Controller Boards

ARC-22 - 250 MHz Fiber Optic Timing Board

The 250 MHz fiber optic timing board performs three main functions communicating between the controller and the host computer, generating timing waveforms and providing overall controller supervision. It has a duplex fiber optic link to a PCI interface board, the ARC-64, that operates at a bit rate of 250 MHz, providing a sustained maximum image data transfer rate of 12.5 Mpixels per second. It controls the timing of the analog portions of the controller by writing 16-bit digital words as often as every 40 nanoseconds over a backplane to other controller boards. It performs such supervisory functions as exposure timing, power sequencing, controlling a shutter, and synchronizing operations with signals external to the controller using the Motorola DSP56003 Digital Signal Processor, operating at an internal clock speed of 100 MHz.

   Users' ManualSchematicLayout

ARC-32 - IR and CCD Clock Driver Board

The clock driver board translates digital input signals into analog output signals for direct connection to CCD and infrared arrays. It provides 24 clock signals, each of which has programmable high and low voltages. Their rise and fall times can be adjusted by inserting resistors and capacitors in the output circuit. This board will drive up to +/- 13 volts for operating CCD arrays, or lower unipolar voltages for operating IR arrays.

   Users' ManualSchematicLayout

ARC-50 - Utility Board

The utility board provides support functions that are not directly involved with the readout of imaging arrays. These include exposure timing, sensor temperature control, shutter control, and system voltage monitoring. Based around a Motorola DSP56001 microprocessor, the board can be programmed by the user to support additional functions using the large number of general purpose analog and digital I/O channels.

   Users' ManualSchematicLayout

ARC-64 - 250 MHz PCI Interface Board

The 250 MHz PCI interface board provides communication and data transfer between the host computer and the controller. Connection to the controller is via a fiber optic cable, which provides a maximum sustained data transfer rate of 12.5 Megapixels/second. Drivers are available for installing it in Sun Solaris, Red Hat Linux and Windows operating systems. It writes large images directly to system memory using a DMA capability. It can be used in PCI backplanes that supply either 3.3 or 5 volt power.

   Users' ManualSchematicLayout

ARC-65 - 250 MHz PMC Mezzanine Board

PMC is an acronym for PCI Mezzanine Card, and can be used as a daughter board on CPUs in real-time or embedded systems, such as VME or PXI bus systems. This board has nearly the same circuit as the ARC65 but has a different form factor and connectors.

   Users' ManualSchematicLayout

ARC-73 - Power Control Board

The power control board monitors incoming power for under or over voltages. The board turns on and off the analog voltages (+36, 16.5, 6.5) from the power supplies to the backplane.