參數(shù)資料
型號(hào): XRD9827ACU
廠商: EXAR CORP
元件分類: 模擬信號(hào)調(diào)理
英文描述: 12-Bit Linear CIS/CCD Sensor Signal Processor with Serial Control
中文描述: SPECIALTY ANALOG CIRCUIT, PDSO20
封裝: 5.30 MM, SSOP-20
文件頁(yè)數(shù): 8/32頁(yè)
文件大?。?/td> 264K
代理商: XRD9827ACU
XRD9827
8
Rev. 1.20
THEORY OF OPERATION
CIS Configuration (Contact Image Sensor)
The XRD9827 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
XRD9827 input.
Optically Shielded
Pixels
Valid Pixels
Adjust the offset of the CIS (-100 mV to 500 mV) by setting the internal registers of the XRD9827 to set the black
pixel value when the LEDs of the CIS are off. When the LEDs are on, use the XRD9827 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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