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參數資料
| 型號： | LM9833 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | LM9833 48-Bit Color, 1200dpi USB Image Scanner |
| 中文描述： | LM9833 48位彩色，1200dpi的USB圖像掃描儀 |
| 文件頁數： | 28/42頁 |
| 文件大小： | 547K |
| 代理商： | LM9833 |
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Applications Information
(Continued)
To prevent sensor saturation, the LM9833 is always clocking
the CCD/CIS, except when it is in Reset or Standby (Register 7
bit 2 or 3 = 1).
There is a bit for
Fake Optical Black Pixels
(register 19, bit 2).
This is used with Dyna CIS sensors. In this mode, the RS out-
put pulses once inside the TR1 pulse, then is held high until the
end of the optical black pixels. The TR1 pulse is extended until
the trailing edge of the first RS pulse. This mode works for TR1
only, under all TR1 settings (normal and CIS TR1 Timing
modes 1 and 2).
5.3 AFE Operation
The LM9833 supports the following operation modes, controlled
by registers 26 and 27:
3 Channel Pixel Rate Mode. In this mode all three channels are
converted with the multiplexer in front of the ADC switching at
the ADC conversion rate, producing interleaved RGB data that
is transferred to RAM. The ADC runs at MCLK/8, each chan-
nel’s pixel rate is MCLK/24. Each color has its own offset and
gain coefficients. This mode typically uses Illumination Mode 1.
3 Channel Line Rate Mode. In this mode all three channels are
converted with the multiplexer in front of the ADC switching at
the line rate, producing a line of Red data, followed by a line of
Green data, followed by a line of Blue data, etc. that is trans-
ferred to RAM. The selected channel and the ADC both run at
MCLK/8. Each color has its own offset and gain coefficients.
This mode typically uses Illumination Mode 1.
In the 3 Channel Line Rate Mode three TR pulses are generated.
TR
RED
is the TR1 output, TR
GREEN
is the TR2 output, and
TR
BLUE
is the CP2 output. In this mode TR pulses for a particular
color can be “skipped”, increasing the integration time for that
color. In the example shown in Figure 30, the red channel sees 2
times the integration time of the green channel, and the blue
channel sees 3 times the integration time of the green channel.
Each channel can be independently programmed to drop 0, 1, or
2 TR pulses.
Each color’s TR pulse can be programmed to occur in position 1
(inside 1 high) or position 2 (inside 1 low), as shown in Figure
31.
1 Channel Grayscale: Uses the selected channel’s offset and
gain coefficients for all lines. 1 Channel Grayscale is used to
scan a grayscale images. This mode typically uses Illumination
Mode 1 when used with a 3 Channel Color sensor, or Illumina-
tion Mode 3 when used with a 1 Channel sensor.
1 inside TR1 pulse
Figure 26:
CIS TR1 Timing Mode 2
TR1
1
t
1
/4
t
1
/4
t
1
/4
t
1
Figure 27: Fake Optical Black Pixels
Trailing edge of
first RS pulse
End of Optical
Black Pixels
TR1
RS
Red Channel
Figure 28:
3 Channel Pixel Rate Mode
Green Channel
Blue Channel
ADC
C
C
D
ADC Out LIne 1: RGBRGBRGBRGBRGB...
ADC Out LIne 2: RGBRGBRGBRGBRGB...
ADC Out LIne 3: RGBRGBRGBRGBRGB...
Pixel-Rate
Multiplexing
Red Channel
Figure 29:
3 Channel Line Rate Mode
Green Channel
Blue Channel
ADC
C
C
D
ADC Out LIne 1: RRRRRRRRRRRRRRR...
ADC Out LIne 2: GGGGGGGGGGGGGG...
ADC Out LIne 3: BBBBBBBBBBBBBBBBB...
Line-Rate
Multiplexing
Figure 30:
3 Channel Line Rate TR Pulse Timing
TR
RED
TR
GREEN
TR
BLUE
Multiplexer
Red
Green Blue
Red
Green
t
INT (RED)
t
INT (GREEN)
t
INT (BLUE)
TR
RED
TR
GREEN
TR
BLUE
1
1
2
1
2
Figure 31:
3 Channel Line Rate Mode with 2 TR
Pulse Positions
L
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相關代理商/技術參數 |
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| LM9833B-F WAF | 制造商:Texas Instruments 功能描述: |
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| LM9833CCVJD NOPB | 制造商:Texas Instruments 功能描述:Bulk |
| LM9833CCVJD/NOPB | 功能描述:視頻模擬/數字化轉換器集成電路 RoHS:否 制造商:Texas Instruments 輸入信號類型:Differential 轉換器數量:1 ADC 輸入端數量:4 轉換速率:3 Gbps 分辨率:8 bit 結構: 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
| LM98501 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:10-Bit, 27 MSPS Camera Signal Processor |
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