MAX1271ACNG+

ADCs/DACs - Special Purpose Overview

The MAX1271ACNG+ is a multirange, 12-bit data acquisition system (DAS) from Analog Devices/Maxim Integrated. It operates on a single +5V supply while accepting analog input signals spanning above the rail and below ground. The device features eight software-programmable analog input channels with selectable ranges of ±VREF, ±VREF/2, 0 to VREF, and 0 to VREF/2. It provides an effective dynamic range of 14 bits through range switching and includes fault protection up to ±16.5V. Key specifications include a 110ksps sampling rate, SPI/QSPI/MICROWIRE-compatible serial interface, and internal or external reference options.

ADCs/DACs - Special Purpose Feature Summary

• 12-Bit Resolution with 0.5 LSB Integral Nonlinearity
• +5V Single-Supply Operation with Overvoltage-Tolerant Inputs (±16.5V)
• Eight Analog Input Channels with Software-Selectable Ranges
• SPI/QSPI and MICROWIRE-Compatible 3-Wire Serial Interface

ADCs/DACs - Special Purpose Applications

• Industrial Control Systems
• Data-Acquisition Systems
• Battery-Powered Instruments
• Automatic Testing Equipment
• Medical Instruments

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type matches the required footprint, as this component is available in both 24-pin narrow PDIP and 28-pin SSOP configurations. Confirm the temperature grade corresponds to the specific application environment, ensuring the AC suffix aligns with the required operating range of 0°C to +70°C. Cross-reference the datasheet revision to ensure compatibility with existing design documentation.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX1271ACNG+ when interfacing sensors requiring unipolar or bipolar voltage ranges directly to a single +5V system without level shifting. This model supports input ranges defined by the reference voltage, offering flexibility for 4–20mA and ±12V/±15V sensors. Ensure the source impedance is low enough to meet acquisition time requirements or add input capacitance if necessary.

ADCs/DACs - Special Purpose Part Context

This component belongs to the MAX1270/MAX1271 family of multirange, serial 12-bit ADCs. The MAX1271 variant specifically allows input ranges relative to the reference voltage (±VREF, etc.), whereas the MAX1270 offers fixed voltage ranges (±10V, ±5V). Both share identical architecture, pinouts, and performance characteristics, differing primarily in programmable input scaling.

ADCs/DACs - Special Purpose Replacement Considerations

The MAX1270ACNG+ is a functional substitute within the same family, offering fixed input ranges instead of reference-relative ranges. Other MAX1271 variants include the AEAI+ for extended temperature ranges (-40°C to +85°C) and CAI+ for SSOP packaging.