1.5Msps, Single-Supply, Low-Power, True-Differential, 12-Bit ADCs with Internal Reference

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The MAX1277/MAX1279 are low-power, high-speed, serial-output, 12-bit, analog-to-digital converters (ADCs) with an internal reference that operates at up to 1.5Msps. These devices feature true-differential inputs, offering better noise immunity, distortion improvements, and a wider dynamic range over single-ended inputs. A standard SPI™/QSPI™/MICROWIRE™ interface provides the clock necessary for conversion. These devices easily interface with standard digital signal processor (DSP) synchronous serial interfaces.

The MAX1277/MAX1279 operate from a single +2.7V to +3.6V supply voltage. The MAX1277/MAX1279 include a 2.048V internal reference. The MAX1277 has a unipolar analog input, while the MAX1279 has a bipolar analog input. These devices feature a partial power-down mode and a full power-down mode for use between conversions, which lower the supply current to 2mA (typ) and 1µA (max), respectively. Also featured is a separate power-supply input (VL), which allows direct interfacing to +1.8V to VDD digital logic. The fast conversion speed, low-power dissipation, excellent AC performance, and DC accuracy (±1 LSB INL) make the MAX1277/MAX1279 ideal for industrial process control, motor control, and base-station applications.

The MAX1277/MAX1279 come in a 12-pin TQFN package, and are available in the extended (-40°C to +85°C) temperature range.
MAX1277, MAX1279: Typical Operating Circuit MAX1277, MAX1279: Typical Operating Circuit Enlarge+

Key Features

  • 1.5Msps Sampling Rate
  • Only 22mW (typ) Power Dissipation
  • Only 1µA (max) Shutdown Current
  • High-Speed, SPI-Compatible, 3-Wire Serial Interface
  • 68.5dB S/(N + D) at 525kHz Input Frequency
  • Internal True-Differential Track/Hold (T/H)
  • Internal 2.048V Reference
  • No Pipeline Delays
  • Small 12-Pin TQFN Package
  • Applications/Uses

    • Bill Validation
    • Communications
    • Data Acquisition
    • Motor Control
    • Portable Instrumentation

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

    Part NumberResolution
    Input Chan.Conv. Rate
    ADC ArchitectureData BusDiff/S.E. InputInternal VREF
    Unipolar VIN
    Bipolar VIN
    ADCmaxnominalmaxmaxSee Notes
    MAX1279 1211500SARSPIDiff. Only2.0482.0481.024-801
    $5.31 @1k

    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.
    Request Reliability Report for: MAX1279 
    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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