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Analog Devices Inc./Maxim Integrated MAX1242BCSA-TG068
- Part No.:
- MAX1242BCSA-TG068
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1242BCSA-TG068.pdf
- Description:
- LOW-POWER, 10-BIT SERIAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MAX1242BCSA-TG068 from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (SAR ADC) with internal 2.5V reference, single +2.7V to +5.25V supply operation, 73ksps throughput, and SPI/QSPI/Microwire-compatible 3-wire serial interface. It features 1.5µs track/hold acquisition, 7.5µs conversion time, and 2µA shutdown current - optimized for portable data logging and isolated sensor interfaces.
For engineers reviewing the MAX1242BCSA-TG068 datasheet, MAX1242BCSA-TG068 pinout, MAX1242BCSA-TG068 application, or MAX1242BCSA-TG068 equivalent, this page delivers verified electrical specs, SO-8 package mapping, functional pin roles, real-world use cases in remote sensing, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX1242BCSA-TG068 implements a capacitive SAR architecture with integrated track/hold and on-chip 2.5V reference trimmed to ±0.25% initial accuracy. Its unipolar transfer function digitizes inputs from 0V to VREF (2.5V), delivering 10-bit resolution with ±1 LSB INL and ±1 LSB DNL over 0°C to +70°C.
Conversion is initiated by CS falling edge; EOC is signaled by DOUT high transition after 7.5µs. Data is clocked out MSB-first on SCLK falling edge, requiring ≥13 clock cycles for full 10-bit result plus leading EOC bit and two sub-bits - fully compatible with standard microcontroller SPI master mode (CPOL=0, CPHA=0).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete output codes for precision measurement of analog sensor signals. |
| Sampling Rate | 73ksps maximum - supports real-time monitoring of fast transients in process control and test equipment. |
| Reference | Internal 2.5V ±0.25% - eliminates external reference component count and simplifies BOM for compact designs. |
| Power Consumption | 3.7mW at 73ksps (VDD = 3V) - enables battery-powered operation for >1 year in low-duty-cycle data loggers. |
| Track/Hold Acquisition | 1.5µs typical - ensures accurate sampling of signals up to 2.25MHz small-signal bandwidth without external buffering. |
| Interface Protocol | SPI/QSPI/Microwire 3-wire serial - connects directly to GPIO pins of ARM Cortex-M, PIC, or MSP430 MCUs without level shifters. |
| INL / DNL | ±1 LSB max - guarantees monotonicity and <0.1% full-scale error after calibration, critical for closed-loop control feedback. |
Pinout & Package
MAX1242BCSA-TG068 is housed in an 8-pin SOIC (SO-8) surface-mount package, 3.9mm × 4.9mm footprint, 1.27mm pitch, JEDEC MS-012AC compliant. Pin 1 marked via notch or dot; thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog core, reference, and digital interface - bypass with 0.1µF ceramic near pin. |
| 2 AIN | Analog input | Unipolar input range 0V to VREF (2.5V); protected to GND−0.3V / VDD+0.3V; source impedance ≤4kΩ for full AC performance. |
| 3 SHDN | Three-level shutdown control | Pull low → 2µA shutdown; float → internal reference disabled; pull high → internal reference enabled and active. |
| 4 REF | Reference voltage terminal | Outputs 2.5V (MAX1242 only); bypass with 4.7µF tantalum for stability; supplies internal DAC and may drive external circuitry (≤400µA). |
| 5 GND | Analog/digital ground | Single ground plane required; tie to system AGND at single point to minimize noise coupling into ADC core. |
| 6 DOUT | Serial data output | 3-state, MSB-first output; transitions on SCLK falling edge; high-Z when CS = high - compatible with SPI MISO. |
| 7 CS | Active-low chip select | Falling edge initiates conversion and holds T/H; rising edge disables DOUT; minimum pulse width 240ns. |
| 8 SCLK | Serial clock input | Accepts up to 2.1MHz clock; duty cycle unrestricted if each phase ≥200ns; must remain low during conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates dual-rail power design complexity and reduces bill-of-materials in portable systems. |
| Integrated track/hold | 1.5µs acquisition time - removes need for external sample-and-hold IC, saving PCB area and signal path error sources. |
| Low-power shutdown | 2µA max supply current - extends battery life in intermittent-sampling applications like environmental sensors. |
| On-chip 2.5V reference | ±30ppm/°C tempco, ±0.25% initial accuracy - provides stable scaling without external precision reference IC or resistor network. |
| 3-wire serial interface | No MISO/MOSI direction control needed - uses only CS, SCLK, DOUT; simplifies firmware and reduces MCU pin count. |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity node recording data every 10 seconds in remote industrial sites. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs; internal reference ensures consistent scaling across temperature drift. Use Value: 3.7mW active power + 2µA shutdown enables >2-year battery life; SO-8 package fits compact enclosure with minimal layout area. |
Use Scenario: PLC analog input module measuring 4–20mA loop signals from pressure and flow transmitters. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with 10-bit resolution and ±1 LSB linearity for calibrated measurement. Use Value: Internal 2.5V reference eliminates external reference drift errors; 73ksps supports oversampling for noise reduction in noisy factory environments. |
| Test Equipment | Isolated Data Acquisition |
|
Use Scenario: Handheld multimeter capturing transient voltage spikes and RMS values in field service tools. IC Role / Device Role / Timing Role: Fast-conversion ADC with 7.5µs tCONV and 1.5µs tACQ enabling precise timing of short-duration events. Use Value: 2.25MHz small-signal bandwidth allows undersampling of kHz-range signals; SPI interface simplifies integration with display MCU. |
Use Scenario: Medical patient monitor acquiring biopotential signals (ECG, EEG) across galvanically isolated barrier. IC Role / Device Role / Timing Role: Isolated-side ADC converting analog front-end outputs; low EMI 3-wire interface minimizes coupling across isolation barrier. Use Value: Single-supply +3.3V operation matches isolated DC-DC output; 10-bit resolution meets IEC 60601-2-27 dynamic range requirements. |
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 |
|---|---|---|---|
| MAX1243BCSA | No internal reference; requires external 1.0V–VDD reference; lower 3mW active power at 73ksps. | Better suited when system already provides precision reference (e.g., bandgap or REF5025); avoids reference conflict in multi-ADC systems. | Select MAX1243BCSA if external reference is available and board space allows separate reference decoupling. |
| ADS7822U | TI 10-bit SAR ADC; 200ksps max; +2.7V–+5.25V; SPI interface; no internal reference; 1.5µs acquisition. | Higher speed but lacks integrated reference; requires external 2.5V reference and additional decoupling; different pinout (SO-8 but non-compatible). | Choose ADS7822U only when >100ksps sampling is required and reference sourcing is handled externally. |
Compared with MAX1242BCSA-TG068, MAX1243BCSA removes internal reference dependency for greater flexibility in reference architecture, while ADS7822U trades integrated reference for higher speed - neither offers pin compatibility, so PCB redesign is required for either alternative.
Availability
MAX1242BCSA-TG068 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and medical data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1242BCSA-TG068 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX1242/MAX1243 product line was designed for ultra-low-power, space-constrained data acquisition - delivering 10-bit precision with integrated reference and minimal external components in SO-8 packaging.
FAQ
What is the operating temperature range for MAX1242BCSA-TG068?
The MAX1242BCSA-TG068 is specified for 0°C to +70°C ambient operation, matching the 'C' grade designation in Maxim's ordering nomenclature. This range covers commercial and light industrial environments where thermal management is controlled, and it aligns with the SO-8 package's thermal dissipation capability under 3.7mW active load.
Does MAX1242BCSA-TG068 require an external reference capacitor?
Yes - MAX1242BCSA-TG068 requires a 4.7µF capacitor at the REF pin when using its internal 2.5V reference. This capacitor stabilizes the reference output during conversion and startup; omitting it causes reference droop and gain error. A 0.1µF ceramic capacitor is also recommended in parallel for high-frequency noise suppression.
How does the SHDN pin function on MAX1242BCSA-TG068?
SHDN on MAX1242BCSA-TG068 is a three-level control: pulled low → 2µA shutdown mode; pulled high → internal reference enabled; left floating → internal reference disabled (allowing external reference use). This dual-role pin eliminates need for separate reference-enable logic in system design.
Can MAX1242BCSA-TG068 interface directly with an STM32 microcontroller's SPI peripheral?
Yes - MAX1242BCSA-TG068 supports standard SPI mode 0 (CPOL = 0, CPHA = 0) and connects directly to STM32 SPI peripherals. Configure the MCU as master, use GPIO for CS control, and clock data out on SCLK falling edge. No level shifting is needed for 3.3V or 5V STM32 variants due to MAX1242BCSA-TG068's wide VIH/VIL thresholds.
What is the maximum clock frequency supported by MAX1242BCSA-TG068's serial interface?
MAX1242BCSA-TG068 supports SCLK frequencies up to 2.1MHz, with no duty-cycle restriction as long as each high/low phase is ≥200ns. At 2.1MHz, the full 13-bit serial frame (EOC + 10 data bits + 2 sub-bits) transfers in <6.2µs - enabling rapid readout between conversions without MCU overhead.
MAX1242BCSA-TG068 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 73k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- 3-Wire Serial, Microwire, QSPI, 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-TG068 FAQ
1.How can I place an order for MAX1242BCSA-TG068 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1242BCSA-TG068 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-TG068 reliable?
The price and inventory of MAX1242BCSA-TG068 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1242BCSA-TG068 is usually 5 days.
3.What payment methods are accepted for MAX1242BCSA-TG068?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1242BCSA-TG068 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1242BCSA-TG068?
MAX1242BCSA-TG068 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1242BCSA-TG068 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-TG068?
For technical support, including MAX1242BCSA-TG068 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1242BCSA-TG068 requirements.
6.How does Aetrix verify that MAX1242BCSA-TG068 is sourced from the original manufacturer or authorized distributors?
All MAX1242BCSA-TG068 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-TG068 meets industry standards.
7.What is the process for return or replacement of MAX1242BCSA-TG068?
All MAX1242BCSA-TG068 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1242BCSA-TG068, 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-TG068 part is unused and in its original packaging.
Return procedure for MAX1242BCSA-TG068:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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