Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range

Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range

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The MAX1272/MAX1273 multirange 12-bit data-acquisition systems (DAS) operate with a single 5V supply. The software-programmable analog input accepts a variety of voltage ranges: ±10V, ±5V, 0 to 10V, 0 to 5V for the MAX1272; ±VREF, ±VREF / 2, 0 to VREF, 0 to VREF / 2 for the MAX1273. The software-selectable extended analog input range increases the effective dynamic range to 14 bits and provides the flexibility to interface 4-20mA powered sensors directly to a single 5V system. In addition, the MAX1272 provides fault protection to ±12V. Other features include a 5MHz track/hold (T/H) bandwidth, 87ksps throughput rate, and internal (4.096V) or external (2.40V to 4.18V) reference.

The MAX1272/MAX1273 serial interfaces connect directly to SPI/QSPI™/MICROWIRE®-compatible devices without any external logic.

Four software-programmable power-down modes (delayed standby, immediate standby, delayed full power-down, and immediate full power-down) provide low-current shutdown between conversions. In standby mode, the internal reference buffer remains active, thus eliminating startup delay.

The MAX1272/MAX1273 are available in an 8-pin µMAX® package. Both devices are available in the extended (-40°C to +85°C) temperature range.
MAX1272, MAX1273: Typical Operating Circuit MAX1272, MAX1273: Typical Operating Circuit Enlarge+

Key Features

  • Four Software-Selectable Input Ranges
    • MAX1272: 0 to 10V, 0 to 5V, ±10V, ±5V
    • MAX1273: 0 to VREF, 0 to VREF / 2, ±VREF, ±VREF / 2
  • 12-Bit Resolution, No Missing Codes
  • 5V Single-Supply Operation
  • SPI/QSPI/MICROWIRE-Compatible 3-Wire Interface
  • 87ksps Sampling Rate
  • ±12V Fault-Protected Analog Input (MAX1272)
  • Internal (4.096V) or External (2.4V to 4.18V) Reference
  • Low Power
    • 1.5mA at 87ksps
    • 0.4mA at 10ksps
    • 0.2mA at 1ksps
  • Four Power-Down Modes
  • 8-Pin PDIP Package


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

See parametric specs for Precision ADCs (< 5Msps) (437)

Part NumberResolution
Input Chan.Conv. Rate
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
External VREF
External VREF
Unipolar VIN
Bipolar VIN
ADCmaxnominalminmaxmaxmaxSee Notes
MAX1272 12187SARSPIS.E. Only4.0962.44.18101070-870.3
$11.80 @500
MAX1273 4.0962.048-

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX1272EVSYS: Evaluation Kit/Evaluation System for the MAX1272 and MAX1273
Request Reliability Report for: MAX1273 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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