Rev. 3.00 R L VRT VRB VDD XRD9827 CLAMP RINT RED M U X C I S REXT CEXT N/C Therefore, Tc =1/R INT
參數資料
型號: XRD9827ACU
廠商: Exar Corporation
文件頁數: 9/36頁
文件大小: 0K
描述: IC 12B CCD/CIS SIG PROC 20SSOP
產品變化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
標準包裝: 66
位數: 12
通道數: 3
電壓 - 電源,模擬: 3 V ~ 5.5V
電壓 - 電源,數字: 3 V ~ 5.5 V
封裝/外殼: 20-SSOP(0.209",5.30mm 寬)
供應商設備封裝: 20-SSOP
包裝: 管件
XRD9827
17
Rev. 3.00
R
L
VRT
VRB
VDD
XRD9827
CLAMP
RINT
RED
M
U
X
C
I
S
REXT CEXT
N/C
Therefore, Tc =1/R
INTCEXT
If the input to the external capacitor has a source
impedance (R
EXT), then:
T
c=1/(RINT+REXT)CEXT
This value corresponds to the black reference of the
image sensor. When the CLAMP pin is set back to low,
the ADC samples the video signal with respect to the
black reference. The typical value for the external
capacitor is 100pF. This value should be adjusted
according to the time constant (Tc) needed in a particu-
lar application. The CLAMP pin has an internal 150 ohm
impedance (R
INT) which is in series with the external
capacitor (C
EXT).
Figure 7. CIS AC Coupled Application
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