WM8255SEFL/R
WM8255SEFL/R Datasheet
WM8255
| Part | Datasheet |
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WM8255SEFL/R |
WM8255SEFL/R (pdf) |
| Related Parts | Information |
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WM8255SEFL |
WM8255SEFL |
| PDF Datasheet Preview |
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| 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 |
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