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