The WM8224 is an analog front end/digitizer IC which processes and digitizes the analog output signals from CCD sensors or Contact Image Sensors (CIS) at pixel sample rates of up to 60MSPS. The device includes three analog signal processing channels each of which contains reset level clamping, correlated double sampling and programmable gain and offset adjust functions. The output from each of these channels is time multiplexed into a single high-speed 16-bit analog to digital converter. The digital data is available in a variety of output formats via the flexible data port. An internal 4-bit DAC is supplied for internal reference level generation. This may be used during CDS to reference CIS signals or during clamping to clamp CCD signals. An external reference level may also be supplied. ADC references are generated internally, ensuring optimum performance from the device. A programmable automatic black-level Calibration function is available to adjust the DC offset of the output data. A daisy chain feature allows multiple devices to operate together using the same control interface and output data bus.