WM8232
105MSPS 3-Channel AFE with Sensor
Timing Generation and LVDS/CMOS Data Output
DESCRIPTION
FEATURES
105MSPS conversion rate
The WM8232 is a 16-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 35MSPS per channel.
16-bit ADC resolution
Current consumption – 230mA
3.3V single supply operation
The device has three analogue signal processing channels
each of which contains Reset Level Clamping, Correlated
Double Sampling (also Sample and Hold), Programmable
Gain, Automatic Gain Control (AGC) and Offset adjust
functions.
Sample and hold /correlated double sampling
Programmable offset adjust (8-bit resolution)
Flexible clamp timing
Pixel clamp / line clamp mode
Programmable clamp voltage
The output from each of these channels is time multiplexed,
in pairs, into three high-speed 16-bit Analogue to Digital
Converters. The digital data is available in a variety of
output formats via the flexible data port.
Programmable CIS/CCD timing generator
Internally generated voltage references
Compliant for Spread Spectrum Clock
LVDS/CMOS output options
The WM8232 has a user selectable LVDS or CMOS output
architecture.
LVDS 5pair 490MHz 35-bit data
CMOS 90MHz output maximum
Complete on chip clock generator. MCLK 5MHz to 35MHz
Internal timing adjustment
An internal 5-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.
Automatic Gain Control
Automatic Black Level Calibration
56-lead QFN package 8mm x 8mm
Serial control interface
A programmable automatic Black-Level Calibration function
is available to adjust the DC offset of the output data.
The WM8232 features a sensor timing clock generator for
both CCD and CIS sensors. The clock generator can accept
a slow or fast reference clock input and also has a flexible
timing adjustment function for output timing clocks to allow
use of many different sensors.
APPLICATIONS
Digital copiers
USB2.0 compatible scanners
Multi-function peripherals
High-speed CCD/CIS sensor interface
Rev 4.6
APR ‘16
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