参数资料
型号: XRD9827EVAL
厂商: Exar Corporation
文件页数: 4/36页
文件大小: 0K
描述: EVAL BOARD FOR XRD9827
标准包装: 1
系列: *
XRD9827
12
Rev. 3.00
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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