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(shù)資料
型號(hào)： XRD9827EVAL
廠商： Exar Corporation
文件頁(yè)數(shù)： 9/36頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XRD9827
標(biāo)準(zhǔn)包裝： 1
系列： *
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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