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DESCRIPTION
The WM8224 is an 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 60MSPS.
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. The output from each of these
channels is time multiplexed into a single high-speed 16-bit
Analogue to Digital Converter. The digital data is available in
a variety of output formats via the flexible data port.
An internal 4-bit DAC is supplied for internal reference level
generation. This may be used during CDS to reference CIS
signals or during Clamping to clamp CCD signals. An
external reference level may also be supplied. ADC
references are generated internally, ensuring optimum
performance from the device.
A programmable automatic Black-Level Calibration function
is available to adjust the DC offset of the output data. A
daisy chain feature allows multiple devices to operate
together using the same control interface and output data
bus.
WM8224
60MSPS 3-Channel AFE with Multiple Device Operation
and Programmable Automatic Black Level Calibration
FEATURES
12 or 16-bit ADC, 40MSPS conversion rate
8 or 10-bit ADC, 60MSPS conversion rate
Low power – 360 mW typical
3.3V single supply operation
3 channel operation
Daisy Chain feature for multiple device use
Correlated double sampling
Programmable gain (9-bit resolution)
Programmable offset adjust (8-bit resolution)
Flexible clamp timing
Programmable clamp voltage
Internally generated voltage references
Automatic Black Level Calibration
32-lead QFN package
Serial control interface
APPLICATIONS
Digital Copiers
USB2.0 compatible scanners
Multi-function peripherals
High-speed CCD/CIS sensor interface
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
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Production Data, June 2012, Rev 4.1
Copyright
2012
Wolfson Microelectronics plc.
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
