WM8235GEFL/V

The WM8235 is a 16-bit 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 23MSPS.The WM8235 has a user selectable LVDS or CMOS output architecture. An internal 8-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. The WM8235 features a sensor timing clock generator for both CCD and CIS sensors. The clock generator can accept a slow or fast reference clock input and also has a flexible timing adjustment function for output timing clocks to allow use of many different sensors.

• 70MSPS conversion rate
• 16-bit ADC resolution
• Current consumption – 390mA
• 3.3V single supply operation
• Sample and hold / correlated double sampling
• Programmable offset adjust (8-bit resolution)
• Flexible clamp timing
• Pixel clamp / line clamp mode
• Programmable clamp voltage
• Programmable CIS/CCD timing generator
• Internally generated voltage references
• Compliant for Spread Spectrum Clock
• LVDS/CMOS output options
  • LVDS 5pair 490MHz 35-bit data
  • CMOS 90MHz output maximum
• Complete on chip clock generator. MCLK 5MHz to 23MHz
• Internal timing adjustment
• Automatic Gain Control
• Automatic Black Level Calibration
• 56-lead QFN package 7mm x 7mm
• Serial control interface