The ADC0819 is an 8-Bit successive approximation A D converter with simultaneous serial I O The serial input controls an analog multiplexer which selects from 19 input channels or an internal half scale test voltage An input sample-and-hold is implemented by a capacitive reference ladder and sampled data comparator This allows the input signal to vary during the conversion cycle Separate serial I O and conversion clock inputs are provided to facilitate the interface to various microprocessors