This site maintained by Deb Culmer,
Last update: November 5, 2002



Power supply

        14 rack mount chassis 4 inches high, XX deep.
        Power supplies: Linear +15v, -15v, and +24v supplies for low noise operation of the analog signal processing circuitry, and switching +5v for low power consumption.
        Total power utilization in the prototype camera has been measured at:

o       +5V 2.5A for TE cooler, 0.9A for electronics
o       +15V 200mA
o       -15V 150ma
o       +24V 3ma


        20 long power supply cable with a 16-pin connector.
        RS232 serial interface cable with a 9-pin D-sub connector for command level communication with the camera.
        A fiber-optic cable transmits the digital video output signal.

Camera Electronics

        All camera head electrical connections are through a 41-pin hermetic bulkhead connector.
        Circuit boards (3.75 X 8 inches or smaller)

o       Digital control and timing generation
o       D/A voltage converters and CCD clock drivers
o       Analog processing
o       A/D converters and optical fiber interface
o       A second analog processing board can be added to provide dual-channel CCD readout for higher speed

        8051 microprocessor for command and control with RS232 interface to one of the Observatory workstation computers
        PLDs from Xilinx:

o       Clock timing generation and readout control
o       Control of digital video output on fiber optic cable
o       Digital image sampling for high-speed background measurement

        Non-volatile static memory (NVRAM, Simtek STK10C68)
        Analog electronics for CCD operation and video processing:

o       16 digitally programmed CCD voltages with power-on delay protection. Some of the voltages have multiple output current buffers for driving large loads
o       Double correlated sampling amplifier for slow-scan low-noise mode and single sampling for higher speed modes
o       16-bit A/D video conversion