WM8255SEFL

WM8255SEFL Datasheet

WM8255

Part	Datasheet
WM8255SEFL	WM8255SEFL (pdf)

Related Parts	Information
WM8255SEFL/R	WM8255SEFL/R

PDF Datasheet Preview
WM8255 Single Channel 16-bit CIS/CCD AFE with RGB LED Current Drive 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. BLOCK DIAGRAM • 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 • Flatbed and sheetfeed scanners • USB compatible scanners • Multi-function peripherals WOLFSON MICROELECTRONICS plc Production Data WM8255 TABLE OF CONTENTS 1 FEATURES 1 BLOCK DIAGRAM 1 TABLE OF 2 PIN CONFIGURATION 4 ORDERING 4 PIN 5 ABSOLUTE MAXIMUM RATINGS 6 RECOMMENDED OPERATING 6 THERMAL 6 ELECTRICAL CHARACTERISTICS 7 INPUT VIDEO SAMPLING 10 OUTPUT DATA 10 SERIAL INTERFACE 11 PWM TIMING 12 DEVICE DESCRIPTION 13 DEVICE 40 REGISTER MAP 40 EXTENDED PAGE REGISTERS 41 REGISTER MAP DESCRIPTION 41 EXTENDED PAGE REGISTER MAP DESCRIPTION 45 RECOMMENDED EXTERNAL 46 WM8255 Production Data PACKAGE 47 QFN 5 X 5 X 0.85MM 47 QFN 4 X 4 X 0.85MM 47 IMPORTANT NOTICE 48 ADDRESS 48 Production Data PIN CONFIGURATION WM8255 VSMP SEN SCK SDI NC LEDSTART TG EXTRES VRB VRT VRX NC AGND2 AVDD2 ORDERING INFORMATION DEVICE TEMPERATURE RANGE WM8255BGEFL/V 0 to 85oC WM8255BGEFL/RV Note Reel quantity = 3,500 0 to 85oC PACKAGE 4x4x0.85mm 28-lead QFN Pb-free 4x4x0.85mm 28-lead QFN Pb-free, tape and reel MOISTURE SENSITIVITY LEVEL MSL3 MSL3 PEAK SOLDERING TEMPERATURE 260oC 260oC WM8255 Production Data PIN DESCRIPTION PIN NO 1 2 3 4 5 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 NAME MCLK TYPE Digital input OP[3]/SDO OP[2] OP[1] OP[0] Digital output Digital output Digital output Digital output DVDD DGND EXTRES Supply Analogue input Analogue output Analogue output Analogue output NC AGND2 AVDD2 No Connect Supply VINP Analogue input VRLC/VBIAS Analogue I/O ILEDB ILEDG ILEDR AVDD1 AGND1 TG LEDSTART NC SDI SCK SEN VSMP

PDF Datasheet Preview

WM8255

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

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.

BLOCK DIAGRAM
• 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
• Flatbed and sheetfeed scanners
• USB compatible scanners
• Multi-function peripherals

WOLFSON MICROELECTRONICS plc

Production Data

WM8255

TABLE OF CONTENTS
1 FEATURES 1 BLOCK DIAGRAM 1 TABLE OF 2 PIN CONFIGURATION 4 ORDERING 4 PIN 5 ABSOLUTE MAXIMUM RATINGS 6 RECOMMENDED OPERATING 6 THERMAL 6 ELECTRICAL CHARACTERISTICS 7

INPUT VIDEO SAMPLING 10 OUTPUT DATA 10 SERIAL INTERFACE 11 PWM TIMING 12

DEVICE DESCRIPTION 13

DEVICE 40 REGISTER MAP 40

EXTENDED PAGE REGISTERS 41 REGISTER MAP DESCRIPTION 41 EXTENDED PAGE REGISTER MAP DESCRIPTION 45

RECOMMENDED EXTERNAL 46

WM8255

Production Data

PACKAGE 47

QFN 5 X 5 X 0.85MM 47 QFN 4 X 4 X 0.85MM 47

IMPORTANT NOTICE 48

ADDRESS 48

Production Data

PIN CONFIGURATION

WM8255

VSMP SEN SCK SDI NC LEDSTART TG

EXTRES VRB VRT VRX NC

AGND2 AVDD2
ORDERING INFORMATION

DEVICE

TEMPERATURE RANGE

WM8255BGEFL/V
0 to 85oC

WM8255BGEFL/RV

Note Reel quantity = 3,500
0 to 85oC

PACKAGE
4x4x0.85mm 28-lead QFN

Pb-free 4x4x0.85mm 28-lead QFN Pb-free, tape and reel

MOISTURE SENSITIVITY LEVEL

MSL3

MSL3

PEAK SOLDERING TEMPERATURE 260oC
260oC

WM8255

Production Data

PIN DESCRIPTION

PIN NO 1
2 3 4 5
12 13 14
15 16
17 18 19 20 21 22 23 24 25 26 27 28

NAME MCLK

TYPE Digital input

OP[3]/SDO OP[2] OP[1] OP[0]

Digital output Digital output Digital output Digital output

DVDD DGND EXTRES

Supply Analogue input

Analogue output

Analogue output

Analogue output

NC AGND2 AVDD2

No Connect Supply

VINP

Analogue input

VRLC/VBIAS Analogue I/O

ILEDB ILEDG ILEDR AVDD1 AGND1

TG LEDSTART

NC SDI SCK SEN VSMP

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived WM8255SEFL Datasheet file may be downloaded here without warranties.

Datasheet ID: WM8255SEFL 523266