General Description
The MAX1236–MAX1239 low-power, 12-bit, multichannel 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 (MAX1237/MAX1239) or 4.5V to 5.5V (MAX1236/MAX1238) and require only 670µA at the maximum sampling rate of 94.4ksps. Supply current falls below 230µA for sampling rates under 46ksps. AutoShutdown™ powers down the devices between conversions, reducing supply current to less than 1µA at low throughput rates.

Features
♦ High-Speed I2C-Compatible Serial Interface
    400kHz Fast Mode
    1.7MHz High-Speed Mode
♦ Single-Supply
    2.7V to 3.6V (MAX1237/MAX1239)
    4.5V to 5.5V (MAX1236/MAX1238)
♦ Internal Reference
    2.048V (MAX1237/MAX1239)
    4.096V (MAX1236/MAX1238)
♦ External Reference: 1V to VDD
♦ Internal Clock
♦ 4-Channel Single-Ended or 2-Channel Fully Differential (MAX1236/MAX1237)
♦ 12-Channel Single-Ended or 6-Channel Fully Differential (MAX1238/MAX1239)
♦ 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
♦ Small Packages
    8-Pin µMAX (MAX1236/MAX1237)
    16-Pin QSOP (MAX1238/MAX1239)

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