參數(shù)資料
型號(hào): XRD9825ACU
廠商: Exar Corporation
文件頁(yè)數(shù): 5/33頁(yè)
文件大?。?/td> 0K
描述: IC 16B 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): 16
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
XRD9825
13
Rev. 1.00
Figure 7. CIS AC Coupled Application
Mode 2. AC Coupled
If the CIS signal has a black reference for the video
signal, an external capacitor C
EXT is used.
When
CLAMP (clamp) pin is set high an internal switch allows
one side of the external capacitor to be set to ground.
It then is level shifted to correspond to the bottom ladder
reference voltage of the ADC (Figure 7).
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
RL
VRT
VRB
VDD
XRD9825
CLAMP
RINT
RED
M
U
X
C
I
S
REXT CEXT
N/C
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).
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
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