參數(shù)資料
型號(hào)： AD9925BBCZ
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： CCD Signal Processor with Vertical Driver and Precision Timing Generator
中文描述： SPECIALTY CONSUMER CIRCUIT, PBGA96
封裝： 8 X 8 MM, 0.65 MM PITCH, LEAD FREE, PLASTIC, CSBGA-96
文件頁(yè)數(shù)： 36/96頁(yè)
文件大?。?/td> 1447K
代理商： AD9925BBCZ
AD9925
SHUTTER TIMING C
The CCD image exposure time is controlled by the substrate
clock signal (SUBCK), which pulses the CCD substrate to clear
out accumulated charge. The AD9925 supports three types of
electronic shuttering: normal, high precision, and low speed.
Along with the SUBCK pulse placement, the AD9925
commodate different readou
the SUBCK pulses during multiple field readouts. The AD9925
also provides programmable outputs to control an external
chanical shutter (MSHUT), a strobe/flash (STROBE), and the
CCD bias select signal (VSUB).
Normal Shutter Operation
By default, the AD9925 always op
configuration, in which the SUBCK signal pulses in every VD
field (see Figure 45). The SUBCK pulse occurs once per line,
and the total number of repetitions within the field will deter-
mine the length of the exposure time. The SUBCK pulse polar-
ity and toggle positions within a line are programmable using
the SUBCKPOL and SUBCK1TOG registers (see Table 19). The
number of SUBCK pulses per field is programmed in the
SUBCKNUM register (Addr 0x63).
Rev. A | Page 36 of 96
ONTROL
can ac-
t configurations to further suppress
me-
erates in the normal shutter
ield. The SUBCKPOL,
alues section.
l
FF)
eration
precision shutter operations are used when
Normal and high
the exposure time is less than one field long. For exposure time
longer than one field interval, low speed shutter operation is
used. The AD9925 uses a separate exposure counter to achieve
long exposure times. The number of fields for the low speed
shutter operation is specified in the EXPOSURE register
(Addr 0x62). As shown in Figure 47, this shutter mode will
suppress the SUBCK and VSG outputs for up to 4095 fields (VD
periods). The V
exposure period by programming the VDHDOFF register to 1.
s
D and HD outputs may be suppressed during the
R
this bit is set high, at the next VD edge,
re operation. If a value greater
r
As shown in Figure 45, the SUBCK pulses will always begin
in the line following the SG active line, which is specified
in the SGACTLINE registers for each f
SUBCK1TOG, SUBCK2TOG, SUBCKNUM, and SUBCKSUP-
PRESS registers are updated at the start of the line after the sensor
gate line, as described in the Updating New Register V
VD
High Precision Shutter Operation
High precision shuttering is used in the same manner as norma
shuttering, but it uses an additional register to control the last
SUBCK pulse. In this mode, the SUBCK still pulses once per
line, but the last SUBCK in the field will have an additional
SUBCK pulse, the location of which is determined by the
SUBCK2TOG register, as shown in Figure 46. Finer resolution
of the exposure time is possible using this mode. Leaving the
SUBCK2TOG register set to its maximum value (0xFF FF
will disable the last SUBCK pulse (default setting).
Low Speed Shutter Op
To generate a low speed shutter operation, it is necessary to
trigger the start of the long exposure by writing to the TRIGGE
Register Bit D3. When
the AD9925 will begin an exposu
than 0 is specified in the EXPOSURE register, AD9925 will
suppress the SUBCK output on subsequent fields.
If the exposure is generated using the TRIGGER register and
the EXPOSURE register is set to 0, then the behavior of the
SUBCK will not be any different than that of normal shutter o
high precision shutter operations, in which the TRIGGER regis-
ter is not used.
SUBCK
SUBCK PROGRAMMABLE SETTINGS:
1. PULSE POLARITY USING THE SUBCKPOL REGISTER.
2. NUMBER OF PULSES WITHIN THE FIELD USING THE SUBCKNUM REGISTER (SUBNUM = 3 IN THE ABOVE EXAMPLE).
3. PIXEL LOCATION OF PULSE WITHIN THE LINE AND PULSE WIDTH PROGRAMMED USING SUBCK1 TOGGLE POSITION REGISTER.
t
EXP
XSG
t
EXP
0
Figure 45. Normal Shutter Mode
HD
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