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Analog Devices Inc./Maxim Integrated MAX1271ACAI
- Part No.:
- MAX1271ACAI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1271ACAI.pdf
- Description:
- IC ADC 12BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,946
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Product details
Overview
The MAX1271ACAI from Maxim Integrated is a multirange, +5V-supply, 8-channel, serial 12-bit analog-to-digital converter (ADC) with ±16.5V overvoltage-tolerant inputs, software-selectable input ranges (0 to VREF, 0 to VREF/2, ±VREF, ±VREF/2), and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It delivers 110ksps throughput, 0.5 LSB INL, and internal 4.096V reference operation - enabling direct interfacing of ±12V/±15V industrial sensors into single +5V systems.
For engineers reviewing the MAX1271ACAI datasheet, MAX1271ACAI pinout, MAX1271ACAI application, or MAX1271ACAI equivalent, key selection considerations include its fault-protected multiplexer, dual power-down modes (STBYPD/FULLPD), 28-pin SSOP package, and compatibility with microcontrollers lacking dedicated ADC peripherals via simple serial control.
Technical Context
The MAX1271ACAI employs a successive-approximation register (SAR) architecture with integrated track/hold, supporting both internal and external clocking. Its resistor-divider network enables four independent software-configurable input ranges per channel, extending effective dynamic range to 14 bits through range switching.
It features a fault-protected analog input multiplexer tolerant to ±16.5V on any channel without affecting conversion integrity, and includes a programmable shutdown input (SHDN) plus two software-selectable power-down modes - STBYPD maintains reference buffer bias for fast wake-up, while FULLPD reduces supply current to ≤220µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes over temperature |
| INL | ±0.5 LSB max - ensures accurate full-scale linearity for precision sensor digitization |
| Throughput Rate | 110 ksps in external clock mode - supports high-speed data acquisition in real-time control loops |
| Input Voltage Ranges | Software-selectable per channel: 0 to VREF, 0 to VREF/2, ±VREF, ±VREF/2 - eliminates external signal conditioning for mixed-signal industrial sensors |
| Overvoltage Tolerance | ±16.5V on CH0–CH7 - protects against transient surges without latch-up or performance degradation |
| Reference | Internal 4.096V ±15 ppm/°C or external reference support - enables stable absolute measurement without external voltage reference IC |
| Supply | +5V single supply (4.75V to 5.25V) - simplifies power design in embedded +5V systems |
Pinout & Package
The MAX1271ACAI is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, optimized for space-constrained industrial PCBs. Pin functions are validated per Maxim's official pin description table (Rev 2, 9/04).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | +5V supply input | Bypassed with 0.1µF capacitor to AGND; powers analog and digital sections |
| AGND (Pin 14) | Analog ground reference | Separate from DGND to minimize noise coupling into sensitive analog front-end |
| DGND (Pin 2, 3) | Digital ground reference | Provides return path for serial interface and logic; must be connected to AGND at single point |
| CH0–CH7 (Pins 15–21, 23) | Analog input channels | Eight independently configurable inputs with ±16.5V fault protection and software-selectable ranges |
| SCLK (Pin 5) | Serial clock input | Drives data transfer timing; supports external clock mode (up to 2MHz) or internal clock synchronization |
| CS (Pin 6) | Active-low chip select | Enables serial communication; DOUT and SSTRB enter high-impedance state when CS = high |
| DIN (Pin 7) | Serial data input | Accepts 8-bit control byte (START, SEL2–SEL0, RNG, BIP, PD1, PD0) on rising SCLK edge |
| DOUT (Pin 10) | Serial data output | Outputs 12-bit conversion result MSB-first on falling SCLK edge; tri-stated when CS = high |
| SSTRB (Pin 8) | Serial strobe output | Indicates conversion status: pulses high before MSB in external clock mode; goes low during conversion in internal clock mode |
| SHDN (Pin 11) | Hardware shutdown input | Pull low to force FULLPD mode; pull high for normal operation - provides hardware-level power control |
| REF (Pin 27) | Reference buffer output / external reference input | Supplies 4.096V nominal reference; accepts external reference when REFADJ = VDD |
| REFADJ (Pin 26) | Reference adjust pin | Provides 2.500V ±1.5% bandgap output; used to trim internal reference or disable buffer for external reference use |
Key Features
| Feature | Design Value |
|---|---|
| Fault-protected analog multiplexer | ±16.5V tolerance on all eight channels - prevents damage and maintains conversion accuracy during sensor overvoltage events |
| Software-selectable input ranges | Four per channel (0 to VREF, 0 to VREF/2, ±VREF, ±VREF/2) - eliminates need for external gain/level-shifting circuitry |
| Dual power-down modes | STBYPD retains reference buffer bias (fast wake-up); FULLPD draws ≤220µA - extends battery life in portable instrumentation |
| SPI/QSPI/MICROWIRE compatibility | No external logic required - directly interfaces with common microcontroller serial peripherals using CPOL=0, CPHA=0 |
| Internal 4.096V reference | ±15 ppm/°C tempco with 4.7µF bypass - provides stable, calibrated reference without external components |
Applications
| Industrial Process Monitoring | Data Acquisition Systems |
|---|---|
Use Scenario: Continuous monitoring of 4–20mA current-loop transmitters and ±10V analog outputs from PLCs and field instruments. IC Role / Device Role / Timing Role: Multichannel ADC digitizing mixed-polarity sensor signals with fault tolerance and range flexibility. Use Value: Eliminates external signal conditioning and level-shifting, reducing BOM count and board area in DIN-rail mounted I/O modules. | Use Scenario: High-fidelity sampling of multiple analog sensors (temperature, pressure, strain) in lab-grade benchtop equipment. IC Role / Device Role / Timing Role: Precision 12-bit digitizer with 110ksps throughput and low INL for time-critical waveform capture. Use Value: Achieves 14-bit effective dynamic range via software range switching - improves SNR for low-amplitude signals without hardware reconfiguration. |
| Battery-Powered Test Equipment | Automated Test Equipment (ATE) |
Use Scenario: Portable multimeter or handheld oscilloscope requiring low-power, high-accuracy analog front-end. IC Role / Device Role / Timing Role: Low-quiescent-current ADC with STBYPD mode for rapid wake-up between measurements. Use Value: Reduces average supply current to sub-mA levels during idle periods while maintaining <15µs wake-up latency - extends battery runtime significantly. | Use Scenario: Channelized test head in production-line ATE performing parallel parametric testing of analog devices. IC Role / Device Role / Timing Role: Fault-tolerant ADC handling ±15V device-under-test (DUT) signals with channel isolation and overvoltage immunity. Use Value: Prevents cross-channel corruption during DUT fault conditions - ensures test validity and avoids false-fail results in high-volume manufacturing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320IDR | 16-bit resolution, SPI interface, no internal reference, requires external 2.5V ref; 100ksps max; 8-pin SOIC | Higher resolution but lower speed and no fault protection; suited for low-noise, low-channel-count precision apps | Select when absolute accuracy >12-bit is required and overvoltage risk is mitigated externally |
| MAX11607EEE+ | 12-bit, 8-channel, internal reference, ±16.5V tolerant, but only 100ksps; 16-pin QSOP; no SSTRB pin | Similar fault tolerance and integration, but lacks serial strobe for precise timing alignment | Select when lower throughput suffices and SSTRB-driven synchronization is not needed |
Compared with ADS8320IDR and MAX11607EEE+, the MAX1271ACAI uniquely combines 110ksps throughput, ±16.5V fault tolerance, software-selectable ranges, and SSTRB timing control - making it optimal for industrial multichannel DAQ where robustness, speed, and configurability are jointly critical.
Availability
The MAX1271ACAI is available at Aetrix Electronics and suitable for industrial process monitoring, battery-powered test equipment, automated test equipment, and data-acquisition systems requiring stable component supply across extended product lifecycles.
Supply support for MAX1271ACAI 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 high-reliability semiconductor solutions for industrial, medical, and communications markets.
The MAX1270/MAX1271 product line delivers multirange, fault-protected, serial 12-bit ADCs targeting industrial data acquisition where sensor interoperability, overvoltage resilience, and single-supply simplicity are essential.
FAQ
What is the maximum sampling rate of the MAX1271ACAI?
The MAX1271ACAI achieves a maximum throughput rate of 110 ksps in external clock mode with fSCLK = 2.0 MHz and 18 clock cycles per conversion. In internal clock mode, the maximum rate drops to 43 ksps due to fixed internal timing constraints. This specification is guaranteed over the 0°C to +70°C operating temperature range for the MAX1271ACAI variant.
Does the MAX1271ACAI require an external reference voltage?
No, the MAX1271ACAI does not require an external reference voltage. It integrates a factory-trimmed 4.096V internal reference with ±15 ppm/°C temperature coefficient and supports external reference operation via the REF pin when REFADJ is pulled to VDD. The internal reference is fully functional with a 4.7µF bypass capacitor and enables standalone operation without additional components.
How does the MAX1271ACAI handle overvoltage conditions on its analog inputs?
The MAX1271ACAI incorporates a fault-protected analog input multiplexer that withstands voltages from −16.5V to +16.5V on any channel (CH0–CH7) relative to AGND - even when the channel is unselected or the device is in FULLPD mode or powered down. This protection limits input current to <2mA and prevents corruption of conversions on other channels, ensuring system reliability in harsh industrial environments.
What are the power-down modes supported by the MAX1271ACAI?
The MAX1271ACAI supports two software-programmable power-down modes: Standby (STBYPD) and Full Power-Down (FULLPD). STBYPD maintains the internal reference buffer bias, enabling wake-up in <15µs with no reference settling delay. FULLPD reduces supply current to ≤220µA at +70°C but requires reference re-stabilization upon wake-up. Both modes are selected via PD1/PD0 bits in the control byte.
Is the MAX1271ACAI compatible with standard microcontroller serial interfaces?
Yes, the MAX1271ACAI features a SPI/QSPI/MICROWIRE-compatible 3-wire serial interface requiring no external logic. It operates with CPOL = 0 and CPHA = 0, and supports standard microcontroller SPI peripherals. Communication uses CS (active-low chip select), SCLK (serial clock), DIN (data in), and DOUT (data out), with optional SSTRB for precise timing alignment - simplifying firmware integration across ARM, PIC, and MSP430 platforms.
MAX1271ACAI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 110k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1271ACAI FAQ
1.How can I place an order for MAX1271ACAI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1271ACAI 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 MAX1271ACAI reliable?
The price and inventory of MAX1271ACAI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1271ACAI is usually 5 days.
3.What payment methods are accepted for MAX1271ACAI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1271ACAI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1271ACAI?
MAX1271ACAI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1271ACAI 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 MAX1271ACAI?
For technical support, including MAX1271ACAI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1271ACAI requirements.
6.How does Aetrix verify that MAX1271ACAI is sourced from the original manufacturer or authorized distributors?
All MAX1271ACAI 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 MAX1271ACAI meets industry standards.
7.What is the process for return or replacement of MAX1271ACAI?
All MAX1271ACAI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1271ACAI, 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 MAX1271ACAI part is unused and in its original packaging.
Return procedure for MAX1271ACAI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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