Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs

Lowest-Power 8-Bit Serial 2-Channel ADCs Have Internal Reference

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The MAX1108/MAX1109 low-power, 8-bit, dual-channel, analog-to-digital converters (ADCs) feature an internal track/hold (T/H) voltage reference, clock, and serial interface. The MAX1108 is specified from +2.7V to +3.6V and consumes only 105µA. The MAX1109 is specified from +4.5V to +5.5V and consumes only 130µA. The analog inputs are software configurable, allowing unipolar/bipolar and single-ended/differential operation; battery monitoring capability is also included.

The full-scale analog input range is determined by the internal reference of +2.048V (MAX1108) or +4.096V (MAX1109), or by an externally applied reference ranging from 1V to VDD. The MAX1108/MAX1109 also feature a software power-down mode that reduces power consumption to 0.5µA when the device is not in use. The 4-wire serial interface directly connects to SPI™, QSPI™, and MICROWIRE™ devices without external logic. Conversions up to 50ksps are performed using either the internal clock or an external serial-interface clock.

The MAX1108 and MAX1109 are available in a 10-pin µMAX package with a footprint that is just 20% of an 8-pin plastic DIP.
MAX1108, MAX1109: Typical Operating Circuit MAX1108, MAX1109: Typical Operating Circuit Enlarge+

Key Features

  • Single Supply:
    • +2.7V to +3.6V (MAX1108)
    • +4.5V to +5.5V (MAX1109)
  • Low Power:
    • 105µA at +3V and 50ksps
    • 0.5µA in Power-Down Mode
  • Software-Configurable Unipolar or Bipolar Inputs
  • Input Voltage Range: 0 to VDD
  • Internal Track/Hold
  • Internal Reference:
    • +2.048V (MAX1108)
    • +4.096V (MAX1109)
  • Reference Input Range: 1V to VDD
  • SPI/QSPI/MICROWIRE-Compatible Serial Interface
  • VDD Monitoring Mode
  • Small 10-Pin µMAX Package


  • 4mA- to 20mA-Powered Remote Systems
  • Handheld Measurement Devices
  • Medical Instruments
  • Portable Data Logging
  • Receive Signal Strength Indicators
  • Solar-Powered Remote Systems
  • System Diagnostics

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.

Technical Documents

App Note 4335 Saving Energy: Little Things Mean a Lot
Request Reliability Report for: MAX1109 
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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