GENERAL DESCRIPTION
The AD7820 is a high speed, microprocessor-compatible 8-bit analog-to digital converter which technique to achieve a conversion time of 1.36μs. 
   
FEATURES
    Fast Conversion Time: 1.36 μs max
    Built-In Track-and-Hold Function
    No Missed Codes
    No User Trims Required
    Single +5V Supply
    Ratiometric Operation
    No External Clock
    Extended Temperature Range Operation
    Skinny 20-Pin DlP, SOIC, and 20-Terminal
        Surface-Mount Packages