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DG642DJ Datasheet(PDF) 9 Page - Vishay Siliconix

Part # DG642DJ
Description  Low On-Resistance Wideband/Video Switches
Download  18 Pages
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Manufacturer  VISHAY [Vishay Siliconix]
Direct Link  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

DG642DJ Datasheet(HTML) 9 Page - Vishay Siliconix

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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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