DG540 TEMICs, DG540 Datasheet

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DG540

Manufacturer Part Number
DG540
Description
Wideband/Video T Switches
Manufacturer
TEMICs
Datasheet

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Description
The DG540/541/542 are high performance monolithic
wideband/video switches designed for switching RF, video
and digital signals. By utilizing a “T” switch configuration
on each channel, these devices achieve exceptionally low
crosstalk and high off-isolation. The crosstalk and
off-isolation of the DG540 are further improved by the
introduction of extra GND pins between signal pins.
Functional Block Diagrams and Pin Configurations
Updates to this data sheet may be obtained via facsimile by calling Siliconix FaxBack, 1-408-970-5600. Please request FaxBack document #70055.
Wideband/Video “T” Switches
GND
GND
GND
Siliconix
S-53694—Rev. E, 28-May-97
Features
IN
IN
V–
D
D
S
S
Wide Bandwidth: 500 MHz
Low Crosstalk: –85 dB
High Off-Isolation: –80 dB @ 5 MHz
“T” Switch Configuration
TTL Logic Compatible
Fast Switching—t
Low r
1
1
1
4
4
4
DS(on)
Dual-In-Line
DG540
: 30
ON
: 45 ns
IN
D
GND
S
V+
GND
S
GND
D
IN
2
3
2
3
2
3
GND
GND
Benefits
V–
S
S
1
4
Flat Frequency Response
High Color Fidelity
Low Insertion Loss
Improved System Performance
Reduced Board Space
Reduced Power Consumption
Improved Data Throughput
DG540
PLCC
To achieve TTL compatibility, low channel capacitances
and fast switching times, the DG540 family is built on the
Siliconix proprietary D/CMOS process. Each switch
conducts equally well in both directions when on.
DG540/541/542
GND
S
V+
GND
S
2
3
Applications
RF and Video Switching
RGB Switching
Local and Wide Area Networks
Video Routing
Fast Data Acquisition
ATE
Radar/FLR Systems
Video Multiplexing
Logic
Logic “0”
0
1
Logic “1”
Logic 1
Truth Table
0.8 V
Switch
2 V
2 V
OFF
ON
1

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DG540 Summary of contents

Page 1

... Improved System Performance Reduced Board Space Reduced Power Consumption Improved Data Throughput To achieve TTL compatibility, low channel capacitances and fast switching times, the DG540 family is built on the Siliconix proprietary D/CMOS process. Each switch conducts equally well in both directions when on. DG540 PLCC ...

Page 2

... OFF Package Part Number 20-Pin Plastic DIP DG540DJ 20-Pin PLCC DG540DN DG540AP 20-Pin Sidebraze 20-Pin Sidebraze DG540AP/883 16-Pin Plastic DIP DG541DJ 16-Pin Narrow SOIC DG541DY DG541AP 16-Pin Sidebraze 16-Pin Sidebraze DG541AP/883 16-Pin Plastic DIP DG542DJ 16-Pin Narrow SOIC ...

Page 3

... Schematic Diagram (Typical Channel) V+ GND V REF IN V– Siliconix S-53694—Rev. E, 28-May-97 DG540/541/542 –0 Power Dissipation (Package)a b 16-Pin Plastic DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0 20-Pin Plastic DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 4

... L L 50% to 90% DG540 Room 20 See Figure 2 DG541 Full Room 25 DG542 Full C = 1000 pF Room –25 See Figure 3 DG540 Room – DG541 Room – MHz MHz DG542 Room –75 See Figure ...

Page 5

... I vs. Temperature S(off 100 125 Temperature ( C) V– Constant V– = – V– = – V– = – – Positive Supply (V) Off Isolation DG540 DG541 10 100 f – Frequency (MHz) 5 ...

Page 6

... Operating Supply Voltage Range 100 125 0 –1 All Hostile Crosstalk DG542 DG541 10 100 f – Frequency (MHz) (DG540/541 OFF 100 125 Temperature ( C) Operating Voltage Area –2 –3 –4 –5 –6 V– – Negative Supply (V) Siliconix S-53694— ...

Page 7

... 2.4 V GND V– – Off Isolation = 20 log Bypass Figure 4. Off Isolation Siliconix S-53694—Rev. E, 28-May-97 DG540/541/542 3 V Logic 50% Input Switch Input Switch 0 Output Figure 2. Switching Time ...

Page 8

... Figure 6. All Hostile Crosstalk an attenuation effect on the analog signal – which is frequency dependent (like an RC low-pass filter). The –3-dB bandwidth of the DG540 is typically 500 MHz (into 50 This measured figure of 500 MHz illustrates that the switch channel can not be represented by a two stage RC combination ...

Page 9

... V– Tantalum 0.1 F Ceramic 2 –3 V Figure 7. Supply Decoupling Board Layout PCB layout rules for good high frequency performance must be observed to achieve the performance boasted by the DG540. Some tips for minimizing stray effects are ...

Page 10

... Applications (Cont’d) Figure 8 shows a 4-channel video multiplexer using a DG540 TTL Channel Select Figure Video Multiplexing Using the DG540 Figure 9 shows an RGB selector switch using two DG542s ...

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