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Manufactured byDatel
Product groupModules
DescriptionDatel DVME-622SRC Setup/Configuration, Source Disk, MS-DOS CompatibleFeatures 8 or 16 analog outputs 12-bit D/A resolution 3 microsecond settling time Simultaneous update Trigger timer Interrupt Digital I/O (4-in, 3-out) Output ranges selectable per channelMany applications require phase-synchronous analog outputs. Examples include precision system simulation and coherent field generation in process control, audio, acoustics and sonar. The DVME-622 is a high density analog output board with up to 16 signal channels. Each Digital to Analog Converter (DAC) channel may be individually selected for full scale output ranges of 0 to +5V, 0 to +10V, ±5V, ±10V, or ±2.5V. All outputs are buffered and will deliver ±0.025% accuracy from 0 to 5 milliamps output load. The DVME-622 is installed in a host VMEbus computer.To achieve the simultaneous update capability, each channel input register is double buffered. The registers are successively loaded by the host computer then all channels are updated by host command or trigger. If preferred, each channel may also be operated in the non-concurrent transparent mode under program control with random addressing or single channel operation.For applications requiring a precision clock to sequence the output waveforms, the DVME-622 includes a softwareprogrammable trigger. The trigger strobes the simultaneous update and posts a status bit or interrupt to the host computer. Upon detecting the trigger, the host may block-load the next data frame. The trigger may be derived from an internal crystal-stabilized timer or from an external timebase. The external trigger and external clock options make the DVME-622 fully synchronous with external events. The timing section also includes a spare counter, usable for any purpose.For repeating frame scan applications, the DVME-622 includes an auto-increment mode. In this mode, memory block transfer instructions will automatically load up to 16 channels at very high speed from a buffer in the host. The DVME-622 will digitally steer each analog data word to successive DAC input registers while using the same memory data register address. The user's program simply maintains a CPU register as a down counter to terminate each block transfer. Typically, the trigger and auto-increment modes are used together where the host loads the next block after detecting the trigger status signal from the last simultaneous update.The combination of a precision frame clock trigger, auto-increment channel addressing and high speed simultaneous block loading make the DVME-622 ideal for artificial waveform applications. Such waveform generators continuously loop through a large RAM buffer containing a synthetic composite digitized analog signal.
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Datel
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