This site maintained by
Deb Culmer, firstname.lastname@example.org
Last update: November 5, 2002
· 14” rack mount chassis 4 ½ 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:
+5V 2.5A for TE cooler, 0.9A for electronics o
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.
· 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