1.5V to 3.6V, 416ksps, 1-Channel True-Differential/2-Channel Single-Ended, 8-Bit, SAR ADCs

Ultra-Low Power and Supply Voltage Make These ADCs Ideal for Battery-Powered Applications

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The MAX1391/MAX1394 micropower, serial-output, 8-bit, analog-to-digital converters (ADCs) operate with a single power supply from +1.5V to +3.6V. These ADCs feature automatic shutdown, fast wake-up, and a high-speed 3-wire interface. Power consumption is only 0.743mW (VDD = +1.5V) at the maximum conversion rate of 416ksps. AutoShutdown™ between conversions reduces power consumption at slower throughput rates.

The MAX1391/MAX1394 require an external reference VREF that has a wide range from 0.6V to VDD. The MAX1391 provides one true-differential analog input that accepts signals ranging from 0 to VREF (unipolar mode) or ± VREF/2 (bipolar mode). The MAX1394 provides two single-ended inputs that accept signals ranging from 0 to VREF. Analog conversion results are available through a 5MHz 3-wire SPI™-/QSPI™-/MICROWIRE™-/digital signal processor (DSP)-compatible serial interface. Excellent dynamic performance, low voltage, low power, ease of use, and small package sizes make these converters ideal for portable battery-powered data-acquisition applications, as well as other applications that demand low-power consumption and minimal space.

The MAX1391/MAX1394 are available in a space-saving (3mm x 3mm), 10-pin TDFN package. The parts operate over the extended (-40°C to +85°C) temperature range.
MAX1391, MAX1394: Typical Operating Circuit MAX1391, MAX1394: Typical Operating Circuit Enlarge+

Key Features

  • 416ksps, 8-Bit Successive-Approximation Register (SAR) ADCs
  • Single True-Differential Analog Input Channel with Unipolar-/Bipolar-Selected Input (MAX1391)
  • Dual Single-Ended Input Channel with Channel-Selected Input (MAX1394)
  • ±0.2 LSB INL, ±0.2 LSB DNL, No Missing Codes
  • ±0.25 LSB Total Unadjusted Error (TUE)
  • 49dB SINAD at 100kHz Input Frequency
  • Single Supply Voltage (+1.5V to +3.6V)
  • 0.97mW at 416ksps, 1.8V
  • 0.230mW at 100ksps, 1.8V
  • 3.1µW at 1ksps, 1.8V
  • < 1µA Shutdown Current
  • External Reference (0.6V to VDD)
  • AutoShutdown Between Conversions
  • SPI-/QSPI-/MICROWIRE-/DSP-Compatible, 3- or 4-Wire Serial Interface
  • Small (3mm x 3mm), 10-Pin TDFN


  • Battery-Powered Instruments
  • Data Acquisition
  • Medical Instruments
  • Portable Data Logging
  • Process Control

Technical Documents

App Note 4490 How Signal Chains and PLCs Impact Our Lives

Quality and Environmental Data

Request Reliability Report for: MAX1391 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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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