Datasheet > WM8259

WM8259

更新时间： 2024-10-01 11:59:15

品牌	Logo	应用领域
欧胜 - WOLFSON		/
页数	文件大小	规格书
26页	353K
描述
Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output

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WM8259 数据手册

WM8259

Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output

DESCRIPTION

FEATURES

•

16-bit ADC

The WM8259 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 3MSPS.

3MSPS conversion rate

Low power - 132mW typical

3.3V single supply or 3.3V/2.5V dual supply operation

Single channel operation, selectable inputs

Correlated double sampling

The device has two selectable video input pins and one

complete analogue 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 channel is

time multiplexed into a high-speed 16-bit Analogue to Digital

Converter. The digital output data is available in 4-bit wide

multiplexed format.

Programmable gain (8-bit resolution)

Programmable offset adjust (8-bit resolution)

Programmable clamp voltage

4-bit wide multiplexed data output format

Internally generated voltage references

20-lead SSOP package

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.

Serial control interface

APPLICATIONS

•

Flatbed and sheetfeed scanners

USB compatible scanners

Multi-function peripherals

The device uses an analogue supply voltage of 3.3V and a

digital interface supply of between 2.5V and 3.3V. The

WM8259 typically only consumes 132mW when operating

from a single 3.3V supply.

High-performance CCD sensor interface

BLOCK DIAGRAM

WOLFSON MICROELECTRONICS plc

Production Data, April 2007, Rev 4.2

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