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USER’S MANUAL & REFERENCE GUIDE: FFM4027D/Multi
Narragansett Imaging
8
www.nimaging.com
Sensor
Board
Video
Processing
Board
Timing
Board
Power
Board
USB
CameraLink
.
.
.
.
.
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CameraLink
Figure 2. Camera Block Diagram
The Sensor Board includes the CCD sensor, horizontal clock drivers, and adjustments
for sensor bias voltages.
The Video Processing Board has individual analog processing channels for each
output of the CCD. Each channel employs a Philips TDA9965, which provides
correlated-double-sampling (CDS), adjustable gain and offset, and analog-to-digital
conversion (ADC) at 25 MHz. Clock circuitry on the Video Board generates the
camera’s 50 MHz and 25 MHz master clocks and the precisely aligned CDS, ADC and
horizontal clocks. A Philips TDA9991 is used to supply the voltages required by the
sensor and its clock drivers.
The Video Processing Board passes one, two, or four channels of 12-bit video to the
Timing Board. Dense programmable logic on the Timing Board manages the overall
timing of the camera and synchronization with external sources. The logic also
controls the defective column substitution and the in-line look-up tables (LUT). The
LUTs, one per sensor output, allow simple video processing functions such as gamma
correction, sensor output equalization, thresholding, etc. In the case of four channel
operation the Timing Board multiplexes four video channels to two, allowing the use
of a single Camera Link connection.
Processed and multiplexed data from the Timing board passes to the Power Board’s
Camera Link interface. Synchronization signals to/from external equipment are
sent/received via the Power Board, as well.
The following figure illustrates the video processing functions.