Low-Power, 1-/2-Channel, I²C, 12-Bit ADCs in Ultra-Tiny 1.9mm x 2.2mm Package

 

Part Number	Replacement	Explanation

Description

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The MAX11644/MAX11645 low-power, 12-bit, 1-/2-channel analog-to-digital converters (ADCs) feature internal track/hold (T/H), voltage reference, clock, and an I²C-compatible 2-wire serial interface. These devices operate from a single supply of 2.7V to 3.6V (MAX11645) or 4.5V to 5.5V (MAX11644) and require only 6µA at a 1ksps sample rate. AutoShutdown™ powers down the devices between conversions, reducing supply current to less than 1µA at low throughput rates. The MAX11644/MAX11645 each measure two single-ended or one differential input. The fully differential analog inputs are software configurable for unipolar or bipolar, and single-ended or differential operation.

The full-scale analog input range is determined by the internal reference or by an externally applied reference voltage ranging from 1V to V_DD. The MAX11645 features a 2.048V internal reference and the MAX11644 features a 4.096V internal reference.

The MAX11644/MAX11645 are available in an ultra-tiny 1.9mm x 2.2mm WLP package and an 8-pin µMAX® package. The MAX11644/MAX11645 are guaranteed over the extended temperature range (-40°C to +85°C). For pin-compatible 10-bit parts, refer to the MAX11646/MAX11647 data sheet.

MAX11644, MAX11645: Typical Operating Circuit Enlarge+

Key Features

• Ultra-Tiny 1.9mm x 2.2mm Wafer Level Package
• High-Speed I²C-Compatible Serial Interface
  • 400kHz Fast Mode
  • 1.7MHz High-Speed Mode
• Single-Supply
  • 2.7V to 3.6V (MAX11645)
  • 4.5V to 5.5V (MAX11644)
• Internal Reference
  • 2.048V (MAX11645)
  • 4.096V (MAX11644)
• External Reference: 1V to V_DD
• Internal Clock
  • 2-Channel Single-Ended or 1-Channel Fully Differential
• Internal FIFO with Channel-Scan Mode
• Low Power
  • 670µA at 94.4ksps
  • 230µA at 40ksps
  • 60µA at 10ksps
  • 6µA at 1ksps
  • 0.5µA in Power-Down Mode
• Software-Configurable Unipolar/Bipolar

Applications/Uses

• Battery-Powered Test Equipment
• Handheld Portable Applications
• Medical Instruments
• Power-Supply Monitoring
• Received-Signal-Strength Indicators
• Solar-Powered Remote Systems
• System Supervision