參數(shù)資料
型號： XRD98L62
廠商： Exar Corporation
英文描述： CCD Image Digitizers with CDA，PGS and 12-Bit A/D(CCD圖像數(shù)字轉(zhuǎn)換器（帶CDA，PGS和12位A/D轉(zhuǎn)換器）)
中文描述： 與綜合發(fā)展區(qū)，和12的PGS CCD圖像數(shù)字轉(zhuǎn)換器，位A / D（防治荒漠化公約圖像數(shù)字轉(zhuǎn)換器（帶地帶素類和12位的A / D轉(zhuǎn)換器））
文件頁數(shù)： 22/37頁
文件大?。?/td> 394K
代理商： XRD98L62
XRD98L62
22
Rev. P2.00
Preliminary
To get the maximum color resolution and dynamic
range, the XRD98L62 uses a digitally controlled cali-
bration circuit to correct for offset in the CCD signal as
well as offset in the CDS, PGA & ADC signal path. This
calibration is done while the CCD outputs Optical
Black (OB) pixels. In the “l(fā)ine” timing mode, the OB
pixels at the start or end of each scan line are used for
calibration.
Hot Pixel Clipper
CCD’s occasionally have hot pixels. These are defec-
tive pixels, which always output a bright level. To
ensure the Black Level is not affected by hot pixels in
the OB area, the Hot Pixel Clipper limits pixel data from
the ADC to a maximum value of 511 (1FFh). This
clipping only affects the data used by the internal
calibration logic. Data on the ADC output bus,
DB[11:0], is not clipped.
ADC Data
C
0
4096
2048
511
0
511
4096
Figure 9. Hot Pixel Clipper
Pixel Averager
After the clipper, the logic takes an average of Optical
Black pixels. The number of pixels to be averaged can
be selected as one of the following 4, 8, 16, 32, 64, 128,
256, or 512. The AVG[2:0] bits in the Calibration
register are used to program the number of pixels to
average. This averaging function filters out noise and
prevents image artifacts. The calibration logic will
average OB pixels over as many lines as required to
get the programmed number of pixels to average.
AVG[2]
AVG[1]
AVG[0]
# of Pixels
to Average
4
8
16
32
64
128
(default)
256
512
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
1
1
1
1
0
1
Table 3. Programming the Pixel Averager
Offset Difference
Next, the Offset register value, OB[7:0], is subtracted
from the OB pixel average. If the difference is positive,
the offset DACs are adjusted to reduce the effective
ADC output code. If the difference is negative, the
offset DACs are adjusted to increase the effective
ADC output code. The FAST_CAL and DNS options
will affect how the DAC adjustments are made.
Coarse & Fine Accumulators
The Coarse and Fine Accumulators are the registers
which hold the digital codes for the Coarse and Fine
Offset DACs. The Offset DAC adjustments are made
by adding or subtracting to the value in the Fine
accumulator. If there is an overflow or underflow in the
Fine Accumulator, the Fine Accumulator is reset to it’s
mid-scale value, and the Coarse Accumulator is
incremented or decremented accordingly.
相關(guān)PDF資料
PDF描述
XRDAN28 Frequency Response Effects of Overampling and Averaging on A/D Output Data
XRDAN29 Criteria for Accurate Sampling of Analog Signals
XRDAN30 CMOS Current Output D/A Converter Design Concepts for Wide Bandwidth Applications
XRK32308_07 3.3V ZERO DELAY BUFFER
XRK32308CD-1 3.3V ZERO DELAY BUFFER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRD98L62ACV 制造商:EXAR 制造商全稱:EXAR 功能描述:CCD Image Digitizers with CDS, PGA and 12-Bit A/D
XRD98L62ACV-F 功能描述:視頻 IC RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
XRD98L62EVAL 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 XRD98L62 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
XRD98L62ZEVAL 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 Eval Board (Solder) XRD98L62AIV RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
XRD98L63 制造商:EXAR 制造商全稱:EXAR 功能描述:CCD Image Digitizers with CDS, PGA and 12-Bit A/D
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