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參數(shù)資料
| 型號： | LM9811CCVF |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | 10-Bit Greyscale/30-Bit Color Linear CCD Sensor Processor |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PQFP52 |
| 封裝： | TQFP-52 |
| 文件頁數(shù)： | 27/36頁 |
| 文件大?。?/td> | 605K |
| 代理商： | LM9811CCVF |
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Applications Information
(Continued)
There are several conditions that can cause the VGA gain
calibration routine to fail. Result 2, “Signal is too strong: De-
crease light intensity or integration time” is shown in Figure
28 This condition indicates that the amplitude of one or
more of the white pixels coming from the CCD is greater than
the maximum input voltage that the LM9811 is capable of ac-
cepting (about 1.2Vp-p). In this case the amplitude of the
analog CCD output must be reduced before it enters the
LM9811’s OS input to prevent clipping. This can be done by
reducing the intensity of the light source or shortening the in-
tegration time of the CCD.
The second possible failure mode of the VGA calibration
(Result 3) occurs if there is “Too much variation” in the ampli-
tude of the pixels coming from the CCD (Figure 29). The
LM9811 can correct for up to a 2.8 to 1 variation in pixel am-
plitude. If the variation is greater than this than it must be re-
duced before it can perform shading correction on all the pix-
els. Typically this is done by using a better light source that
has more uniform illumination, higher quality lenses, or other
opto-mechanical techniques to reduce variation across all
the active pixels.
The final problem that can occur during VGA calibration (Re-
sult 4) is the “Signal too weak: increase light intensity or in-
tegration time” condition, shown in Figure 30 In this case,
DS012813-35
FIGURE 27. VGA Calibration Flowchart
DS012813-36
FIGURE 28. CCD Input Signal Too Strong
DS012813-37
FIGURE 29. CCD Input Signal Range Too Wide
DS012813-38
FIGURE 30. CCD Input Signal Too Weak
www.national.com
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PDF描述 |
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| LM9811 | 10-Bit Greyscale/30-Bit Color Linear CCD Sensor Processor |
| LM9811CCV | 10-Bit Greyscale/30-Bit Color Linear CCD Sensor Processor |
| LM9831CCVJD | LM9831 42-Bit Color, 1200dpi USB Image Scanner |
| LM9831 | LM9831 42-Bit Color, 1200dpi USB Image Scanner |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM9812 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9812 30-Bit Color Linear CCD Sensor Processor |
| LM9812CCV | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9812 30-Bit Color Linear CCD Sensor Processor |
| LM981-SC36 | 功能描述:基本/快動(dòng)開關(guān) Foot Switch RoHS:否 制造商:Omron Electronics 觸點(diǎn)形式:SPDT 執(zhí)行器:Lever 電流額定值:5 A 電壓額定值 AC:250 V 電壓額定值 DC:30 V 功率額定值: 工作力:120 g IP 等級:IP 67 NEMA 額定值: 端接類型:Wire 安裝:Panel |
| LM981-ZZ | 功能描述:基本/快動(dòng)開關(guān) Foot Switch RoHS:否 制造商:Omron Electronics 觸點(diǎn)形式:SPDT 執(zhí)行器:Lever 電流額定值:5 A 電壓額定值 AC:250 V 電壓額定值 DC:30 V 功率額定值: 工作力:120 g IP 等級:IP 67 NEMA 額定值: 端接類型:Wire 安裝:Panel |
| LM981-ZZ-1 | 功能描述:基本/快動(dòng)開關(guān) Foot Switch RoHS:否 制造商:Omron Electronics 觸點(diǎn)形式:SPDT 執(zhí)行器:Lever 電流額定值:5 A 電壓額定值 AC:250 V 電壓額定值 DC:30 V 功率額定值: 工作力:120 g IP 等級:IP 67 NEMA 額定值: 端接類型:Wire 安裝:Panel |
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