WM8141

WM8141 12-bit 6MSPS CIS/CCD Analogue Front End/Digitiser Production Data, October 2000, Rev 3.0 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. The WM8141 includes three analogue signal processing channels each of which contains reset level clamping, correlated double sampling and programmable offset and gain adjust facilities. Each of these channels is time multiplexed into a single high-speed 12-bit resolution ADC, which digitises the pixel image information. The digital data output is available to the user in either 12-bit parallel or 8/6/4-bit wide multiplexed formats. The internal control registers are programmable via a convenient serial or parallel digital interface. The WM8141 typically consumes only 45mA and less than 10µA when in power down mode. 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) ...