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LM9812 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM9812 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 37 page  1 http://www.national.com General Description The LM9812 is a high performance integrated signal proces- sor/digitizer for color linear CCD image scanners. The LM9812 performs all the signal processing (correlated double sampling, pixel rate offset and shading correction, color balance control, and 10-bit analog-to-digital conversion) necessary to maximize the performance of a wide range of linear CCD sensors. The LM9812 can be digitally programmed to work with a wide variety of CCDs from different manufacturers, including both 3 output RGB and 2 output GRGB CCDs. An internal Configura- tion Register sets CCD and sampling timing to maximize perfor- mance, simplifying the design and manufacturing processes. For complementary voltage reference see the LM4041-ADJ. Applications • Color Flatbed Document Scanners • Color Sheetfed Scanners • Multifunction Imaging Products • Digital Copiers • General Purpose Linear CCD Imaging Features • 6 million pixels/s conversion rate (2MHz/channel x 3) • Pixel rate shading (gain) correction for individual pixels eliminates errors from PRNU, illumination, etc. • Digitally programmed color balance controls • Pixel rate offset correction for highest quality in dark regions • Correlated Double Sampling for lowest noise • Reference and signal sampling points digitally controlled in 20ns increments • 2x and 4x analog fast preview/low resolution modes • Digital control of CCD integration time • Generates all necessary CCD clock signals • Compatible with a wide range of color linear CCDs and Contact Image Sensors (CIS) • TTL/CMOS input/output compatible Key Specifications • Output Data Resolution 10 Bits • Pixel Conversion Rate (total) 6MHz • Supply Voltage +5V±5% • Supply Voltage (Digital I/O) +3.3V±10% or +5V±5% • Power Dissipation (typical) 390mW LM9812 30-Bit Color Linear CCD Sensor Processor Connection Diagrams 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 TR2 ø1 TR1 SYNC RUN/STOP ø2 RS 52 51 50 49 48 47 40 41 42 43 44 45 46 VDI/O DGNDI/O MCLK CS GCLK OCLK WR RD RD PIXEL LM9812CCV D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Ordering Information Commercial (0°C ≤ T A ≤ +70°C) Package LM9812CCV V52A 52 Pin Plastic Leaded Chip Carrier December 1997 N ©1997 National Semiconductor Corporation TRI-STATE® is a registered trademark of National Semiconductor Corporation. |
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