Rev. 3.00 THEORY OF OPERATION CIS Configuration (Contact Image Sensor) The XRD9827 has two configurations for CIS applications. Each" />
參數(shù)資料
型號(hào): XRD9827ACU
廠商: Exar Corporation
文件頁(yè)數(shù): 4/36頁(yè)
文件大?。?/td> 0K
描述: IC 12B CCD/CIS SIG PROC 20SSOP
產(chǎn)品變化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
標(biāo)準(zhǔn)包裝: 66
位數(shù): 12
通道數(shù): 3
電壓 - 電源,模擬: 3 V ~ 5.5V
電壓 - 電源,數(shù)字: 3 V ~ 5.5 V
封裝/外殼: 20-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 20-SSOP
包裝: 管件
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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