WM8215: 3-channel high speed CCD/CIS ADC
The WM8215 is a 10-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 60MSPS.
The device includes three analogue 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 10-bit Analogue to Digital Converter. The digital output data is available in 10-bit wide parallel format.
An internal 4-bit DAC is supplied for internal reference level generation. This may be used to reference CIS signals, in non-CDS mode or to clamp CCD signals during Reset Level Clamping. An external reference level may also be supplied. ADC references are generated internally, ensuring optimum performance from the device.
Using an analogue supply voltage of 3.3V and a digital interface supply of 3.3V, the WM8215 typically only consumes 400mW.
- 10-bit ADC
- 60MSPS conversion rate
- Low power – 400mW typical
- 3.3V single supply operation
- 3 channel operation
- Correlated double sampling
- Programmable gain (9-bit resolution)
- Programmable offset adjust (8-bit resolution)
- Flexible clamp timing
- Programmable clamp voltage
- Internally generated voltage references
- 32-lead QFN package
- Serial control interface