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KLI-4104-RAA-CP-AA Datasheet(PDF) 5 Page - ON Semiconductor |
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KLI-4104-RAA-CP-AA Datasheet(HTML) 5 Page - ON Semiconductor |
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5 / 28 page  KLI−4104 www.onsemi.com 5 Zero re-phasing errors, in the final color image, is accomplished by having effectively center-aligned sampling apertures (pixels) in the luminance and chroma channels. Even though the luminance and chroma channels are physically edge-aligned vertically, when scan motion is introduced it has a “center-weighted” sampling effect at the full resolution scan speed. The following pixel alignment diagram explains in more detail the reason for being edge-aligned in the vertical direction and how the 12.25 line spacing (122.5 mm) works out to achieve zero re-phasing errors at full resolution. Figure 4. Pixel Alignment Diagram Luma Line# 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 12.25 Chroma Lines Center-to-Center or 24.5 Luma Lines Center-to-Center between Chroma and Luma Channels (Dimension Fixed on Sensor) Luma Sampling Aperture Chroma Sampling Aperture The y-axis of the diagram is the direction of scanning motion (luminance-leading scan in this case). Note on the x-axis, that the luminance sampling rate (represented by the arrows) is 2 × that of the chroma channel. Also note the horizontal dotted line, showing that the arrows are synchronized, depicting the effective center-aligned sampling of luminance and chroma channels after 25 luminance lines have been acquired. This equates to zero re-phasing error between luminance and chroma signals at full resolution. If scan speed is changed to lower the vertical resolution, a small re-phasing error may be introduced. High Speed Scanning The KLI−4104 sensor is ideal for applications such as high-speed document scanning. High data throughput is achieved by having a total of 7 outputs, 4 outputs on the luminance channel (4 ⋅ 30 MHz = 120 MHz total data rate), and 1 output per chroma channel (30 MHz each). Readout of the pixel data for the luminance channel is accomplished through the use of two CCD shift registers in an odd/even pixel readout configuration (4 outputs total). A system can be designed with the KLI−4104 to achieve high-resolution color scans (600 dpi), when scanning the longer length side of A4 paper size at over 150 pages per minute. |
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