The XRD9855/XRD9856 are complete CCD Image Digitizers for digital cameras. The products include a high bandwidth differential Correlated Double Sampler (CDS), 8-bit digitally Programmable Gain Amplifier (PGA), 10-bit Analog-to-Digital Converter (ADC) and digital controlled black level auto-calibration circuitry. The Correlated Double Sampler (CDS) subtracts the CCD output signal black level from the video level. Common mode signal noise and power supply noise are rejected by the differential CDS input stage. CDS inputs are designed to be used either differential or singleended. The auto calibration circuit compensates for any internal offset of the XRD9855/XRD9856 as well as black level offset from the CCD.