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Analog Devices Inc./Maxim Integrated MAX1242BCPA+
- Part No.:
- MAX1242BCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MAX1242BCPA+.pdf
- Description:
- IC ADC 10BIT SERIAL 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,642
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Product details
Overview
MAX1242BCPA+ 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, ±1 LSB integral nonlinearity, and 8-pin PDIP package - used in portable data loggers and isolated sensor interfaces where space and power are constrained.
For engineers reviewing the MAX1242BCPA+ datasheet, MAX1242BCPA+ pinout, MAX1242BCPA+ application, or MAX1242BCPA+ equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX1242BCPA+ employs a capacitive 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 and enabled by pulling SHDN high, delivering ±30ppm/°C tempco and 2.470V–2.530V output at +25°C.
It operates in two modes: normal (3.0mA typical supply current at VDD = 3.6V, 73ksps) and shutdown (≤2µA), with wake-up time dependent on external 4.7µF REF bypass capacitor discharge. The 3-wire serial interface supports up to 2.1MHz SCLK, outputs unipolar MSB-first data with EOC flag, and requires no external clock for conversion completion.
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 temperature |
| Reference | Internal 2.5V (SHDN = high) - eliminates external reference component, reduces BOM count and layout area |
| Power Consumption | 3.0mA @ 3.6V, 73ksps - enables battery-powered operation for >100 hours with 300mAh cell |
| Track/Hold Acquisition | 1.5µs - allows accurate sampling of fast transients without external sample-hold circuitry |
| Serial Interface | SPI/QSPI/MICROWIRE 3-wire - directly connects to standard MCU GPIOs without level-shifting or protocol translation |
Pinout & Package
MAX1242BCPA+ is housed in an 8-pin plastic dual in-line package (PDIP) with through-hole mounting and RoHS-compliant lead finish. Pin spacing is 0.300", body width 0.355", and thermal resistance θJA = 90.9°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | Accepts +2.7V to +5.25V; powers analog core, reference, and digital logic - decoupling required within 1cm |
| AIN (Pin 2) | Analog input | 0V to VREF unipolar range; input protection clamps ±0.3V beyond rails; source impedance ≤4kΩ preserves AC performance |
| SHDN (Pin 3) | Three-level shutdown control | Pull low → shutdown (<2µA); pull high → enable internal 2.5V ref; leave open → disable internal ref for external reference use |
| REF (Pin 4) | Reference voltage node | 2.5V output (MAX1242 only) - bypass with 4.7µF capacitor; or external 1.0V–VDD input - bypass ≥0.1µF |
| GND (Pin 5) | Analog/digital common ground | Single-point star ground connection required; separates analog and digital return paths internally |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high-Z DOUT when CS = high; minimum pulse width 240ns |
| SCLK (Pin 8) | Serial clock input | Drives data shift-out; max 2.1MHz; duty cycle unrestricted if ≥200ns per phase; must be low during conversion |
| DOUT (Pin 6) | Serial data output | MSB-first unipolar format; EOC flag = high; transitions on SCLK falling edge; high-impedance when CS = high |
Key Features
| Feature | Design Value |
|---|---|
| +2.7V to +5.25V single-supply operation | Eliminates dual-rail supplies and simplifies power design for mixed-signal embedded systems |
| Internal 2.5V reference (MAX1242 only) | Reduces system component count and PCB area; factory-trimmed to ±0.5% initial accuracy |
| 1.5µs track/hold acquisition time | Enables direct sampling of fast step inputs without external buffering or settling delay penalties |
| 3-wire SPI/QSPI/MICROWIRE interface | Minimizes GPIO usage and firmware overhead; compatible with legacy and modern microcontrollers |
| 2µA shutdown current | Extends battery life in intermittent-sampling applications such as environmental sensors and metering |
| ±1 LSB INL over 0°C to +70°C | Guarantees monotonic behavior and <0.1% full-scale error without calibration in industrial temperature range |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure at 10s intervals. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs; internal reference eliminates need for precision external voltage source. Use Value: 3.0mA active current and 2µA shutdown enable multi-year operation on coin-cell; 8-pin PDIP eases hand-soldering in low-volume prototyping. |
Use Scenario: DIN-rail mounted PLC analog input module acquiring 4–20mA loop signals from field transmitters. IC Role / Device Role / Timing Role: Front-end ADC converts isolated current-loop outputs to digital values for microcontroller processing. Use Value: ±1 LSB INL ensures repeatability across temperature; 73ksps supports oversampling for noise reduction in noisy industrial environments. |
| Temperature Measurement | Isolated Data Acquisition |
Use Scenario: Medical thermometer using thermistor or RTD with op-amp signal conditioning. IC Role / Device Role / Timing Role: Precision ADC captures small ΔV from bridge circuits; internal 2.5V reference provides stable scaling. Use Value: 2.5V reference tempco of ±30ppm/°C limits gain drift to <0.03% over 0°C–70°C, improving absolute accuracy. |
Use Scenario: High-voltage motor drive monitoring phase currents via isolated shunt amplifiers. IC Role / Device Role / Timing Role: ADC receives conditioned, galvanically isolated analog signals; 3-wire interface crosses isolation barrier with minimal components. Use Value: 1.5µs acquisition time supports accurate sampling of fast current transients; 8-pin PDIP simplifies creepage/clearance layout in safety-critical designs. |
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 |
|---|---|---|---|
| MAX1242ACPA+ | ±0.5 LSB INL (vs. ±1 LSB), same package/temp grade - tighter linearity spec | Better suited for high-accuracy calibration-critical systems like medical diagnostics | Select MAX1242ACPA+ when absolute linearity error must remain below 0.05% FS across temperature |
| MAX1243BCPA+ | No internal reference; requires external 1.0V–VDD reference - higher design flexibility but adds BOM cost | Preferred where system already provides precision reference (e.g., shared bandgap for multiple ADCs) | Choose MAX1243BCPA+ when leveraging existing reference infrastructure or needing >2.5V full-scale range |
Compared with MAX1242BCPA+, MAX1242ACPA+ offers improved linearity at identical power and footprint, while MAX1243BCPA+ trades internal reference convenience for external reference flexibility - both maintain pin compatibility and identical timing, allowing board reuse with minor schematic updates.
Availability
MAX1242BCPA+ is available at Aetrix Electronics and suitable for portable data logging, process control monitoring, and temperature measurement requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.
Supply support for MAX1242BCPA+ 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 precision analog, mixed-signal, and power management ICs for industrial, medical, and communications systems.
The MAX1242/MAX1243 product line was designed for ultra-low-power, space-constrained data acquisition in battery-operated and isolated sensor front-ends - emphasizing integration, ease of use, and guaranteed performance over temperature.
FAQ
What is the operating temperature range for MAX1242BCPA+?
The MAX1242BCPA+ is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range is validated per the device's ordering information table and applies to all DC and dynamic specifications including INL (±1 LSB), supply current, and reference voltage accuracy. Operation outside this range may result in parametric degradation not covered by Maxim's warranty.
Does MAX1242BCPA+ require an external reference capacitor?
Yes, MAX1242BCPA+ requires a 4.7µF capacitor at the REF pin when using its internal 2.5V reference. This capacitor stabilizes the reference output and ensures specified accuracy during conversion; omitting it causes reference droop and increased INL. The capacitor must be placed within 5mm of the REF pin with low-ESR characteristics.
How does the SHDN pin function on MAX1242BCPA+?
On MAX1242BCPA+, the SHDN pin is a three-level control: pulled low → shutdown mode (<2µA supply current); pulled high → enables internal 2.5V reference and normal operation; left open → disables internal reference, allowing external reference use. This dual functionality is unique to the MAX1242 variant and is explicitly defined in the Pin Description section.
Can MAX1242BCPA+ interface directly with an SPI host controller?
Yes, MAX1242BCPA+ supports SPI mode with CPOL = 0 and CPHA = 0. Its 3-wire interface (CS, SCLK, DOUT) is electrically and logically compatible - DOUT transitions on SCLK falling edge, and data is MSB-first. No level shifting or protocol translation is needed for standard 3.3V or 5V SPI masters.
What is the maximum clock frequency supported by MAX1242BCPA+ for data readout?
MAX1242BCPA+ supports a maximum SCLK frequency of 2.1MHz for serial data readout. This limit is specified under Electrical Characteristics and ensures reliable timing margins for tDV (data valid after SCLK fall) and tSTR (SCLK rise to DOUT rise). Exceeding 2.1MHz risks data corruption due to insufficient setup/hold times.
MAX1242BCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
MAX1242BCPA+ FAQ
1.How can I place an order for MAX1242BCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1242BCPA+ 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 MAX1242BCPA+ reliable?
The price and inventory of MAX1242BCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1242BCPA+ is usually 5 days.
3.What payment methods are accepted for MAX1242BCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1242BCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1242BCPA+?
MAX1242BCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1242BCPA+ 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 MAX1242BCPA+?
For technical support, including MAX1242BCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1242BCPA+ requirements.
6.How does Aetrix verify that MAX1242BCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX1242BCPA+ 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 MAX1242BCPA+ meets industry standards.
7.What is the process for return or replacement of MAX1242BCPA+?
All MAX1242BCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1242BCPA+, 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 MAX1242BCPA+ part is unused and in its original packaging.
Return procedure for MAX1242BCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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