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Analog Devices Inc./Maxim Integrated MAX1242AESA+
- Part No.:
- MAX1242AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1242AESA+.pdf
- Description:
- IC ADC 10BIT SERIAL 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,363
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Product details
Overview
MAX1242AESA+ from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (SAR 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 acquisition at ≤3.7mW (VDD = 3V).
For engineers reviewing the MAX1242AESA+ datasheet, MAX1242AESA+ pinout, MAX1242AESA+ application, or MAX1242AESA+ equivalent, this page delivers verified electrical specs, SO-8 package mapping, real-world use cases in isolated data acquisition and portable logging, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The MAX1242AESA+ implements a track/hold + SAR architecture with on-chip clock generation and unipolar binary output coding. Its internal 2.5V reference is trimmed to ±0.25LSB INL over temperature and enabled by pulling SHDN high; REF pin is bypassed with 4.7µF for stability.
Conversion is initiated by CS falling edge; DOUT signals end-of-conversion (EOC) with rising edge, then shifts out 10 data bits (MSB-first), 1 EOC bit, and 2 sub-bits. Timing supports fSCLK up to 2.1MHz with unrestricted duty cycle (≥200ns per phase), and acquisition time tACQ is fixed at 1.5µs minimum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete codes across full-scale range, enabling 2.44mV LSB step size at 2.5V reference. |
| Sampling Rate | 73ksps maximum - supports real-time capture of signals up to ~36.5kHz Nyquist bandwidth without aliasing. |
| Reference | Internal 2.5V ±0.3% (25°C), ±30ppm/°C TC - eliminates external reference component count and layout area for self-contained designs. |
| Power Consumption | 3.7mW at 73ksps (VDD = 3V), 5µW shutdown - enables battery-powered operation for >1 year in intermittent-sampling systems. |
| INL / DNL | ±0.5LSB typical INL, ±1LSB max DNL - ensures monotonicity and <0.05% full-scale linearity error after calibration. |
| SINAD / SFDR | 66dB SINAD, 70dB SFDR (10kHz input) - supports accurate digitization of medium-bandwidth sensor signals with low harmonic distortion. |
| Supply Range | +2.7V to +5.25V single supply - interoperates with 3.3V and 5V logic domains without level-shifting circuitry. |
Pinout & Package
MAX1242AESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with gull-wing leads and standard JEDEC MS-012AC footprint (outline 21-0041). Thermal resistance θJA = 170°C/W; max continuous power dissipation at +70°C is 471mW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog core, digital interface, and internal reference buffer. |
| 2 AIN | Analog input | Unipolar 0V to VREF sampling node; input protection clamps ±0.3V beyond rails; 16pF input capacitance. |
| 3 SHDN | Three-level shutdown control | Pull low → 15µA shutdown; leave open → internal reference disabled; pull high → internal reference enabled (MAX1242 only). |
| 4 REF | Reference voltage terminal | Outputs 2.5V (MAX1242); requires 4.7µF bypass capacitor; supports external reference 1.0V–VDD when internal ref disabled. |
| 5 GND | Analog/digital common ground | Single ground pin shared by analog and digital sections; requires low-impedance PCB connection to minimize noise coupling. |
| 6 DOUT | Serial data output | 3-wire interface output; high-impedance when CS = high; transitions on SCLK falling edge; outputs EOC bit first. |
| 7 CS | Active-low chip select | Falling edge initiates conversion and enables DOUT; rising edge disables DOUT and resets interface timing. |
| 8 SCLK | Serial clock input | Asynchronous clock up to 2.1MHz; controls data shift-out timing; must remain low during conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Factory-trimmed ±0.25LSB INL over -40°C to +85°C; eliminates need for external reference IC and associated passive components. |
| Low-power shutdown mode | Reduces supply current to ≤15µA (VDD ≤3.6V); wake-up time depends on REF capacitor discharge but supports burst-mode sensing. |
| Track/hold acquisition time | Fixed 1.5µs acquisition window - enables deterministic timing budgeting and simplifies synchronization with microcontroller GPIO polling. |
| SPI/QSPI/MICROWIRE compatibility | Direct connection to standard MCU serial peripherals with CPOL=0/CPHA=0; no protocol translation or glue logic required. |
| Small SO-8 footprint | 5mm × 4mm body, 1.27mm pitch - fits dense PCB layouts in handheld instruments and IoT sensor modules. |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10s intervals. IC Role / Device Role / Timing Role: Primary analog front-end ADC acquiring conditioned sensor outputs with minimal power overhead between samples. Use Value: 5µW shutdown current extends 2xAA battery life to >2 years; internal reference removes calibration drift from external components. |
Use Scenario: Industrial PLC analog input module measuring 4–20mA loop signals across 16 channels. IC Role / Device Role / Timing Role: Channel-specific precision ADC providing 10-bit resolution for feedback control loops with <100µs latency. Use Value: 73ksps throughput allows oversampling to improve effective resolution; SO-8 package enables compact multi-channel layout. |
| Isolated Data Acquisition | Temperature Measurement |
|
Use Scenario: Medical patient monitor isolating ECG/EEG signals using optocoupled or capacitive isolation barriers. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing amplified biopotential signals before transmission across barrier. Use Value: Low 16pF input capacitance minimizes loading on high-impedance sensor amplifiers; 66dB SINAD preserves signal fidelity. |
Use Scenario: Smart thermostat using thermistor or RTD with ratiometric measurement against internal 2.5V reference. IC Role / Device Role / Timing Role: Precision ADC converting bridge or divider output with built-in stable reference for ratio-metric accuracy. Use Value: ±30ppm/°C reference TC ensures <0.1°C absolute error over -40°C to +85°C operating range. |
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 |
|---|---|---|---|
| MAX1243AESA+ | No internal reference; requires external 1.0V–VDD reference; lower 3mW active power at 73ksps (VDD = 3V). | Better suited for systems where reference voltage is shared across multiple converters or derived from precision DAC. | Select MAX1243AESA+ when reference flexibility, lower active power, or multi-ADC reference sharing is prioritized over integration. |
| ADS7822U | TI 10-bit SAR ADC; 200ksps max; 2.7V–5.25V supply; SPI-only interface; no internal reference; 1.5µs acquisition. | Higher speed and tighter AC specs (70dB SINAD), but lacks internal reference and requires external clock management. | Choose ADS7822U for higher throughput or improved dynamic performance where external reference and clock routing are acceptable. |
Compared with MAX1242AESA+, MAX1243AESA+ trades integrated reference for greater reference flexibility and slightly lower active power, while ADS7822U offers higher speed and dynamic performance at the cost of increased system design complexity and missing on-chip reference.
Availability
MAX1242AESA+ is available at Aetrix Electronics and suitable for portable data logging, isolated data acquisition, and temperature measurement requiring stable component supply across industrial and medical OEM programs.
Supply support for MAX1242AESA+ 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 high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX1242/MAX1243 family was designed for ultra-low-power, space-constrained data acquisition systems needing integrated reference and simple 3-wire interfacing - targeting battery-operated sensors and distributed monitoring nodes.
FAQ
What is the operating temperature range of the MAX1242AESA+?
The MAX1242AESA+ is rated for -40°C to +85°C ambient operation, matching the "E" grade specification in the ordering table. This extended temperature range ensures reliable performance in industrial environments, outdoor sensor enclosures, and automotive under-hood applications where thermal stress is present. All key parameters - including INL (±0.5LSB), reference stability (±30ppm/°C), and supply current - are guaranteed across this full range.
Does the MAX1242AESA+ require an external reference capacitor?
Yes, the MAX1242AESA+ requires a 4.7µF capacitor connected from REF to GND to stabilize its internal 2.5V reference. This capacitor is mandatory for achieving specified DC accuracy (±0.5LSB INL) and low-noise operation. The datasheet explicitly states that omitting or undersizing this capacitor degrades reference regulation, increases output noise, and causes long wake-up delays after shutdown - all confirmed in Figures 6 and 7 of the official datasheet.
How does the SHDN pin function on the MAX1242AESA+?
The SHDN pin on the MAX1242AESA+ operates in three states: pulled low → device enters shutdown (<15µA current); left open → internal reference disabled (enabling external reference use); pulled high → internal reference enabled and full operation. This three-level control is unique to the MAX1242 variant and directly affects reference configuration - unlike the MAX1243, which always uses external reference regardless of SHDN state.
Can the MAX1242AESA+ interface directly with an STM32 microcontroller's SPI peripheral?
Yes, the MAX1242AESA+ interfaces directly with STM32 SPI peripherals when configured with CPOL = 0 and CPHA = 0. Its DOUT pin outputs MSB-first data synchronized to SCLK falling edges, matching standard SPI timing. The CS pin serves as slave-select, and no additional level-shifting or protocol translation is needed - confirmed by Figure 11a (SPI connection) and timing diagrams in the datasheet.
What is the maximum clock frequency supported by the MAX1242AESA+ serial interface?
The MAX1242AESA+ supports a maximum SCLK frequency of 2.1MHz, with no restriction on duty cycle as long as each high/low phase is ≥200ns. This limit is specified in the Electrical Characteristics table under "SCLK Clock Frequency" and validated across temperature and supply voltage ranges. Exceeding 2.1MHz risks setup/hold violations and invalid data reads, particularly at temperature extremes.
MAX1242AESA+ 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:
- -
MAX1242AESA+ FAQ
1.How can I place an order for MAX1242AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1242AESA+ 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 MAX1242AESA+ reliable?
The price and inventory of MAX1242AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1242AESA+ is usually 5 days.
3.What payment methods are accepted for MAX1242AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1242AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1242AESA+?
MAX1242AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1242AESA+ 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 MAX1242AESA+?
For technical support, including MAX1242AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1242AESA+ requirements.
6.How does Aetrix verify that MAX1242AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1242AESA+ 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 MAX1242AESA+ meets industry standards.
7.What is the process for return or replacement of MAX1242AESA+?
All MAX1242AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1242AESA+, 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 MAX1242AESA+ part is unused and in its original packaging.
Return procedure for MAX1242AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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