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参数资料
| 型号： | XRD98L62EVAL |
| 厂商： | Exar Corporation |
| 文件页数： | 15/37页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD XRD98L62 |
| 标准包装： | 1 |
| 系列： | * |
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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 “line” 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRD98L62ZEVAL | 功能描述:数据转换 IC 开发工具 Eval Board (Solder) XRD98L62AIV RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| XRD98L63 | 制造商:EXAR 制造商全称:EXAR 功能描述:CCD Image Digitizers with CDS, PGA and 12-Bit A/D |
| XRD98L63AIV | 制造商:EXAR 制造商全称:EXAR 功能描述:CCD Image Digitizers with CDS, PGA and 12-Bit A/D |
| XRD98L63AIV-F | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| XRD98L63AIVTR-F | 制造商:Exar Corporation 功能描述:AFE General Purpose 1ADC 12-Bit 3V 48-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XRD98L63AIVTR-F |
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