1. Products
  2. A/D Converters (ADC)
  3. Precision A/D Converters
  4. Multiplexed A/D Converters
  5. MAX127


Features and Benefits

  • 12-Bit Resolution, 1/2 LSB Linearity
  • +5V Single-Supply Operation
  • I2C-Compatible, 2-Wire Serial Interface
  • Four Software-Selectable Input Ranges
    • MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V
    • MAX128: 0 to +VREF, 0 to +VREF/2, ±VREF, ±VREF/2
  • 8 Analog Input Channels
  • 8ksps Sampling Rate
  • ±16.5V Overvoltage-Tolerant Input Multiplexer
  • Internal 4.096V or External Reference
  • Two Power-Down Modes
  • 24-Pin Narrow PDIP or 28-Pin SSOP Packages

Product Details

The MAX127/MAX128 are multirange, 12-bit data acquisition systems (DAS) that require only a single +5V supply for operation, yet accept signals at their analog inputs that may span above the power-supply rail and below ground. These systems provide eight analog input channels that are independently software programmable for a variety of ranges: ±10V, ±5V, 0 to +10V, 0 to +5V for the MAX127; and ±VREF, ±VREF/2, 0 to +VREF, 0 to +VREF/2 for the MAX128. This range switching increases the effective dynamic range to 14 bits and provides the flexibility to interface 4–20mA, ±12V, and ±15V-powered sensors directly to a single +5V system. In addition, these converters are fault protected to ±16.5V; a fault condition on any channel will not affect the conversion result of the selected channel. Other features include a 5MHz bandwidth track/hold, an 8ksps throughput rate, and the option of an internal 4.096V or external reference.

The MAX127/MAX128 feature a 2-wire, I2C-compatible serial interface that allows communication among multiple devices using SDA and SCL lines.

A hardware shutdown input (SHDN) and two software-programmable power-down modes (standby and full power-down) are provided for low-current shutdown between conversions. In standby mode, the reference buffer remains active, eliminating startup delays.

The MAX127/MAX128 are available in 24-pin narrow PDIP or space-saving 28-pin SSOP packages.


  • Battery-Powered Applications
  • Data Acquisition
  • Industrial Control Systems
  • Robotics

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Product Recommendations

MAX127 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX127ACAI+ Material Declaration Reliability Data 28-SSOP-5.3_MM
MAX127ACAI+T Material Declaration Reliability Data 28-SSOP-5.3_MM
MAX127ACNG+ Material Declaration Reliability Data 24-PDIP-300_MIL
MAX127AEAI+ Material Declaration Reliability Data 28-SSOP-5.3_MM
MAX127AEAI+T Material Declaration Reliability Data 28-SSOP-5.3_MM
MAX127AENG+ Material Declaration Reliability Data 24-PDIP-300_MIL
MAX127BCAI+ Material Declaration Reliability Data 28-SSOP-5.3_MM
MAX127BCAI+T Material Declaration Reliability Data 28-SSOP-5.3_MM
MAX127BCNG+ Material Declaration Reliability Data 24-PDIP-300_MIL
MAX127BEAI+ Material Declaration Reliability Data 28-SSOP-5.3_MM
MAX127BEAI+T Material Declaration Reliability Data 28-SSOP-5.3_MM
MAX127BENG+ Material Declaration Reliability Data 24-PDIP-300_MIL
Wafer Fabrication Data MAX127 Reliability Data

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