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DG642DJ Datasheet(PDF) 9 Page - Vishay Siliconix |
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DG642DJ Datasheet(HTML) 9 Page - Vishay Siliconix |
9 / 18 page Document Number: 70058 S11-0154-Rev. F, 31-Jan-11 www.vishay.com 9 Vishay Siliconix DG641, DG642, DG643 APPLICATIONS Board Layout PCB layout rules for good high frequency performance must also be observed to achieve the performance boasted by these analog switches. Some tips for minimizing stray effects are: 1. Use extensive ground planes on double sided PCB, separating adjacent signal paths. Multilayer PCB is even better. 2. Keep signal paths as short as practically possible, with all channel paths of near equal length. 3. Careful arrangement of ground connections is also very important. Star connected system grounds eliminate signal current, flowing through ground path parasitic resistance, from coupling between channels. Figure 8 shows a 4-channel video multiplexer using a DG641. In Figure 9, two coax cables terminated on 75 bring two video signals to the DG642 switch. The two drains tied together lower the on-state capacitance. An Si582 video amplifier drives a double terminated 75 cable. The double terminated coax cable eliminates line reflections. Figure 7. Supply Decoupling + + - 3 V GNDs + 15 V DG64X V+ V- S1 S2 S3 S4 D1 D2 D3 D4 C1 C2 C1 C2 C1 = 10 µF Tantalum C2 = 0.1 µF Ceramic Figure 8. 4 by 1 Video Multiplexing Using the DG641 + - + 15 V V+ V- - 3 V TTL Channel Select A = 2 75 250 Si582 CH1 CH2 CH3 CH4 DG641 DIS 75 75 75 75 250 |
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