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Analog Devices Inc./Maxim Integrated MAX1242BESA/V+T
- Part No.:
- MAX1242BESA/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1242BESA/V+T.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,745
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Product details
Overview
MAX1242BESA/V+T from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (SAR ADC) with internal 2.5V reference, 73ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It operates from a single +2.7V to +5.25V supply, features 1.5µs track/hold acquisition time, and delivers ±1 LSB INL over –40°C to +85°C in an 8-pin SO package. It is used in portable data loggers for battery-powered sensor digitization.
For engineers reviewing the MAX1242BESA/V+T datasheet, MAX1242BESA/V+T pinout, MAX1242BESA/V+T application, or MAX1242BESA/V+T equivalent, key selection criteria include internal reference accuracy (±30 ppm/°C), shutdown current (≤2 µA), unipolar 0V–VREF input range, and compatibility with microcontroller I/O ports without level-shifting.
Technical Context
The MAX1242BESA/V+T implements a capacitive SAR architecture with integrated track/hold and on-chip clock generation. Its conversion cycle completes in 7.5 µs, including 1.5 µs acquisition time, and supports external clock rates up to 2.1 MHz for serial data readout.
It uses a 2.5V internal reference trimmed to ±0.1% initial accuracy (2.470 V to 2.530 V at +25°C) and ±30 ppm/°C temperature coefficient. The SHDN pin enables three-level control: high (internal reference enabled), open (external reference mode), or low (shutdown ≤2 µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit unipolar output with no missing codes over temperature |
| Sampling Rate | 73 ksps maximum - supports real-time monitoring of fast transients |
| INL | ±1 LSB - ensures monotonicity and <0.1% full-scale error in precision measurement |
| Power Consumption | 3.0 mA at 73 ksps / 3.6 V (≈3.7 mW); 2 µA in shutdown - enables multi-year battery life |
| Reference | Internal 2.5 V ±0.1% (2.470–2.530 V), ±30 ppm/°C - eliminates external reference component cost and layout area |
| Small-Signal Bandwidth | 2.25 MHz - allows undersampling of signals beyond Nyquist rate |
| SINAD | 66 dB at 10 kHz - supports >10-bit effective resolution in noise-sensitive applications |
Pinout & Package
MAX1242BESA/V+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with gull-wing leads and standard JEDEC MO-153 footprint (S8+5 outline). Thermal resistance θJA = 170°C/W; max continuous power dissipation at +70°C is 471 mW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | +2.7V to +5.25V single supply; bypass with 0.1 µF ceramic capacitor near pin |
| 2 AIN | Analog input | 0V to VREF unipolar sampling node; input protection clamps to GND–0.3V / VDD+0.3V |
| 3 SHDN | Three-level shutdown control | High = enable internal reference; open = disable internal ref (external ref mode); low = shutdown ≤2 µA |
| 4 REF | Reference voltage terminal | 2.5V output (MAX1242 only); bypass with 4.7 µF tantalum for stability; supports external 1.0V–VDD references |
| 5 GND | Analog/digital ground | Single common ground plane required; separate AGND/DGND not supported |
| 6 DOUT | Serial data output | 3-wire SPI-compatible output; MSB-first, unipolar format; high-impedance when CS = high |
| 7 CS | Active-low chip select | Falling edge initiates conversion; rising edge disables DOUT; minimum pulse width 240 ns |
| 8 SCLK | Serial clock input | External clock up to 2.1 MHz; duty cycle unrestricted if ≥200 ns per phase; must be low during conversion |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates dual-rail supplies and simplifies power design in portable systems |
| Integrated track/hold | 1.5 µs acquisition time - reduces need for external sample-and-hold circuitry and saves board space |
| 3-wire serial interface | SPI/QSPI/MICROWIRE compatible - connects directly to standard MCU GPIO without protocol translation |
| Internal reference | 2.5V ±0.1%, ±30 ppm/°C - provides stable scaling without external reference IC or trimming resistors |
| Low-power shutdown | ≤2 µA supply current - extends battery life in intermittent-sampling applications like environmental sensors |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
|
Use Scenario: Battery-powered field sensor nodes logging temperature, pressure, and humidity at 10–100 Hz intervals. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; internal reference eliminates calibration drift across temperature. Use Value: 3.0 mA active current and 2 µA shutdown enable >5-year battery life in 1-minute wake-up cycles. |
Use Scenario: Industrial PLC analog input modules acquiring 4–20 mA loop signals in factory automation cabinets. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with ±1 LSB INL ensuring compliance with IEC 61000-4-5 surge immunity requirements. Use Value: 2.25 MHz small-signal bandwidth supports anti-alias filtering with simple RC networks, reducing BOM count. |
| Temperature Measurement | Isolated Data Acquisition |
|
Use Scenario: Thermistor or RTD-based medical thermometers requiring 0.1°C resolution over –20°C to +85°C. IC Role / Device Role / Timing Role: Precision 10-bit digitizer with internal 2.5V reference; calibrated offset/gain correction applied in firmware. Use Value: ±1 LSB INL and 66 dB SINAD ensure <0.05% full-scale error after two-point calibration. |
Use Scenario: Isolated sensor interfaces using digital isolators (e.g., ADuM140x) between ADC and host MCU. IC Role / Device Role / Timing Role: Low EMI 3-wire serial ADC minimizing coupling into isolation barriers; no external clock required for conversion timing. Use Value: Internal clock and 7.5 µs fixed conversion time simplify timing budget across isolation boundary. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1243BESA+ | No internal reference; requires external 1.0V–VDD reference; same pinout, timing, and package | Better suited for systems with shared precision reference rail; higher flexibility in reference voltage selection | Select MAX1243BESA+ when reference sharing or adjustable full-scale range (e.g., 1.0V–2.5V) is required |
| ADS7822U | TI 12-bit SAR ADC; 200 ksps; 2.7V–5.25V supply; SPI interface; no internal reference; 8-pin SOIC | Higher resolution but higher power (1.2 mA @ 200 ksps); lacks integrated track/hold and internal reference | Select ADS7822U only when 12-bit resolution is mandatory and external reference + external track/hold are acceptable |
Compared with MAX1242BESA/V+T, MAX1243BESA+ removes internal reference dependency at the cost of added BOM and layout complexity, while ADS7822U trades off power efficiency and integration for extra bits-neither offers drop-in replacement capability due to differing reference architecture and timing behavior.
Availability
MAX1242BESA/V+T is available at Aetrix Electronics and suitable for portable data logging, process control monitoring, and temperature measurement applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX1242BESA/V+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 industrial, medical, and communications markets.
The MAX1242/MAX1243 product line targets ultra-low-power, space-constrained data acquisition systems where integration of reference, track/hold, and serial interface reduces system-level component count and improves reliability.
FAQ
What is the operating temperature range for MAX1242BESA/V+T?
The MAX1242BESA/V+T is specified for operation from –40°C to +85°C. This extended temperature grade is confirmed in the Ordering Information table (MAX1242BESA+), and all electrical characteristics-including INL (±1 LSB), reference voltage (2.470 V to 2.530 V), and supply current-are guaranteed across this full range.
Does MAX1242BESA/V+T require an external reference capacitor?
Yes, MAX1242BESA/V+T requires a 4.7 µF capacitor at the REF pin when using the internal 2.5V reference. This is explicitly specified in the Electrical Characteristics table and Functional Diagram. Omitting it degrades reference stability and increases INL error beyond ±1 LSB.
Can MAX1242BESA/V+T interface directly with an Arduino or STM32 MCU?
Yes, MAX1242BESA/V+T interfaces directly with Arduino and STM32 MCUs via its 3-wire SPI-compatible interface. It requires only CS, SCLK, and DOUT connections; CPOL = 0 and CPHA = 0 configuration is supported, and no level shifting is needed for 3.3V or 5V I/O domains.
What is the minimum acquisition time for MAX1242BESA/V+T?
The minimum acquisition time for MAX1242BESA/V+T is 1.5 µs, as specified in the Timing Characteristics table under "Acquisition Time (tACQ)". This value is guaranteed across supply voltage (2.7V–5.25V) and temperature (–40°C to +85°C) ranges.
How does the SHDN pin function on MAX1242BESA/V+T?
On MAX1242BESA/V+T, the SHDN pin operates in three states: pulled high enables the internal 2.5V reference; left open disables the internal reference (allowing external reference use); pulled low places the device in shutdown mode with ≤2 µA supply current. This behavior is documented in the Pin Description and Detailed Description sections.
MAX1242BESA/V+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:
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1242BESA/V+T FAQ
1.How can I place an order for MAX1242BESA/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1242BESA/V+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/V+T reliable?
The price and inventory of MAX1242BESA/V+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/V+T is usually 5 days.
3.What payment methods are accepted for MAX1242BESA/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1242BESA/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1242BESA/V+T?
MAX1242BESA/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1242BESA/V+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/V+T?
For technical support, including MAX1242BESA/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1242BESA/V+T requirements.
6.How does Aetrix verify that MAX1242BESA/V+T is sourced from the original manufacturer or authorized distributors?
All MAX1242BESA/V+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/V+T meets industry standards.
7.What is the process for return or replacement of MAX1242BESA/V+T?
All MAX1242BESA/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1242BESA/V+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/V+T part is unused and in its original packaging.
Return procedure for MAX1242BESA/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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