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Analog Devices Inc./Maxim Integrated MAX1242ACSA+
- Part No.:
- MAX1242ACSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1242ACSA+.pdf
- Description:
- IC ADC 10BIT SERIAL 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MAX1242ACSA+ 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. It operates from a single +2.7V to +5.25V supply in an 8-pin SO package and targets space-constrained, battery-powered data acquisition systems.
For engineers reviewing the MAX1242ACSA+ datasheet, MAX1242ACSA+ pinout, MAX1242ACSA+ application, or MAX1242ACSA+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Maxim's official Rev 3 datasheet and package specifications.
Technical Context
The MAX1242ACSA+ integrates a track/hold amplifier with 1.5µs acquisition time, a 10-bit SAR core, and on-chip clock generation. Its internal 2.5V reference is trimmed to ±0.5 LSB INL and exhibits ±30ppm/°C temperature coefficient, enabling stable conversions without external reference components.
It uses unipolar serial output format: one leading EOC bit, ten data bits (MSB first), two sub-bits, and trailing zeros. The 3-wire interface requires only SCLK, CS, and DOUT - compatible with standard microcontroller I/O ports and supporting up to 2.1MHz clock rates with unrestricted duty cycle (≥200ns per phase).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR architecture delivering 1024 discrete digital codes over full-scale input range. |
| Throughput Rate | 73ksps maximum sampling speed - sufficient for DC to ~10kHz signal digitization with Nyquist margin. |
| Reference | Internal 2.5V precision reference (±0.5 LSB INL at TA = 0°C to +70°C); bypassed with 4.7µF capacitor. |
| Power Consumption | 3.7mW at 73ksps (VDD = 3V); drops to 5µW in shutdown mode - enables ultra-low-duty-cycle sensor logging. |
| Analog Input Range | 0V to VREF (0V to 2.5V), supported by internal track/hold with 2.25MHz small-signal bandwidth. |
| INL / DNL | ±0.5 LSB integral nonlinearity and ±1 LSB differential nonlinearity - ensures monotonicity and <0.05% full-scale error. |
| SPI Compatibility | CPOL = 0, CPHA = 0 timing; supports direct connection to standard MCU SPI peripherals without level-shifting. |
Pinout & Package
MAX1242ACSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with gull-wing leads and thermal pad connected to GND. Pin pitch is 1.27mm; body dimensions are 4.9mm × 3.9mm × 1.75mm (JEDEC MS-012).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply rail | Accepts +2.7V to +5.25V; powers analog and digital sections; decoupling required near pin. |
| 2 AIN | Analog input | Single-ended input for 0V–2.5V signals; protected by internal clamps (GND−0.3V to VDD+0.3V). |
| 3 SHDN | Three-level shutdown control | Pull low for <10µA shutdown; high enables internal reference; open disables reference for external use. |
| 4 REF | Reference voltage node | Outputs 2.5V (MAX1242) or accepts external 1.0V–VDD reference; requires ≥4.7µF bypass for internal mode. |
| 5 GND | Analog/digital ground | Common return for analog and digital circuits; must be low-impedance and star-connected. |
| 6 DOUT | Serial data output | Three-state output; drives MSB-first unipolar stream (EOC + 10 bits + 2 sub-bits); transitions on SCLK falling edge. |
| 7 CS | Active-low chip select | Falling edge initiates conversion and forces DOUT out of high-Z; rising edge terminates data read. |
| 8 SCLK | Serial clock input | Asynchronous master clock (≤2.1MHz); controls data shift timing; must remain low during conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V logic- and analog-compatible supply eliminates dual-rail design complexity. |
| Integrated track/hold | 1.5µs acquisition time enables accurate sampling of fast transients without external TH circuitry. |
| Low-power shutdown | 5µW shutdown current allows >1000× power reduction between conversions in intermittent sensing. |
| Pin-compatible 12-bit upgrade path | Direct replacement with MAX1240/MAX1241 (same SO-8 footprint, identical pinout, higher resolution). |
| Industrial temperature grade | Specified for 0°C to +70°C ambient operation - validated across full voltage and timing ranges. |
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 ADC digitizing conditioned analog outputs from analog front-end op-amps and RTD bridges. Use Value: 3.7mW active power and 5µW shutdown enable multi-year operation on coin-cell batteries. |
Use Scenario: DIN-rail mounted PLC module measuring 4–20mA loop signals and thermocouple inputs in factory automation. IC Role / Device Role / Timing Role: Isolated analog input channel ADC interfacing via optocoupled SPI bus to main controller. Use Value: Internal 2.5V reference eliminates need for external precision reference IC, reducing BOM count and layout area. |
| Test Equipment | Temperature Measurement |
Use Scenario: Handheld multimeter with auto-ranging analog input stage and LCD display. IC Role / Device Role / Timing Role: High-accuracy digitizer for DC voltage/current measurements with 10-bit resolution and <0.05% FS error. Use Value: ±0.5 LSB INL and 66dB SINAD ensure repeatability and low noise floor for lab-grade readings. |
Use Scenario: Medical thermometer using NTC thermistor in voltage-divider configuration. IC Role / Device Role / Timing Role: Low-drift ADC capturing ratiometric thermistor voltage with internal reference as excitation source. Use Value: ±30ppm/°C reference tempco and 1.5µs acquisition support stable readings despite ambient drift. |
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 |
|---|---|---|---|
| MAX1242BCSA+ | Same SO-8 package and pinout; ±1 LSB INL (vs. ±0.5 LSB for MAX1242ACSA+); otherwise identical specs. | Acceptable where <0.1% full-scale linearity is sufficient; lower cost for less demanding metrology. | Select MAX1242BCSA+ when system-level calibration compensates for higher INL; no PCB changes required. |
| ADS7822U | TI 12-bit SAR ADC in SO-8; 100ksps; external reference only; 2.7–5.25V supply; SPI-compatible but no internal reference. | Requires external 2.5V reference and additional decoupling; offers higher resolution but adds BOM and layout complexity. | Choose ADS7822U only if 12-bit resolution is mandatory and external reference infrastructure already exists. |
Compared with MAX1242BCSA+, the MAX1242ACSA+ provides tighter ±0.5 LSB INL for improved absolute accuracy without calibration. Against ADS7822U, it trades 2-bit resolution for integrated reference simplicity and lower system-level power in intermittently powered designs.
Availability
MAX1242ACSA+ is available at Aetrix Electronics and suitable for portable data logging, process control monitoring, and test equipment requiring stable component supply, industrial temperature grading, and RoHS-compliant packaging.
Supply support for MAX1242ACSA+ 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 belongs to Maxim's low-power serial ADC product line, engineered specifically for space- and energy-constrained remote sensing and data acquisition systems operating from single supplies.
FAQ
What is the reference voltage specification for MAX1242ACSA+?
The MAX1242ACSA+ features an internal 2.5V reference trimmed to ±0.5 LSB integral nonlinearity over 0°C to +70°C. Its output voltage is specified as 2.470V to 2.530V at +25°C, with ±30ppm/°C temperature coefficient. A 4.7µF capacitor must be placed at the REF pin for stability and accuracy; the reference is enabled when SHDN is pulled high.
Does MAX1242ACSA+ support SPI communication?
Yes, the MAX1242ACSA+ supports SPI communication with CPOL = 0 and CPHA = 0 timing. It uses a 3-wire interface (CS, SCLK, DOUT) and outputs data in MSB-first unipolar format: one leading EOC bit, ten data bits, and two sub-bits. The device is fully compatible with standard microcontroller SPI peripherals without requiring protocol translation.
What is the maximum sampling rate of MAX1242ACSA+?
The MAX1242ACSA+ achieves a maximum sampling rate of 73ksps at VDD = 3V and fSCLK = 2.1MHz. Its 7.5µs conversion time and 1.5µs track/hold acquisition time are guaranteed across the full operating temperature range (0°C to +70°C) and supply range (+2.7V to +5.25V).
How does shutdown mode work on MAX1242ACSA+?
Shutdown mode on MAX1242ACSA+ is activated by pulling the SHDN pin low, reducing supply current to ≤10µA (VDD ≤3.6V). In shutdown, the internal reference and analog circuitry are disabled. Wake-up time depends on external REF capacitor discharge; with the required 4.7µF bypass, wake-up delay increases with shutdown duration (up to ~20ms after long idle periods).
Is MAX1242ACSA+ pin-compatible with any higher-resolution alternatives?
Yes, the MAX1242ACSA+ is pin-compatible with the MAX1240/MAX1241 - 12-bit versions in the same SO-8 package with identical pinout and interface behavior. This allows straightforward resolution upgrades without PCB redesign, though external reference bypassing and timing margins must be revalidated for the higher-resolution devices.
MAX1242ACSA+ 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1242ACSA+ FAQ
1.How can I place an order for MAX1242ACSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1242ACSA+ 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 MAX1242ACSA+ reliable?
The price and inventory of MAX1242ACSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1242ACSA+ is usually 5 days.
3.What payment methods are accepted for MAX1242ACSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1242ACSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1242ACSA+?
MAX1242ACSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1242ACSA+ 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 MAX1242ACSA+?
For technical support, including MAX1242ACSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1242ACSA+ requirements.
6.How does Aetrix verify that MAX1242ACSA+ is sourced from the original manufacturer or authorized distributors?
All MAX1242ACSA+ 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 MAX1242ACSA+ meets industry standards.
7.What is the process for return or replacement of MAX1242ACSA+?
All MAX1242ACSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1242ACSA+, 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 MAX1242ACSA+ part is unused and in its original packaging.
Return procedure for MAX1242ACSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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