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參數資料
| 型號： | XRD9853AIV |
| 廠商： | EXAR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | CCD Image Digitizers with CDS, PGA, and 10-bit A/D |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, TQFP-48 |
| 文件頁數： | 8/32頁 |
| 文件大?。?/td> | 193K |
| 代理商： | XRD9853AIV |
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XRD9824
8
Rev. 2.10
THEORY OF OPERATION
CIS Configuration (Contact Image Sensor)
The XRD9824 has two configurations for CIS applications. Each configuration is set by the control registers
accessed through the serial port.
Mode 1. DC Coupled
If the CIS does not have leading or trailing black pixels as shown in Figure 2, then DC couple the CIS output to the
XRD9824 input.
Optically Shielded
Pixels
Valid Pixels
Adjust the offset of the CIS (-100 mV to 500 mV) by setting the internal registers of the XRD9824 to set the black
pixel value when the LEDs of the CIS are off. When the LEDs are on, use the XRD9824 Programmable Gain to
maximize the ADCs dynamic range. Figure 3 shows a typical application for a CIS with an offset of -100mV to
500mV.
Figure 2. Typical Output CIS Mode
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