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Analog Devices Inc./Maxim Integrated MAX1242BCSA+
- Part No.:
- MAX1242BCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1242BCSA+.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,288
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Product details
Overview
MAX1242BCSA+ from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (ADC) with internal 2.5V reference, 7.5µs conversion time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It operates from a single +2.7V to +5.25V supply, consumes only 3mW at 73ksps, and features 1.5µs track/hold acquisition - ideal for portable data logging and isolated sensor interfaces where space and power are constrained.
For engineers reviewing the MAX1242BCSA+ datasheet, MAX1242BCSA+ pinout, MAX1242BCSA+ application, or MAX1242BCSA+ equivalent, this page delivers verified technical context, SO-8 package mapping, real-world timing behavior, confirmed INL (±1 LSB), and validated alternatives for remote-sensing and battery-powered acquisition systems.
Technical Context
The MAX1242BCSA+ implements a SAR architecture with integrated track/hold and on-chip clock, enabling full 10-bit conversion in 7.5µs without external timing components. Its internal 2.5V reference is trimmed and temperature-stable (±30 ppm/°C), enabled when SHDN is pulled high.
Conversion is initiated by a falling edge on CS; DOUT signals end-of-conversion (EOC) with a rising edge, then outputs MSB-first serial data synchronized to SCLK (up to 2.1MHz). The device supports unipolar 0V–VREF input range and exhibits 66dB SINAD and 70dB SFDR at 10kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes over full-scale range. |
| Conversion Time | 7.5 µs - defines minimum inter-conversion interval at maximum throughput. |
| Sampling Rate | 73 ksps - maximum sustained sampling rate under VDD = 3V, fSCLK = 2.1MHz. |
| INL | ±1 LSB - ensures monotonicity and ≤0.1% full-scale linearity error across temperature. |
| Supply Current | 3.0 mA typical at VDD = 3.6V, 73ksps - enables <3.7mW active power at 3V. |
| Shutdown Current | 2 µA - reduces system-level power during idle intervals without external control logic. |
| Reference | Internal 2.5V ±0.3% (25°C), ±30 ppm/°C drift - eliminates need for external reference IC in cost-sensitive designs. |
Pinout & Package
MAX1242BCSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard JEDEC SO-8 footprint (outline 21-0041, land pattern 90-0096).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | +2.7V to +5.25V analog/digital rail; bypassing required for noise immunity. |
| 2 AIN | Analog input | Unipolar 0V to VREF sampling node; protected to GND−0.3V / VDD+0.3V. |
| 3 SHDN | Three-level shutdown control | Pull low → 2µA shutdown; high → enable internal reference; open → disable reference for external use. |
| 4 REF | Reference voltage terminal | 2.5V output (MAX1242); bypass with 4.7µF capacitor for stability and wake-up performance. |
| 5 GND | Analog and digital ground | Single common ground plane required; separation from noisy digital returns degrades AC performance. |
| 6 DOUT | Serial data output | 3-wire interface output; high-impedance when CS = high; transitions on SCLK falling edge. |
| 7 CS | Active-low chip select | Falling edge initiates conversion; must remain low until EOC asserted; controls DOUT enable/disable timing. |
| 8 SCLK | Serial clock input | Asynchronous clock up to 2.1MHz; duty cycle unrestricted if ≥200ns per phase; no clock during conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates dual-rail supplies and simplifies battery-powered system design. |
| Integrated track/hold | 1.5 µs acquisition time - supports direct connection to medium-impedance sensors (<4kΩ) without external buffering. |
| 3-wire serial interface | SPI/QSPI/MICROWIRE compatible - interoperates with standard microcontroller peripherals without protocol translation. |
| Internal reference | 2.5V ±0.3%, ±30 ppm/°C - reduces BOM count and PCB area versus external reference solutions. |
| Low-power shutdown | 2 µA max current - enables >1000× reduction in quiescent power between conversions for duty-cycled sensing. |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
|
Use Scenario: Battery-powered environmental sensor nodes recording temperature, humidity, and pressure over extended periods. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; provides precise 10-bit resolution with minimal power overhead per sample. Use Value: 3mW active power and 2µA shutdown current extend battery life to months; SO-8 footprint conserves board area in compact enclosures. |
Use Scenario: Industrial PLC analog input modules acquiring signals from 4–20mA transmitters and RTDs in factory automation. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with stable internal reference, supporting ratiometric or absolute measurement modes. Use Value: ±1 LSB INL and 66dB SINAD ensure reliable detection of small process deviations; 73ksps throughput handles multi-channel scanning. |
| Test Equipment | Temperature Measurement |
|
Use Scenario: Handheld multimeters and portable oscilloscope accessories requiring fast, repeatable DC and low-frequency AC measurements. IC Role / Device Role / Timing Role: Precision digitizer with calibrated transfer function and low aperture jitter (<50ps) for accurate RMS and peak detection. Use Value: 7.5µs conversion time enables rapid sampling; internal reference eliminates drift-related calibration drift in field instruments. |
Use Scenario: Digital thermometers and HVAC controllers using thermistors or silicon sensors with analog output stages. IC Role / Device Role / Timing Role: Signal-chain ADC converting conditioned voltage from sensor interface circuits into digital temperature values. Use Value: 1.5µs track/hold acquisition allows direct sampling of slow-varying thermal signals; 2.5V reference ensures consistent LSB scaling across units. |
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 |
|---|---|---|---|
| MAX1242ACSA+ | Same SO-8 package and pinout; tighter INL (±0.5 LSB vs. ±1 LSB) and extended 0°C to +70°C temp range. | Better suited for precision instrumentation where linearity error directly impacts measurement uncertainty. | Select MAX1242ACSA+ when ±0.5 LSB INL is required and cost premium is acceptable. |
| MAX1243BCSA+ | Identical SO-8 package and timing; requires external reference (no internal 2.5V ref); accepts 1.0V–VDD reference range. | Enables flexible full-scale adjustment (e.g., 3.3V or 5V reference) and improved PSR in noisy environments. | Choose MAX1243BCSA+ when external reference control, wider VREF range, or better supply rejection is needed. |
Compared with MAX1242BCSA+, MAX1242ACSA+ offers higher linearity at identical power and speed, while MAX1243BCSA+ trades internal reference convenience for reference flexibility and external noise immunity - both require no PCB changes but differ in reference architecture and accuracy grade.
Availability
MAX1242BCSA+ is available at Aetrix Electronics and suitable for portable data logging, process control monitoring, and test equipment requiring stable component supply, RoHS compliance, and guaranteed SO-8 packaging.
Supply support for MAX1242BCSA+ 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 applications.
The MAX1242/MAX1243 product line was designed for ultra-low-power, space-constrained data acquisition systems requiring high-resolution ADC functionality with minimal external components and robust serial interfacing.
FAQ
What is the operating temperature range for MAX1242BCSA+?
The MAX1242BCSA+ is specified for operation from 0°C to +70°C. This commercial-grade temperature range is validated per the manufacturer's ordering information table and applies to all electrical characteristics unless otherwise noted. The device maintains ±1 LSB INL and 73ksps throughput across this full range, with internal reference drift limited to ±30 ppm/°C.
Does MAX1242BCSA+ require an external reference capacitor?
Yes, MAX1242BCSA+ requires a 4.7µF capacitor at the REF pin to stabilize its internal 2.5V reference. This capacitor is mandatory for achieving specified accuracy and minimizing wake-up delay after shutdown. Smaller values degrade reference settling and increase INL; larger values extend wake-up time but improve low-frequency noise rejection.
How does the SHDN pin function on MAX1242BCSA+?
On MAX1242BCSA+, the SHDN pin operates in three states: pulled low → 2µA shutdown mode; pulled high → internal 2.5V reference enabled and device operational; left open → internal reference disabled, allowing external reference use. This three-level control eliminates need for additional logic to manage reference selection.
What is the maximum SCLK frequency supported by MAX1242BCSA+?
MAX1242BCSA+ supports SCLK frequencies up to 2.1MHz, with no restriction on duty cycle provided each high/low phase is ≥200ns. This allows compatibility with standard microcontroller SPI peripherals clocked at up to 2.1MHz, enabling full 10-bit data readout in ≤5.95µs after EOC assertion.
Is MAX1242BCSA+ pin-compatible with any 12-bit upgrade options?
Yes, MAX1242BCSA+ is pin-compatible with the 12-bit MAX1240/MAX1241 family. Identical SO-8 pinout and serial interface protocol allow drop-in replacement where higher resolution is needed, though software must accommodate 12-bit data format and updated timing margins.
MAX1242BCSA+ 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:
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1242BCSA+ FAQ
1.How can I place an order for MAX1242BCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1242BCSA+ 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 MAX1242BCSA+ reliable?
The price and inventory of MAX1242BCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1242BCSA+ is usually 5 days.
3.What payment methods are accepted for MAX1242BCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1242BCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1242BCSA+?
MAX1242BCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1242BCSA+ 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 MAX1242BCSA+?
For technical support, including MAX1242BCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1242BCSA+ requirements.
6.How does Aetrix verify that MAX1242BCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX1242BCSA+ 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 MAX1242BCSA+ meets industry standards.
7.What is the process for return or replacement of MAX1242BCSA+?
All MAX1242BCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1242BCSA+, 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 MAX1242BCSA+ part is unused and in its original packaging.
Return procedure for MAX1242BCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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