WM8255 datasheet(1/49 Pages) CIRRUS

номер детали	WM8255

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

PDF	49 Pages

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производитель	CIRRUS [Cirrus Logic]

домашняя страница	http://www.cirrus.com

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WM8255

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

WOLFSON MICROELECTRONICS plc

Production Data, August 2013, Rev 4.7

Copyright

2013 Wolfson Microelectronics plc

DESCRIPTION

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.

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

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.

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.

FEATURES



16-bit ADC



12 MSPS conversion rate



Low power – 250 mW typical



5.75V and 3.3V supply operation



Single channel operation



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



3 wire serial control interface

APPLICATIONS



Flatbed and sheetfeed scanners



USB compatible scanners



Multi-function peripherals

BLOCK DIAGRAM

Аналогичный номер детали - WM8255

производитель	номер детали	датащи	подробное описание детали
Wolfson Microelectronic...	WM8253	278Kb / 27P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output
Cirrus Logic	WM8253	278Kb / 27P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output
Wolfson Microelectronic...	WM8253SCDS/RV	278Kb / 27P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output
	WM8253SCDS/V	278Kb / 27P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output
	WM8259	353Kb / 26P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output

More results

Аналогичное описание - WM8255

производитель	номер детали	датащи	подробное описание детали
Wolfson Microelectronic...	WM8192	619Kb / 24P	(88) Bit Output 16-bit CIS/CCD AFE/Digitiser
	WM8150	271Kb / 24P	SINGLE CHANNEL 12 BIT CIS/CCD AFE WITH 4 BIT WIDE OUTPUT
	WM8152	284Kb / 26P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output
	WM8150	299Kb / 26P	Single Channel 12-bit CIS/CCD AFE with 4-bit Wide Output
	WM8152	314Kb / 28P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output
	WM8253	278Kb / 27P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output
	WM8259	353Kb / 26P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output
Cirrus Logic	WM8152	418Kb / 28P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output
	WM8253	278Kb / 27P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output
	WM8259	353Kb / 26P	Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output

More results

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Аналогичный номер детали - WM8255

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