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Video Crossbar Switch DG884 Simplifies Design of Low-Distortion Broadband Crossbar Systems

2013-09-22
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The DG884 is a digitally selectable eight-input to four-output monolithic bidirectional crosspoint IC suitable for wideband analog and digital signal routing. Wideband here is used to define signals with bandwidths in the range of 60 to 200 MHz.Fabricated with the Vishay Siliconix D/CMOS technology, theDG884 incorporates n-channel DMOS switching FETs with low-power CMOS control logic, drivers, and latches. The low-capacitance DMOS FETs are connected as lowon-resistance T-switches to achieve high levels of off-isolation and low levels of crosstalk. On-chip TTL-compatible address latches and data readback are included to simplify microprocessor interfacing. Double buffering of the switchaddressing allows update information to be loaded without affecting the existing state of the crosspoint. A single SALVO command is all that is required to transfer previously set information to the current event latches. This single command significantly speeds up the setup time, especially in largematrices requiring more than one DG884.

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