WM8234 Datasheet, PDF (1/15 Pages) Wolfson Microelectronics plc – 70MSPS 6-Channel AFE with Sensor Timing Generation and LVDS/CMOS Data Output

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WM8234
70MSPS 6-Channel AFE with Sensor Timing Generation and
LVDS/CMOS Data Output
DESCRIPTION
The WM8234 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 23MSPS.
The device has six 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.
The output from each of these channels is time multiplexed,
in pairs, into two high-speed 16-bit Analogue to Digital
Converters. The digital data is available in a variety of
output formats via the flexible data port.
The WM8234 has a user selectable LVDS or CMOS output
architecture.
An internal 8-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.
The WM8234 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.
FEATURES
 70MSPS conversion rate
 16 bit ADC resolution
 Current consumption – 280mA
 3.3V single supply operation
 Sample and hold /correlated double sampling
 Programmable offset adjust (8-bit resolution)
 Flexible clamp timing
 Pixel clamp / line clamp mode
 Programmable clamp voltage
 Programmable CIS/CCD timing generator
 Internally generated voltage references
 Compliant for Spread Spectrum Clock
 LVDS/CMOS output options
 LVDS 5pair 490MHz 35-bit data
 CMOS 90MHz output maximum
 Complete on chip clock generator. MCLK 5MHz to 23MHz
 Internal timing adjustment
 Automatic Gain Control
 Automatic Black Level Calibration
 56-lead QFN package 7mm x 7mm
 Serial control interface
APPLICATIONS
 Digital copiers
 USB2.0 compatible scanners
 Multi-function peripherals
 High-speed CCD/CIS sensor interface
WOLFSON MICROELECTRONICS plc
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Product Brief, February 2012, Rev 3.0
Copyright 2012 Wolfson Microelectronics plc.