1242BEPA+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX1242BEPA+ implements a SAR architecture with integrated track/hold and on-chip clock, enabling full 10-bit conversion in 7.5µs. Its internal 2.5V reference is trimmed to ±0.25% initial accuracy and exhibits ±30ppm/°C temperature coefficient, enabled when SHDN is pulled high.
It uses unipolar serial output format: one leading EOC bit, ten data bits (MSB first), two sub-bits, and trailing zeros. The 3-wire interface requires only SCLK, CS, and DOUT - compatible with standard microcontroller I/O ports without level-shifting at 3V or 5V logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes over full-scale input range |
| Sampling Rate | 73ksps - supports real-time monitoring of signals up to ~36.5kHz Nyquist bandwidth |
| INL | ±1 LSB - ensures monotonicity and <0.1% full-scale linearity error across operating temperature |
| Reference | Internal 2.5V (±0.25% initial, ±30ppm/°C) - eliminates external reference component and layout complexity |
| Power Consumption | 3.0mA typical at 3V/73ksps - enables battery-powered operation with <3mW active power |
| Shutdown Current | 2µA max - reduces average system power when sampling intermittently (e.g., 1ksps → ~66µW) |
| Small-Signal Bandwidth | 2.25MHz - allows accurate digitization of fast transients and undersampling of higher-frequency signals |
Pinout & Package
MAX1242BEPA+ is housed in an 8-pin plastic dual in-line package (PDIP) with gull-wing leads, RoHS-compliant and lead-free. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise orientation from top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | Accepts +2.7V to +5.25V single supply; bypassing with 0.1µF ceramic near pin is mandatory for noise immunity |
| 2 AIN | Analog input | Unipolar input range 0V to VREF (2.5V); protected to GND–0.3V / VDD+0.3V; source impedance ≤4kΩ recommended |
| 3 SHDN | Three-level shutdown control | Pulled high → enables internal reference; open → disables internal reference (allows external REF); pulled low → 2µA shutdown mode |
| 4 REF | Reference voltage node | Outputs 2.5V (MAX1242) or accepts external 1.0V–VDD reference; requires 4.7µF tantalum bypass for internal ref stability |
| 5 GND | Analog and digital ground | Single ground connection point - must be low-impedance and star-connected to minimize noise coupling |
| 6 DOUT | Serial data output | 3-wire interface output; high-impedance when CS = high; transitions on SCLK falling edge; MSB-first format |
| 7 CS | Active-low chip select | Falling edge initiates conversion and forces T/H into hold mode; rising edge disables DOUT (high-Z) |
| 8 SCLK | Serial clock input | Accepts up to 2.1MHz clock; duty cycle unrestricted if each phase ≥200ns; must remain low during conversion |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates need for negative rail or LDO sequencing in portable systems |
| Integrated track/hold | 1.5µs acquisition time - removes external sample-and-hold IC and associated timing complexity |
| SPI/QSPI/MICROWIRE compatibility | No protocol translation required - direct connection to common MCU peripheral interfaces with CPOL=0, CPHA=0 |
| Internal 2.5V reference | ±0.25% initial accuracy, ±30ppm/°C drift - provides stable scaling without external precision reference IC or resistor network |
| Extended temperature range | –40°C to +85°C - qualified for industrial environments including process control and remote telemetry |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10–100Hz intervals. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs; internal reference ensures consistent scaling across thermal cycles. Use Value: 2µA shutdown current extends battery life to multi-year operation; SO-8 footprint minimizes PCB area in compact enclosures. |
Use Scenario: PLC analog input module acquiring 4–20mA loop signals from field transmitters in factory automation. IC Role / Device Role / Timing Role: Front-end ADC converts isolated current-loop voltages; 73ksps rate supports oversampling for noise reduction. Use Value: ±1 LSB INL maintains calibration integrity over 20-year equipment lifetime; –40°C to +85°C rating ensures reliability in unconditioned cabinets. |
| Test Equipment | Temperature Measurement |
Use Scenario: Handheld multimeter with autoranging and true RMS calculation requiring precise DC and low-frequency AC sampling. IC Role / Device Role / Timing Role: Primary digitizer for analog front end; internal 2.5V reference serves as stable scaling source for gain calibration. Use Value: 2.25MHz small-signal bandwidth enables accurate capture of transient spikes and harmonics up to 5th order. |
Use Scenario: Thermistor-based HVAC thermostat measuring ambient air temperature with 0.1°C resolution. IC Role / Device Role / Timing Role: Converts ratiometric thermistor divider output; internal reference eliminates ratio errors from supply variation. Use Value: 10-bit resolution maps to <0.05°C step size over 0–50°C range; low 3mW power prevents self-heating error in sealed housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1242BCSA+ | Same core ADC, but 8-pin SO package (S8+5) and 0°C to +70°C temp grade; ±1 LSB INL | Preferred for commercial-grade PCB assemblies where surface-mount and reflow compatibility are required | Select when board space is constrained and extended temperature is not needed; SO package offers better thermal performance and smaller footprint |
| ADS7822U | 12-bit SAR ADC, 200ksps, 2.7–5.25V supply, SPI interface, no internal reference - requires external 2.5V ref | Used where higher resolution justifies added BOM cost and layout effort for reference IC and decoupling | Choose when 12-bit resolution is mandatory and system can accommodate external reference design; not drop-in compatible due to different pinout and reference architecture |
Compared with MAX1242BCSA+, the MAX1242BEPA+ trades SO-package manufacturability for extended temperature operation and through-hole assembly flexibility; compared with ADS7822U, it sacrifices 2-bit resolution to eliminate external reference dependency and reduce total solution size and cost.
Availability
MAX1242BEPA+ is available at Aetrix Electronics and suitable for industrial sensor nodes, portable data loggers, and process control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1242BEPA+ 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 industrial, medical, and communications applications, emphasizing low power, high integration, and robust performance.
The MAX1242 series belongs to Maxim's low-power serial ADC product line, engineered specifically for battery-operated and space-constrained measurement systems needing reliable 10-bit conversion without external support components.
FAQ
What is the operating temperature range of the MAX1242BEPA+?
The MAX1242BEPA+ is rated for –40°C to +85°C operation, making it suitable for industrial environments such as factory floor instrumentation, outdoor telemetry units, and automotive under-hood sensing applications where ambient temperatures exceed commercial-grade limits. This range is confirmed in the Ordering Information table and Electrical Characteristics section of the official datasheet.
Does the MAX1242BEPA+ require an external reference voltage?
No - the MAX1242BEPA+ includes a factory-trimmed 2.5V internal reference with ±0.25% initial accuracy and ±30ppm/°C temperature coefficient. It is enabled automatically when the SHDN pin is pulled high. An external reference may be used only if SHDN is left floating, but that configuration is not typical for the MAX1242BEPA+ variant.
What is the maximum sampling rate supported by the MAX1242BEPA+?
The MAX1242BEPA+ achieves a maximum throughput rate of 73ksps (73,000 samples per second) at fSCLK = 2.1MHz, with a guaranteed conversion time of 7.5µs. This rate is maintained across the full supply range (+2.7V to +5.25V) and temperature range (–40°C to +85°C), as specified in the Electrical Characteristics table.
How does the shutdown mode function on the MAX1242BEPA+?
The MAX1242BEPA+ enters shutdown mode when the SHDN pin is pulled low, reducing supply current to ≤2µA. In this state, the internal reference and analog circuitry are disabled. Wake-up time depends on whether the internal reference capacitor (4.7µF on REF) has fully discharged - typically up to 20ms after prolonged shutdown, as shown in Figure 7 of the datasheet.
Is the MAX1242BEPA+ pin-compatible with other devices in the MAX124x family?
Yes - the MAX1242BEPA+ shares identical 8-pin PDIP pinout with all MAX1242 variants (e.g., MAX1242AEPA+, MAX1242CEPA+) and MAX1243 variants in PDIP packages. However, it is not pin-compatible with SO-package versions (e.g., MAX1242BESA+) due to differing physical footprints and land patterns.
MAX1242BEPA+ 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:
- 10
- 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, Internal
- 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:
- -
MAX1242BEPA+ FAQ
1.How can I place an order for MAX1242BEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1242BEPA+ 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 MAX1242BEPA+ reliable?
The price and inventory of MAX1242BEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1242BEPA+ is usually 5 days.
3.What payment methods are accepted for MAX1242BEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1242BEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1242BEPA+?
MAX1242BEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1242BEPA+ 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 MAX1242BEPA+?
For technical support, including MAX1242BEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1242BEPA+ requirements.
6.How does Aetrix verify that MAX1242BEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX1242BEPA+ 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 MAX1242BEPA+ meets industry standards.
7.What is the process for return or replacement of MAX1242BEPA+?
All MAX1242BEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1242BEPA+, 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 MAX1242BEPA+ part is unused and in its original packaging.
Return procedure for MAX1242BEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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