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Analog Devices Inc./Maxim Integrated MAX1242BESA+
- Part No.:
- MAX1242BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1242BESA+.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MAX1242BESA+ 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. It operates from a single +2.7V to +5.25V supply in an 8-pin SO package and is used in portable data logging and isolated sensor interfaces where space and power are constrained.
For engineers reviewing the MAX1242BESA+ datasheet, MAX1242BESA+ pinout, MAX1242BESA+ application, or MAX1242BESA+ equivalent, this page delivers verified technical identity, exact SO-8 pin mapping, confirmed DC/AC performance specs (INL ±1 LSB, SINAD 66dB), real-world timing behavior (tACQ = 1.5µs, tCONV = 7.5µs), and two validated alternative parts for design flexibility.
Technical Context
The MAX1242BESA+ integrates a track/hold amplifier, 10-bit SAR core, on-chip 2.5V reference (enabled when SHDN = high), and unidirectional 3-wire serial interface. Its acquisition time (1.5µs) and conversion time (7.5µs) are fixed by internal clocking, independent of external SCLK during conversion.
It uses a capacitive DAC architecture with 16pF hold capacitor and 9kΩ input resistance; input bandwidth is 2.25MHz small-signal, supporting undersampling applications. Reference output drives up to 400µA and requires 4.7µF bypass capacitance for stable operation after shutdown wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes over full-scale range |
| Throughput Rate | 73ksps - supports real-time sampling of signals up to ~36.5kHz Nyquist bandwidth |
| Integral Nonlinearity | ±1 LSB - ensures monotonicity and <0.1% end-point linearity error across temperature |
| Signal-to-Noise + Distortion | 66 dB - enables >10-bit effective resolution for clean signal digitization |
| Supply Current (Active) | 3.0 mA at VDD = 3.6V - draws only 3mW at 3V, enabling battery-powered operation |
| Shutdown Current | 2 µA - reduces average power to µW-level between conversions |
| Reference Voltage | 2.500 V ±30 ppm/°C - factory-trimmed internal reference with ±0.3% initial accuracy |
Pinout & Package
MAX1242BESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with gull-wing leads and standard JEDEC MS-012AC outline (S8+5). Thermal pad not present; substrate connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog/digital sections and internal reference |
| 2 AIN | Analog input | Unipolar 0V to VREF sampling node; protected to GND −0.3V / VDD +0.3V |
| 3 SHDN | Three-level shutdown control | High = enable internal reference; open = disable internal ref (allow external); low = 2µA shutdown |
| 4 REF | Reference voltage terminal | 2.5V output (MAX1242) or 1.0V–VDD input (external ref mode); requires 4.7µF bypass cap |
| 5 GND | Analog and digital ground | Single common return; must be low-impedance connection to minimize noise coupling |
| 6 DOUT | Serial data output | 3-wire unidirectional output; high-Z when CS = high; data valid on SCLK falling edge |
| 7 CS | Chip select | Active-low conversion trigger; falling edge initiates T/H hold and conversion sequence |
| 8 SCLK | Serial clock input | Asynchronous read clock (≤2.1MHz); no duty-cycle restriction if ≥200ns per phase |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates need for dual-rail or charge-pump supplies in portable systems |
| Internal 2.5V reference | Trimmed ±0.3%, 30 ppm/°C drift - removes external reference component and layout complexity |
| Low-power shutdown | 2 µA max current - enables microamp-level system sleep modes without external power gating |
| SPI/QSPI/MICROWIRE compatibility | No protocol translation required - connects directly to standard MCU serial peripheral pins |
| Track/hold acquisition time | 1.5 µs - supports sampling of fast transients without external sample-hold circuitry |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure over extended periods. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs at 1–10ksps; internal reference ensures consistent scaling across temperature. Use Value: 3mW active power and 2µA shutdown extend battery life to months; SO-8 footprint saves PCB area in compact enclosures. |
Use Scenario: Industrial PLC analog input module acquiring 4–20mA loop signals from field transmitters. IC Role / Device Role / Timing Role: Precision front-end ADC with ±1 LSB INL provides accurate 10-bit representation of process variables. Use Value: 66dB SINAD and 2.25MHz input bandwidth support anti-alias filtering and reject high-frequency noise in electrically noisy plants. |
| Temperature Measurement | Isolated Data Acquisition |
Use Scenario: Thermistor or RTD-based temperature monitor in medical or HVAC equipment. IC Role / Device Role / Timing Role: Converts ratiometric or bridge-derived voltage into calibrated digital value using stable 2.5V internal reference. Use Value: ±30 ppm/°C reference drift minimizes calibration drift; 1.5µs acquisition allows rapid scanning across multiple channels. |
Use Scenario: High-voltage isolation barrier capturing sensor data across galvanic separation (e.g., IGBT gate monitoring). IC Role / Device Role / Timing Role: Low EMI 3-wire serial interface simplifies optocoupler or digital isolator implementation on isolated side. Use Value: Unidirectional DOUT and CS-controlled timing eliminate bidirectional signal crossing isolation boundary. |
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 and interface; higher 115ksps throughput | Requires higher precision measurement (e.g., 0.025% FS accuracy); consumes ~4.5mA active current | Select when resolution >10 bits is mandatory and additional LSBs justify higher cost and power |
| ADS7822U | 12-bit, 200ksps, 2.7–5.25V supply, SPI-compatible, but uses external reference only and no internal ref option | Designed for higher-speed industrial DAQ; lacks integrated reference, requiring external 2.5V source | Choose when faster sampling is needed and reference sourcing is already available on board |
Compared with MAX1242BESA+, MAX1240BCSA+ offers 2 extra bits and faster throughput but increases power and cost; ADS7822U trades internal reference convenience for speed and resolution, demanding external reference design effort.
Availability
MAX1242BESA+ is available at Aetrix Electronics and suitable for portable data logging, process control monitoring, and temperature measurement requiring stable component supply across industrial temperature ranges (−40°C to +85°C).
Supply support for MAX1242BESA+ 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 applications.
The MAX1242 series targets low-power, space-constrained data acquisition systems requiring integrated reference and simple serial interfacing - optimized for remote sensors and battery-operated instrumentation.
FAQ
What is the operating temperature range of the MAX1242BESA+?
The MAX1242BESA+ is rated for −40°C to +85°C industrial temperature operation. This is confirmed in the Ordering Information table (page 12), where "BESA+" explicitly maps to the −40°C to +85°C range and 8-pin SO package. The device maintains specified INL (±1 LSB), gain error, and reference stability across this full range.
Does the MAX1242BESA+ require an external reference capacitor?
Yes - the MAX1242BESA+ requires a 4.7µF capacitor at the REF pin when using its internal 2.5V reference. This is mandated in the Functional Diagram note, Electrical Characteristics table, and Detailed Description section. Omitting it causes reference instability and degraded DC accuracy, especially after shutdown wake-up.
How does the SHDN pin function on the MAX1242BESA+?
On the MAX1242BESA+, SHDN is a three-level control: pulled high enables the internal 2.5V reference; left open disables the internal reference (allowing external reference use); pulled low places the device in 2µA shutdown mode. This behavior is documented in the Pin Description (page 6) and Detailed Description (page 7).
What is the maximum SCLK frequency supported by the MAX1242BESA+?
The MAX1242BESA+ supports SCLK frequencies up to 2.1MHz, as specified in the Timing Characteristics table (page 4). The clock duty cycle is unrestricted provided each high/low phase is ≥200ns. Clocking above 2.1MHz risks data corruption or incomplete bit transfer during serial readout.
Is the MAX1242BESA+ pin-compatible with the MAX1243BESA+?
No - while both share the same SO-8 package and pinout, the MAX1242BESA+ and MAX1243BESA+ differ functionally at the REF and SHDN pins: MAX1242BESA+ sources 2.5V from REF and uses SHDN to enable/disable that reference; MAX1243BESA+ expects external VREF on REF and uses SHDN only for shutdown. Swapping them without circuit changes causes reference failure.
MAX1242BESA+ 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1242BESA+ FAQ
1.How can I place an order for MAX1242BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1242BESA+ 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+ reliable?
The price and inventory of MAX1242BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1242BESA+ is usually 5 days.
3.What payment methods are accepted for MAX1242BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1242BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1242BESA+?
MAX1242BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1242BESA+ 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+?
For technical support, including MAX1242BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1242BESA+ requirements.
6.How does Aetrix verify that MAX1242BESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1242BESA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1242BESA+?
All MAX1242BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1242BESA+, 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+ part is unused and in its original packaging.
Return procedure for MAX1242BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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