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

 

Part Number	Replacement	Explanation

Description

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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 V_DD. 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 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 V_DD
• Internal Track/Hold
• Internal Reference:
  • +2.048V (MAX1108)
  • +4.096V (MAX1109)
• Reference Input Range: 1V to V_DD
• SPI/QSPI/MICROWIRE-Compatible Serial Interface
• V_DD Monitoring Mode
• Small 10-Pin µMAX Package

Applications/Uses

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