- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361035 > LM9811 (National Semiconductor Corporation) 10-Bit Greyscale/30-Bit Color Linear CCD Sensor Processor PDF資料下載
參數(shù)資料
| 型號(hào)： | LM9811 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 10-Bit Greyscale/30-Bit Color Linear CCD Sensor Processor |
| 中文描述： | 10位Greyscale/30-Bit彩色線陣CCD傳感器處理器 |
| 文件頁數(shù)： | 31/36頁 |
| 文件大?。?/td> | 605K |
| 代理商： | LM9811 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁當(dāng)前第31頁第32頁第33頁第34頁第35頁第36頁
Applications Information
(Continued)
Since this is a CCD sensor, the Signal Polarity is set to a 1
(inverted) to match the CCD’s output signal. The number of
dummy pixels and optical black reference pixels are given in
the CCD’s datasheet. The dummy pixel register should be
programmed with the number of dummy pixels in the CCD +
1 (for example, if the CCD has 16 dummy pixels then the
register should contain 17). The optical black reference reg-
ister should be programmed with the number of optical black
pixels in the CCD.
The PGA gain coefficient register and PGA Gain Source bit
are used during calibration (see Section 5.0). The Power
Down bit should be set to 0 for normal operation. The Offset
Add bit is also programmed during calibration.
The VGA and Offset DAC bits are programmed during cali-
bration (Section 5.0). The Test Mode bits should always be
set to “0”.
9.0 TYPICAL CIS APPLICATION
Many CIS sensors (such as those made by Dyna Image Cor-
poration) have only one clock input, a transfer signal, and an
output signal that is referred to ground (Figure 37). Figure 38
shows the analog and digital circuitry required to connect a
typical Dyna CIS to the LM9811.
Because the CIS requires only one clock with a duty cycle of
less than 50%, the LM9811’s RS output is used as the CIS’s
CLK source.
φ
1 and
φ
2 are not used. The 74HC74 D flip-flop
is used to lengthen the transfer pulse (SI, or “Shift In” on the
CIS) so that it overlaps the first RS pulse and meets the tim-
ing requirement of the CIS (see Figure 39).
The final “trick” required to interface a CIS to the LM9811 is
the generation of optical black pixels for the LM9811 to
clamp to at the beginning of a line. Unlike CCDs, CIS de-
vices do not have a sequence of optical black pixels at the
beginning of a line— the first pixel out of a CIS is valid image
data. There are several ways to create black pixels for the
LM9811 to clamp to.
The simplest solution is to physically place a light shield
(black plastic, tape or metal) over the first 10 or so pixels.
This reduces the voltage output of the CIS to nearly 0V,
which is adequate for the LM9811 to clamp to. This has the
side effect of slightly reducing the number of active pixels
available for image capture.
A second option is to artifically generate “black” pixels by
holding the CLOCK input high for 10 or so RS pulses (Figure
40). This forces the output voltage to zero for the time that
the CLOCK input is high, and only one active image pixel is
lost. The BLACK signal could be generated by the ASIC/
external logic that generates a pulse on the first rising edge
of RS after the TR pulse.
Suggested timing for CIS devices is:
Mode = 0 (Standard Mode)
*
RS Pulse Width = 0 (2 MCLKs)
DS012813-45
FIGURE 37. CIS Waveforms
DS012813-46
FIGURE 38. Minimum CIS Interface
DS012813-47
FIGURE 39. CIS Interface Digital Timing
DS012813-48
FIGURE 40. Generating Artificial Black Pixels
www.national.com
31
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| LM9831CCVJDX | LM9831 42-Bit Color, 1200dpi USB Image Scanner |
| LM9832CCVJD | LM9832 42-Bit Color, 1200dpi USB Image Scanner |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM9811CCV | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:10-Bit Greyscale/30-Bit Color Linear CCD Sensor Processor |
| LM9811CCVF | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:10-Bit Greyscale/30-Bit Color Linear CCD Sensor Processor |
| 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(jí):IP 67 NEMA 額定值: 端接類型:Wire 安裝:Panel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。