Datasheet > WM8255

WM8255

更新时间： 2024-10-02 01:23:55

品牌	Logo	应用领域
凌云 - CIRRUS		/
页数	文件大小	规格书
49页	785K
描述
Single Channel 16-bit CIS/CCD AFE with RGB LED Current Drive

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WM8255 数据手册

WM8255

Single Channel 16-bit CIS/CCD AFE with RGB LED Current Drive

DESCRIPTION

FEATURES

The WM8255 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 12 MSPS.



16-bit ADC

12 MSPS conversion rate

Low power – 250 mW typical

5.75V and 3.3V supply operation

Single channel operation

The device includes a complete signal processing channel

containing Reset Level Clamping, Correlated Double

Sampling, Programmable Gain and Offset adjust functions.

Internal multiplexers allow fast switching of offset and gain

for line-by-line colour processing. The output from this

Correlated double sampling

Programmable gain (8-bit resolution)

Programmable offset adjust (8-bit resolution)

Programmable clamp voltage

RGB LED current drive using current and PWM

2-bit or 4-bit wide multiplexed data output format

Internally generated voltage references

28-lead QFN package

channel is time multiplexed into

a high-speed 16-bit

Analogue to Digital Converter. The digital output data is

available in a 2 bit or 4-bit wide multiplexed format.

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. An external reference level may also be supplied.

ADC references are generated internally, ensuring optimum

performance from the device.

3 wire serial control interface

APPLICATIONS



Flatbed and sheetfeed scanners

USB compatible scanners

Multi-function peripherals

The device includes an RGB LED current drive using current

and PWM functionality to control the operation of sensor

LEDs.

The device typically uses an analogue supply voltage of

5.75V and a digital interface supply of 3.3V.

BLOCK DIAGRAM

WOLFSON MICROELECTRONICS plc

Production Data, August 2013, Rev 4.7

12 3 4 5 6 7...49

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