Preliminary To get the maximum color resolution and dynamic range, the XRD98L62 uses a digitally controlled cali- bratio" />
參數(shù)資料
型號： XRD98L62ACV-F
廠商： Exar Corporation
文件頁數(shù)： 15/37頁
文件大?。?/td> 0K
描述： IC CCD DIGITIZER 12BIT 48TQFP
標(biāo)準(zhǔn)包裝： 250
位數(shù)： 12
通道數(shù)： 1
電壓 - 電源，模擬： 2.7 V ~ 3.6 V
電壓 - 電源，數(shù)字： 2.7 V ~ 3.6 V
封裝/外殼： 48-TQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（7x7）
包裝： 托盤
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
Clipper
Output
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
000
4
001
8
010
16
011
32
100
64
101
128
(default)
110
256
111
512
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.
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參數(shù)描述
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
XRD98L63AIV 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
XRD98L63AIV-F 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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