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AD9925
Rev. 0 | Page 38 of 96
SUBCK Suppression
Normally, the SUBCKs will begin to pulse on the line following
the sensor gate line (VSG). With some CCDs, the SUBCK pulse
needs to be suppressed for one or more lines following the VSG
line. The SUBCKSUPPRESS register allows for the suppression
of the SUBCK pulses for additional lines following the VSG line.
Readout after Exposure
After the exposure, the readout of the CCD data occurs, begin-
ning with the sensor gate (VSG) operation. By default, the
AD9925 is generating the VSG pulses in every field. In the case
where only a single exposure and single readout frame is
needed, such as the CCD’s preview mode, the VSG and SUBCK
pulses can operate in every field.
However, in many cases, during readout the SUBCK output
needs to be further suppressed until the readout is completed.
The READOUT register specifies the number of additional
fields after the exposure to continue the suppression of SUBCK.
READOUT can be programmed for 0 to 7 additional fields and
should be preprogrammed at start-up, not at the same time as
the exposure write. A typical interlaced CCD frame readout
mode will generally require two additional fields of SUBCK
suppression (READOUT = 2). A 3-field, 6-phase CCD will
require three additional fields of SUBCK suppression after the
readout begins (READOUT = 3).
If the SUBCK output is required to start back up during the last
field of readout, simply program the READOUT register to one
less than the total number of CCD readout fields.
Like the exposure operation, the readout operation must be
triggered by using the TRIGGER register.
Using the TRIGGER Register
As described above, by default, the AD9925 will output the
SUBCK and VSG signals on every field. This works well for
continuous single field exposure and readout operations, such
as the CCD’s live preview mode. However, if the CCD requires a
longer exposure time, or if multiple readout fields are needed,
the TRIGGER register is needed to initiate specific exposure
and readout sequences.
Typically, the exposure and readout bits in the TRIGGER regis-
ter are used together. This will initiate a complete exposure-plus
readout operation. Once the exposure has been completed, the
readout will automatically occur. The values in the EXPOSURE
and READOUT registers will determine the length of each
operation.
It is possible to independently trigger the readout operation
without triggering the exposure operation. This will cause the
readout to occur at the next VD, and the SUBCK output will be
suppressed according to the value of the READOUT register.
The TRIGGER register is also used to control the STROBE,
MSHUT, and VSUB signal transitions. Each of these signals is
individually controlled, although they will be dependent on the
triggering of the exposure and readout operation.
See Figure 49 for a complete example of triggering the exposure
and readout operations.
VSUB Control
The CCD readout bias (VSUB) can be programmed to accom-
modate different CCDs. Figure 48 shows two different modes
that are available. In Mode 0, VSUB goes active during the field
of the last SUBCK when the exposure begins. The on position
(rising edge in Figure 48) is programmable to any line within
the field. VSUB will remain active until the end of the image
readout. In Mode 1, the VSUB is not activated until the start of
the readout.
An additional function called VSUB keep-on is also available.
When this bit is set high, the VSUB output will remain on
(active) even after the readout has finished. To disable the VSUB
at a later time, set this bit back to low.
MSHUT and STROBE Control
MSHUT and STROBE operation is shown in Figure 49, Figure 50,
and Figure 51. Table 20 shows the registers parameters for con-
trolling the MSHUT and STROBE outputs. The MSHUT output
is switched on with the MSHUTON registers, and it will remain
on until the location specified in the MSHUTOFF registers. The
location of MSHUTOFF is fully programmable to anywhere
within the exposure period, using the FD (field), LN (line), and
PX (pixel) registers. The STROBE pulse is defined by the on and
off positions. STROBON_FD is the field in which the STROBE
is turned on, measured from the field containing the last
SUBCK before exposure begins. The STROBON_ LN PX regis-
ter gives the line and pixel positions with respect to STRO-
BON_FD. The STROBE off position is programmable to any
field, line, and pixel location with respect to the field of the last
SUBCK.