GENERAL DESCRIPTION
The AD7740 is a low-cost, ultrasmall synchronous Voltage-to-Frequency Converter (VFC). It works from a single 3.0 V to 3.6 V or 4.75 V to 5.25 V supply consuming 0.9 mA. The AD7740 is available in an 8-lead SOT-23 and also in an 8-lead microSOIC package. Small package, low cost and ease of use were major design goals for this product. The part contains an on-chip 2.5 V bandgap reference but the user may overdrive this using an external reference. This external reference range includes VDD.
   
FEATURES
    Synchronous Operation
    Full-Scale Frequency Set by External System Clock
    8-Lead SOT-23 and 8-Lead microSOIC Packages
    3 V or 5 V Operation
    Low Power: 3 mW (Typ)
    Nominal Input Range: 0 to VREF
    True –150 mV Capability Without Charge Pump
    VREF Range: 2.5 V to VDD
    Internal 2.5 V Reference
    1 MHz Max Input Frequency
    Selectable High Impedance Buffered Input
    Minimal External Components Required
   
APPLICATIONS
    Isolation of High Common-Mode Voltages
    Low-Cost Analog-to-Digital Conversion
    Battery Monitoring
    Automotive Sensing