w

WM8232

70MSPS 3-Channel AFE with Sensor Timing Generation and

LVDS/CMOS Data Output

WOLFSON MICROELECTRONICS plc

Product Brief, February 2012, Rev 3.0

Copyright

2012 Wolfson Microelectronics plc.

DESCRIPTION

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.

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.

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.

The WM8232 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 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.

FEATURES



70MSPS conversion rate



16 bit ADC resolution



Current consumption – 230mA



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 35MHz



Internal timing adjustment



Automatic Gain Control



Automatic Black Level Calibration



56-lead QFN package 8mm x 8mm



Serial control interface

APPLICATIONS



Digital Copiers



USB2.0 compatible scanners



Multi-function peripherals



High-speed CCD/CIS sensor interface