Operating Modes
The TM-250/TM-260 operates in the following modes that
can be selected by the DIP switch on the rear panel of the
camera.
1 Standard interlace Mode
Field integration Mode
Frame integration Mode
2 External Sync Mode
3 Noninterlace Mode
4 Cyclic (continuous) Shutter Mode
5 Asynchronous Reset and Asynchronous Shutter
6 Reset-Restart Mode
Frame integration Mode
Field integration Mode
7 Reset-Restart Mode with Electronic Shutter
Frame integration Mode
Field integration Mode
8 Integration Mode (Strobe application)
1. Standard Interlace Mode
Field Mode and Frame Mode
The field and frame integration mode is selectable.The
frame integration is used to separate all CCD pixels and the
exposure of Odd and Even fields generate full frame image
shown in the figure below.
Field Mode Binning
The field integration is done by combining two pixel rows
(binning) together and each pair alternates as interlace scan is
generated. Row 1 is binned with row 2, and row 3 is binned
with row 4. In Field 2, row 2 is binned with row 3, row 4 with
row 5, and so on.The field mode is very effective in shutter
mode since the pixel sensitivity is doubled for field integration
(1/60 sec) and equals with frame mode (one row at 1/30 sec).
Since shutter mode is only one field output per shutter and
darker than normal image, two-row binning is effective.This
mode also reduces interlace moire when a sharp horizontal
pattern is observed. For higher pixel definition such as gauging
and sub-pixel interpolation, Frame mode operation is recom-
mended.
2. External Sync Mode
TM-250 / TM-260 accepts standard RS-170 external sync,
which is defined as horizontal sync (HD) and vertical sync
(VD).The phase-locked loop jitter is designed to be the mini-
mum (< 5ns) in this category using the latest PLL chip.The
wide capture range enables the camera to operate at an
extended temperature range (optional) of -35°C to 65°C. HD
and VD input is TTL level and the high impedance is (4.7KΩ)
or 75Ω (optional).
3. Non-Interlace Operation Mode
With external sync of non-interlace, the camera operates at
noninterlace scanning. External VD must be generated at inte-
ger of 262H ± 8H. (Standard interlace is 262.5 H)
4. Cyclic (Continuous) Shutter Mode
With back-plate shutter control,TM-250 / TM-260 operates at
the internally predefined shutter speeds. Each field output is
exposed for the same period.The shutter control varies the
substrate discharge timing.The duration between the shutter
pulse and transfer gate timing (11H* from VD edge) decides
the exposure time. (*16H for CCIR)
www.pulnix.com
TM-250/260 High-Resolution Miniature CCD Camera
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