DESCRIPTION
The WM8234 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 23MSPS per channel.
The device has six analogue signal processing channels each of which contains Reset Level Clamping, Correlated Double Sampling (also Sample and Hold), Programmable Gain, Automatic Gain Control (AGC) and Offset adjust functions.
The output from each of these channels is time multiplexed, in pairs, into two high-speed 16-bit Analogue to Digital Converters. The digital data is available in a variety of output formats via the flexible data port.
The WM8234 has a user selectable LVDS or CMOS output architecture.

FEATURES
• 140MSPS conversion rate
• 16 bit ADC resolution
• Current consumption – 280mA
• 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

APPLICATIONS
• Digital copiers
• USB2.0 compatible scanners
• Multi-function peripherals
• High-speed CCD/CIS sensor interface