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| DG641 Datasheet, PDF (8/10 Pages) Vishay Siliconix – Low On-Resistance Wideband/Video Switches | |||
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DG641/642/643
Vishay Siliconix
TEST CIRCUITS
RIN
10 W
DG641
S1
D1
S2
D2
S3
D3
S4
D4
Signal
Generator
75 W
V
â1â
(a)
VOUT
RL
75 W
RL
RL
RL
RIN
10 W
DG642
S1
D1
S2
D2
Signal
Generator
75W
V
â0â
(b)
XTALK(AH) + 20
log10
VOUT
V
FIGURE 5. All Hostile Crosstalk â XTALK(AH)
+15 V
VOUT
RL
75 W
RL
Signal
Generator
50 W
V+
S
D
Vâ
RL
50 W
VOUT
â3 V
FIGURE 6. Bandwidth
APPLICATIONS
Device Description
The DG641/642/643 switches offer true bidirectional switching
of high frequency analog or digital signals with minimum signal
crosstalk, low insertion loss, and negligible non-linearity
distortion and group delay.
Built on the Siliconix D/CMOS process, these switches provide
excellent off-isolation with a bandwidth of around 500 MHz.
The silicon-gate D/CMOS processing also yields fast
switching speeds.
An on-chip regulator circuit maintains TTL input compatibility
over the whole operating supply voltage range shown, easing
control logic interfacing.
www.vishay.com S FaxBack 408-970-5600
4-8
Circuit layout is facilitated by the interchangeability of source
and drain terminals.
Frequency Response
A single switch on-channel exhibits both resistance [rDS(on)]
and capacitance [CS(on)]. This RC combination has an
attenuation effect on the analog signal â which is frequency
dependent (like an RC low-pass filter). The â3 dB bandwidth
of the DG641/642/643 is typically 500 MHz (into 50 W).
Document Number: 70058
S-52433âRev. E, 06-Sep-99
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