WM8197

The WM8197 is a 16-bit analogue front end/digitiser IC which processes and digitises the analogue output signals from CCD sensors or Contact Image Sensors (CIS) at pixel sample rates of up to 12MSPS.

The WM8197 includes three analogue signal processing channels each of which contains Reset Level Clamping,Correlated Double Sampling and Programmable Gain and Offset Adjust functions. Three multiplexers allow single channel processing. The output from each of these channels is time multiplexed into a single high-speed 16-bit analogue-to-digital converter. The digital output data is available in 16-bit parallel or 8 or 4-bit wide multiplexed format, with no missing codes.

An internal 4-bit DAC of the WM8197 is supplied for internal reference level generation. This may be used during CDS to reference CIS signals or during Reset Level Clamping to clamp CCD signals. Alternatively an external reference level may be applied. ADC references are generated internally, ensuring optimum performance from the device.

Using an analogue supply voltage of 5V and a digital interface supply of either 5V or 3.3V, the WM8197 typically only consumes 210mW when operating from a single 5V supply and less than 20A when in power down mode.