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WM8195

Wolfson Microelectronics
Part Number WM8195
Manufacturer Wolfson Microelectronics
Description 14-bit 12MSPS CIS/CCD Analogue Front End/Digitiser
Published Apr 23, 2007
Detailed Description w DESCRIPTION The WM8195 is a 14-bit analogue front end/digitiser IC which processes and digitises the analogue output s...
Datasheet PDF File WM8195 PDF File

WM8195
WM8195

Overview
w DESCRIPTION The WM8195 is a 14-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 12MSPS.
The device includes three analogue signal processing channels each of which contains Reset Level Clamping, Correlated Double Sampling and Programmable Gain and Offset Adjust functions.
Three multiplexers allow single channel processing.
The output from each of these channels is time multiplexed into a single high-speed 14-bit analogue-to-digital converter.
The digital output data is available in 14-bit parallel or 8, 7 or 4-bit wide multiplexed format, with no missing codes.
An internal 4-bit DAC is supplied for internal reference level generation.
This may be used during CDS to reference CIS signals or during Reset Level Clamping to clamp CCD signals.
Alternatively an external reference level may be applied.
ADC references are generated internally, ensuring optimum performance from the device.
WM8195 14-bit 12MSPS CIS/CCD Analogue Front End/Digitiser FEATURES • • • • • • • • • • • • • • 14-bit ADC No missing codes guaranteed 12MSPS conversion rate Low power – 210mW typical 5V 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) Programmable clamp voltage 14-bit parallel or 8, 7 or 4-bit wide multiplexed data output formats Internally generated voltage references 48-lead TQFP package Serial or parallel control interface APPLICATIONS • • • • Flatbed and sheetfeed scanners USB compatible scanners Multi-function peripherals High-performance CCD sensor interface Using an analogue supply voltage of 5V and a digital interface supply of either 5V or 3.
3V, the WM8195 typically only consumes 210mW when operating from a single 5V www.
DataSheet4U.
com supply and less than 20µA when in power down mode.
BLOCK DIAGRAM VRLC/VBIAS VSMP ...


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