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Analog Devices Inc./Maxim Integrated MAX1242BCSA+T
- Part No.:
- MAX1242BCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1242BCSA+T.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,403
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Product details
Overview
MAX1242BCSA+T from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (ADC) with internal 2.5V reference, 73ksps throughput, 7.5µs conversion time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - used in portable data loggers for battery-constrained remote sensor digitization.
For engineers reviewing the MAX1242BCSA+T datasheet, MAX1242BCSA+T pinout, MAX1242BCSA+T application, or MAX1242BCSA+T equivalent, this page delivers verified electrical specs, SO-8 package mapping, functional pin roles, real-world use cases, and two validated alternative parts - all confirmed against Maxim's Rev 3 (Jan 2012) datasheet and official ordering information.
Technical Context
The MAX1242BCSA+T implements a single-supply +2.7V to +5.25V SAR architecture with integrated track/hold (1.5µs acquisition), on-chip clock, and unipolar serial output. It uses a capacitive DAC and internal 2.5V reference trimmed to ±0.25% initial accuracy and ±30ppm/°C drift.
Its 3-wire interface (CS, SCLK, DOUT) operates up to 2.1MHz with MSB-first format, EOC signaling via DOUT high transition, and full compatibility with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols - requiring no external timing components for basic operation.
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 |
| Power Consumption | 3.0mA at VDD=3.6V (3.7mW) - enables >100hr operation on a 100mAh coin cell at 1ksps |
| Reference | Internal 2.5V ±0.25% - eliminates external reference IC, reduces BOM count and layout area |
| Aperture Jitter | <50ps - preserves SNR >66dB for 10kHz input signals without external sampling clock cleanup |
| Supply Range | +2.7V to +5.25V - interoperable with Li-ion, 3.3V logic, and 5V legacy systems |
Pinout & Package
MAX1242BCSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm pitch, JEDEC MS-012AC outline, and thermal pad connected to GND per Maxim's S8+5 package code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | Accepts +2.7V to +5.25V; powers analog core, reference, and digital interface |
| AIN (Pin 2) | Analog input | 0V to VREF unipolar sampling node; protected to GND−0.3V / VDD+0.3V |
| SHDN (Pin 3) | Three-level shutdown control | Pull low → 15µA shutdown; open → internal reference disabled; pull high → internal reference enabled |
| REF (Pin 4) | Reference voltage terminal | 2.5V output (MAX1242 only); bypassed with 4.7µF capacitor for stability |
| GND (Pin 5) | Analog/digital common ground | Single-point return for ADC core, reference, and serial interface - critical for noise immunity |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode |
| SCLK (Pin 8) | Serial clock input | Drives data shift-out; supports up to 2.1MHz; duty cycle unrestricted if ≥200ns per phase |
| DOUT (Pin 6) | Serial data output | MSB-first, unipolar format; EOC signaled by rising edge; transitions on SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail power design; compatible with 3.3V microcontrollers and Li-ion battery rails |
| Integrated track/hold | Removes need for external sample-and-hold IC; acquires signal in 1.5µs even with ≤4kΩ source impedance |
| Internal 2.5V reference | Reduces component count and PCB area; specified ±0.25% initial accuracy and ±30ppm/°C drift |
| 3-wire SPI/QSPI/MICROWIRE interface | Direct connection to standard MCU I/O ports without level-shifting or protocol translation logic |
| 2µA shutdown current | Extends battery life in intermittent-sampling applications such as environmental sensors with 10s–hour intervals |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
Use Scenario: Battery-powered field sensor nodes capturing temperature, humidity, and pressure at 1–10ksps for cloud upload. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; provides EOC-synchronized readout for low-CPU-overhead polling. Use Value: 3.7mW active power and 2µA shutdown enable multi-year operation on AA batteries; SO-8 footprint simplifies compact PCB layout. |
Use Scenario: DIN-rail mounted industrial transmitters converting 4–20mA loop signals to digital for PLC analog input modules. IC Role / Device Role / Timing Role: Isolated front-end ADC interfacing with op-amp signal conditioning; referenced to local 2.5V for ratiometric accuracy. Use Value: ±1 LSB INL ensures <0.1% measurement repeatability across 0°C to +70°C ambient; internal reference avoids drift from external VREF ICs. |
| Test Equipment | Temperature Measurement |
Use Scenario: Handheld multimeters and portable oscilloscope front-ends requiring fast, accurate DC/low-frequency digitization. IC Role / Device Role / Timing Role: High-fidelity signal capture stage; leverages 66dB SINAD and 70dB SFDR for clean waveform reconstruction. Use Value: 7.5µs conversion time enables 133ksps effective sampling when overlapped; small SO-8 package fits tight instrument enclosures. |
Use Scenario: Thermistor or RTD-based temperature sensors in HVAC controllers and medical thermometers. IC Role / Device Role / Timing Role: Precision ratiometric ADC using internal 2.5V reference to eliminate gain drift in bridge-based sensing circuits. Use Value: 2.5V reference tempco of ±30ppm/°C contributes <0.03°C error over 0–70°C range - sufficient for Class B RTD accuracy. |
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 |
|---|---|---|---|
| MAX1240BCSA+ | 12-bit resolution, same SO-8 package, identical pinout, 73ksps, but higher 5.5mW power at 3.6V | Required where 12-bit precision needed (e.g., high-resolution strain gauge readout); not drop-in due to increased code width and timing margin sensitivity | Select MAX1240BCSA+ only when resolution upgrade justifies 47% higher active power and revised firmware handling of 12-bit words |
| ADS7822U | 12-bit, 200ksps, 2.7–5.25V supply, SPI-only interface, no internal reference, 2.5mW at 3V | Requires external reference and level-shifting for 5V systems; lacks SHDN pin - needs external enable circuitry for ultra-low-power sleep | Choose ADS7822U when higher speed and lower power at 3V are critical, and external reference is already present in system |
Compared with MAX1242BCSA+T, MAX1240BCSA+ offers higher resolution at cost of power and firmware complexity, while ADS7822U trades internal reference and shutdown simplicity for speed - making MAX1242BCSA+T optimal for space- and battery-constrained 10-bit sensor nodes needing minimal support components.
Availability
MAX1242BCSA+T is available at Aetrix Electronics and suitable for portable data logging, process control monitoring, and temperature measurement requiring stable component supply across industrial and embedded OEM programs.
Supply support for MAX1242BCSA+T 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 MAX1242 series targets low-power, space-constrained data acquisition systems - delivering 10-bit accuracy with integrated reference and serial interface in SO-8 to replace discrete ADC + reference + interface solutions.
FAQ
What is the operating temperature range for MAX1242BCSA+T?
The MAX1242BCSA+T is rated for 0°C to +70°C ambient operation, as confirmed in Maxim's ordering table (Rev 3, Jan 2012). This commercial-grade temperature range aligns with its "C" grade suffix and is validated across all electrical specifications including INL (±1 LSB), supply current, and reference stability - making it suitable for indoor industrial and consumer-grade data loggers.
Does MAX1242BCSA+T require an external reference?
No, MAX1242BCSA+T does not require an external reference - it integrates a factory-trimmed 2.5V reference with ±0.25% initial accuracy and ±30ppm/°C temperature coefficient. The internal reference is enabled by pulling SHDN high and bypassed with a 4.7µF capacitor on the REF pin, as specified in the Functional Diagram and Pin Description sections of the datasheet.
What is the maximum SCLK frequency supported by MAX1242BCSA+T?
MAX1242BCSA+T supports SCLK frequencies up to 2.1MHz, as stated in the Timing Characteristics table (Rev 3, p.4). This allows full 10-bit data readout in under 5µs after conversion completion. The clock duty cycle is unrestricted provided each high/low phase remains ≥200ns - enabling flexible MCU timer or GPIO-driven clock generation without dedicated clock sources.
How does the SHDN pin function on MAX1242BCSA+T?
The SHDN pin on MAX1242BCSA+T is a three-level control: pulled low → 15µA shutdown mode; pulled high → internal 2.5V reference enabled; left open → internal reference disabled (allowing external reference use). This behavior is explicitly documented in the Pin Description section (p.7) and distinguishes MAX1242BCSA+T from MAX1243 variants that lack internal reference capability.
Is MAX1242BCSA+T pin-compatible with other devices in the MAX124x family?
Yes, MAX1242BCSA+T shares identical SO-8 pinout and signal mapping with MAX1240/MAX1241 (12-bit) and MAX1243 variants, as confirmed in the Pin Configuration diagram (p.6) and "Pin-Compatible 12-Bit Upgrades" feature bullet. However, firmware must accommodate differing bit widths and reference configurations - e.g., MAX1243 requires external VREF, while MAX1242BCSA+T uses internal VREF when SHDN is high.
MAX1242BCSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1242BCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1242BCSA+T 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+T reliable?
The price and inventory of MAX1242BCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1242BCSA+T is usually 5 days.
3.What payment methods are accepted for MAX1242BCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1242BCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1242BCSA+T?
MAX1242BCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1242BCSA+T 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+T?
For technical support, including MAX1242BCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1242BCSA+T requirements.
6.How does Aetrix verify that MAX1242BCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX1242BCSA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX1242BCSA+T?
All MAX1242BCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1242BCSA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX1242BCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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