General Description
The single MAX4036/MAX4037 and dual MAX4038/MAX4039 operational amplifiers operate from a single +1.4V to +3.6V (without reference) or +1.8V to +3.6V (with reference) supply and consume only 800nA of supply current per amplifier, and 1.1µA for the optional reference. The MAX4036/MAX4038 feature a common-mode input voltage range from 0V to VDD - 0.4V at VDD = 1.4V. The MAX4037/MAX4039 feature a 1.232V voltage reference capable of sourcing 100µA and sinking 20µA.
   
Features
♦ Ultra-Low 800nA per Amplifier Supply Current
♦ Ultra-Low 1.4V Supply Voltage Operation (1.8V for
    MAX4037/MAX4039)
♦ Rail-to-Rail Outputs Drive 5kΩ and 5000pF Load
♦ 1.232V ±0.5%, 120ppm/°C (max) Reference
    (MAX4037/MAX4039)
♦ No External Reference Bypass Capacitor
    Required
♦ No Phase Reversal for Overdriven Inputs
♦ Low 1.0pA (typ) Input Bias Current
♦ Low 200μV Input Offset Voltage
♦ Unity-Gain Stable
♦ Available in Tiny UCSP, SC70, SOT23, TDFN, and
    μMAX Packages
♦ Available in -40°C to +125°C Temperature Range
    (MAX4036A/MAX4038A)
   
Applications
    Battery-Powered/Solar-Powered Systems
    Portable Medical Instrumentation
    Pagers and Cell Phones
    Micropower Thermostats and Potentiostats
    Electrometer Amplifiers
    Remote Sensor Amplifiers
    Active Badges
    pH Meters