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Radstone Technology, the world's leading independent supplier of high-performance, rugged VME-based computer products, announces the ASD-1 sonar I/O board. The ASD-1 is a fully rugged 6U VME ADC/DAC board developed to provide a Commercial-Off-the-Shelf (COTS) solution for sonar I/O. ASD-1 is also suited to seismic / acoustic and other frequency domain applications. The ASD-1's I/O sub-system combines 16 simultaneously sampling 16-bit sigma-delta A/D channels each at up to 195 kHz and 8 simultaneously updating output channels using the latest 16-bit delta-sigma D/A converter technology at up to 108 kHz each. Each of the 16 sigma-delta ADC channels has an AC coupled differential receiver with a fixed gain amplifier set at 1(0dB). (Optionally with a PGA stage providing very powerful optimization of the input dynamic range.) Input Bandwidth is limited by the 64 X oversampling converter technology and a second order Butterworth analog filter on each input. Similarly, each of the 8 delta-sigma DAC outputs provides a 3rd Order Bessel filter for shaping of each output waveform whilst also ensuring a linear phase response. The ASD-1 also provides an embedded sub-system as an intelligent acquisition controller with a message-based interface for command and control, as well as the option for data transfer. The StrongARM( based design is the local PCI arbiter and controls access to the I/O resources. The VME 64 interface is implemented using the industry standard Universe II bridge to the internal PCIbus. A PMC site will enable systems designers to match the ASD-1 to application specific requirements for data transfer and connectivity to the host processor. ASD-1 also integrates with other Radstone computer products via a 32-bit PCI connection via the VME P0 connector. The ASD-1 provides very powerful embedded BIT. The core functionality of the BIT routines is based upon a flexible output loopback scheme, where any output channel may be selected as a test signal injected into all ADC input channels. Further BIT, using an external test signal connected to input channel 16, may be routed to all inputs for verification. Radstone's DSP and Analog I/O Product Manager, Stuart Heptonstall stated: "The ASD-1 is optimized for sonar applications, its use of sigma-delta/delta-sigma technology is highly desirable for sonar I/O." Heptonstall added: "Coupled with Radstone's leading DSP products, the ASD-1 provides an integrated sonar processing solution." - ends -