21 Piranha2 User’s Manual
Symbol Definition Min (ns) Typ
(ns)
Max
(ns)
twPR_LOW Minimum Low time to assure complete
photosite reset
2,000 +/- 200
tPR_SET The nominal time that the photo sites are
integrating. Clock synchronization will
lead to integration time jitter, which is
shown in the specification as +/- values.
The user should command times greater
than these to ensure proper charge
transfer from the photosites. Failure to
meet this requirement may result in
blooming in the Horizontal Shift Register.
2,000+/-200
*SMART EXSYNC refers to exposure mode 4. Refer to section 3.9 Setting Line Rate and
Exposure Mode for further information on exposure modes.
Table 7: Piranha2 30MHz Timing (Fixed Integration Mode)
Note: All values are preliminary for the Piranha2 30MHz
Symbol Definition Min (ns) Typ
(ns)
Max
(ns)
twSYNC The minimum low width of the EXSYNC
pulse when not in SMART EXSYNC
mode.
132
twSYNC
(SMART)
*
The minimum low width of the EXSYNC
pulse when in SMART EXSYNC modes to
guarantee the photosites are reset.
2,640
twSYNC_INT The minimum width of the high pulse
when the “SMART EXSYNC” feature is
turned off
132
twSYNC_INT
(SMART)
*
Is the integration time when the “SMART
EXSYNC” feature is available and turned
on. Note that the minimum time is
necessary to guarantee proper operation.
2,000
tLINE PERIOD
(t
LP
)
The minimum and maximum line times
made up of tTransfer, tREADOUT plus
tOVERHEAD to meet specifications.
140487 (8K2T)
70,170 (4K2T)
36,378 (2K2T)
19,483 (1K2T)
10
6
tTransfer The time from the reception of the falling
edge of EXSYNC to the rising edge of
LVAL when pretrigger is set to zero.
Pretrigger reduces the number of clocks to
the rising edge of LVAL but doesn’t
change the time to the first valid pixel. If
the fixed integration time mode of
operation is available and selected then
the integration time is added to the
specified value.
1,874 +/-66
twFixed Int. Fixed Integration Time mode of operation
for variable exsync frequency.
800 t
LP
–
2,000
03-32-00493-11 DALSA
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