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Analog Devices Inc./Maxim Integrated MAX1242BESA+T
- Part No.:
- MAX1242BESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1242BESA+T.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,067
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Product details
Overview
MAX1242BESA+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 - designed for space-constrained remote sensor nodes requiring precision analog digitization at ≤3.6V supply.
For engineers reviewing the MAX1242BESA+T datasheet, MAX1242BESA+T pinout, MAX1242BESA+T application, or MAX1242BESA+T equivalent, this page delivers verified electrical specs, SO-8 package mapping, real-world timing behavior, functional differences vs. MAX1243 variants, and validated alternatives for portable data logging, isolated acquisition, and battery-powered process monitoring.
Technical Context
The MAX1242BESA+T implements a track/hold + SAR architecture with on-chip clock generation and unipolar serial output format (EOC bit + 10 data bits + 2 sub-bits). Its internal 2.5V reference is enabled by pulling SHDN high and trimmed to ±0.25 LSB INL over –40°C to +85°C.
It operates from a single +2.7V to +5.25V supply, consumes 3mW at 73ksps (VDD = 3V), and enters 2µA shutdown mode when SHDN is pulled low - with wake-up delay dependent on external 4.7µF REF bypass capacitor discharge time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes across full-scale input range |
| Sampling Rate | 73ksps - supports real-time capture of signals up to ~36.5kHz Nyquist bandwidth |
| Reference | Internal 2.5V (±30ppm/°C drift) - eliminates need for external reference IC in cost-sensitive designs |
| Power Consumption | 3mW @ 73ksps, VDD = 3V - enables >100hr operation on coin-cell batteries in periodic-sampling systems |
| INL | ±1 LSB - ensures monotonicity and <0.1% full-scale linearity error without calibration |
| Aperture Jitter | <50ps - preserves SNR in undersampling applications up to 2.25MHz small-signal bandwidth |
| Supply Range | +2.7V to +5.25V - interoperable with 3.3V and 5V logic domains and mixed-voltage PCBs |
Pinout & Package
MAX1242BESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with gull-wing leads and standard JEDEC MS-012AC footprint (package code S8+5, outline 21-0041).
| 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 control input | Pull low → 2µA shutdown; pull high → enable internal 2.5V ref; open → disable ref for external use |
| REF (Pin 4) | Reference terminal | 2.5V output (MAX1242) or 1.0V–VDD input (MAX1243); requires 4.7µF bypass for internal ref stability |
| GND (Pin 5) | Analog/digital common ground | Single ground pin shared by analog and digital sections; critical for noise isolation |
| 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 | Accepts up to 2.1MHz clock; duty cycle unrestricted if ≥200ns per phase |
| DOUT (Pin 6) | Serial data output | MSB-first unipolar stream (EOC + 10 bits + 2 sub-bits); transitions on SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates dual-rail supplies and level shifters in portable systems |
| On-chip track/hold | 1.5µs acquisition time - enables accurate sampling of fast transients without external TH circuitry |
| 3-wire serial interface | SPI/QSPI/MICROWIRE compatible - directly connects to standard microcontroller I/O ports with no glue logic |
| Internal voltage reference | 2.5V ±0.25 LSB INL over –40°C to +85°C - reduces BOM count and layout area vs. external reference solutions |
| Low-power shutdown | 2µA max supply current - extends battery life in intermittent-sampling applications such as environmental sensors |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
Use Scenario: Battery-powered temperature/humidity logger recording every 10 seconds in field-deployed enclosures. IC Role / Device Role / Timing Role: ADC digitizes conditioned sensor outputs; internal reference ensures stable scaling across temperature swings. Use Value: 3mW active power + 2µA shutdown enables multi-year operation on CR2032; SO-8 footprint fits compact PCBs. |
Use Scenario: DIN-rail mounted PLC module measuring 4–20mA loop signals via precision shunt resistors. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with ±1 LSB INL maintains traceability in industrial calibration workflows. Use Value: 73ksps throughput supports oversampling for noise reduction; 2.25MHz input bandwidth captures transient faults. |
| Isolated Data Acquisition | Temperature Measurement |
Use Scenario: Medical patient monitor acquiring ECG/SpO₂ signals across reinforced isolation barrier using digital isolators. IC Role / Device Role / Timing Role: Low-noise, low-power ADC placed on isolated side; 3-wire interface minimizes isolator channel count. Use Value: Single 3.3V supply simplifies isolated power design; high-Z DOUT during CS high prevents backfeeding into isolators. |
Use Scenario: Thermistor-based oven controller requiring 0.1°C resolution over –20°C to +150°C range. IC Role / Device Role / Timing Role: Digitizes ratiometric thermistor divider; internal 2.5V reference eliminates ratio error from supply variation. Use Value: ±1 LSB INL and ±30ppm/°C ref drift ensure <0.2°C absolute accuracy without factory calibration. |
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 |
|---|---|---|---|
| MAX1243BESA+ | Requires external reference (1.0V–VDD); no internal 2.5V ref; identical SO-8 pinout and timing | Better suited when system already provides precision external reference or needs flexible full-scale adjustment | Select MAX1243BESA+ only if external reference improves overall system accuracy or enables programmable gain |
| ADS7822U | TI 10-bit SAR ADC; 200ksps; 2.7V–5.25V; SPI-only interface; no internal reference; 8-pin SOIC | Lacks integrated reference and shutdown control; higher speed but higher power (1.2mW @ 200ksps) | Choose ADS7822U only when maximum throughput >100ksps is required and external reference is available |
Compared with MAX1242BESA+T, MAX1243BESA+ trades internal reference convenience for external reference flexibility, while ADS7822U offers higher speed at the cost of added BOM complexity and loss of integrated shutdown - making MAX1242BESA+T optimal for ultra-low-power, self-contained sensing nodes.
Availability
MAX1242BESA+T is available at Aetrix Electronics and suitable for portable data logging, isolated data acquisition, and temperature measurement requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long-term production continuity.
Supply support for MAX1242BESA+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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for industrial, medical, and communications systems.
The MAX1242/MAX1243 family was engineered for ultra-low-power, space-constrained data acquisition - delivering 10-bit accuracy with integrated reference and minimal external components in SO-8 and PDIP packages.
FAQ
What is the operating temperature range of the MAX1242BESA+T?
The MAX1242BESA+T is rated for –40°C to +85°C industrial temperature range, with guaranteed ±1 LSB integral nonlinearity and 2.5V reference stability across this span. This makes MAX1242BESA+T suitable for deployment in harsh environments such as factory floors, outdoor instrumentation, and automotive under-hood modules where ambient temperatures exceed commercial grade limits.
Does the MAX1242BESA+T require an external reference capacitor?
Yes - the MAX1242BESA+T 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. Without it, reference noise increases and INL degrades beyond ±1 LSB. The capacitor must be placed close to the REF pin with low-ESR characteristics.
How does the SHDN pin function on the MAX1242BESA+T?
The SHDN pin on MAX1242BESA+T is a three-level control: pulled low → 2µA shutdown mode; pulled high → enables internal 2.5V reference; left open → disables internal reference for external reference use. This dual-role functionality allows MAX1242BESA+T to operate either as a self-contained ADC or as a reference-flexible variant without changing PCB layout.
Can the MAX1242BESA+T interface directly with an SPI host controller?
Yes - the MAX1242BESA+T is fully compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0. It uses CS, SCLK, and DOUT lines only, requiring no MOSI line since it is output-only. The host reads 12-bit serial frames (EOC + 10 data bits + 2 sub-bits) with MSB-first timing aligned to SCLK falling edges.
What is the maximum clock frequency supported by the MAX1242BESA+T serial interface?
The MAX1242BESA+T supports a maximum SCLK frequency of 2.1MHz, with no restriction on duty cycle as long as each clock phase remains ≥200ns. This allows flexible clock generation from microcontrollers or FPGA peripherals. Note that SCLK must remain low during conversion - clocking during tCONV may corrupt the result.
MAX1242BESA+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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1242BESA+T FAQ
1.How can I place an order for MAX1242BESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1242BESA+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 MAX1242BESA+T reliable?
The price and inventory of MAX1242BESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1242BESA+T is usually 5 days.
3.What payment methods are accepted for MAX1242BESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1242BESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1242BESA+T?
MAX1242BESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1242BESA+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 MAX1242BESA+T?
For technical support, including MAX1242BESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1242BESA+T requirements.
6.How does Aetrix verify that MAX1242BESA+T is sourced from the original manufacturer or authorized distributors?
All MAX1242BESA+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 MAX1242BESA+T meets industry standards.
7.What is the process for return or replacement of MAX1242BESA+T?
All MAX1242BESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1242BESA+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 MAX1242BESA+T part is unused and in its original packaging.
Return procedure for MAX1242BESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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