DESCRIPTION

The WM8141 is a 12-bit analogue front end/digitiser that processes and digitises the analogue output signals from CCDs or Contact Image Sensors (CIS). The device can be operated as either a three channel or a single channel device at pixel sample rates of up to 6MSPS. The device has both external and programmable internal black level reference options for CIS operation. The WM8141 runs off a single supply voltage of either 3.3V or 5V. Alternatively, the device can be operated from split 5V core and 3.3V digital interface supplies.

FEATURES

• 12-bit resolution ADC

• 6MSPS conversion rate at 5V supply

• 5V or 3.3V single supply or 5V/3.3V dual supply operation

• Single or 3 channel operation

• Correlated double sampling

• Programmable gain (8-bit resolution)

• Programmable offset adjust (8-bit resolution)

• 12-bit parallel or 8/6/4-bit wide multiplexed output bus

• Internally generated voltage references

• External or internal reference for CIS operation

• Low power – 225mW typical at 5V supply

• Interface and timing compatible with WM8143, WM8144 and WM8142 devices

• Drop in replacement for WM8143-12

• 32-pin TQFP package

APPLICATIONS

• Flatbed and sheetfeed scanners

• USB compatible scanners

• Multi-function peripherals

• CCD sensor interface

• Contact image sensor (CIS) interface