DG540 TEMICs, DG540 Datasheet - Page 9

• Manufacturer Part Number: DG540
• Description: Wideband/Video T Switches
• Manufacturer: TEMICs

Applications (Cont’d)
Power Supplies
A useful feature of the DG54X family is its power supply
flexibility. It can be operated from a single positive supply
(V+) if required (V– connected to ground).
Note that the analog signal must not exceed V– by more
than –0.3 V to prevent forward biasing the substrate p-n
junction.
advantages:
Decoupling
It is an established RF design practice to incorporate
sufficient bypass capacitors in the circuit to decouple the
power supplies to all active devices in the circuit. The
dynamic performance of the DG54X is adversely affected
by poor decoupling of power supply pins. Also, of even
more significance, since the substrate of the device is
connected to the negative supply, adequate decoupling of
this pin is essential.
Rules:
Siliconix
S-53694—Rev. E, 28-May-97
The use of a V– supply has a number of
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:
C
C
1
2
= 10 F Tantalum
= 0.1 F Ceramic
S
S
S
S
1
2
3
4
Figure 7. Supply Decoupling
DG540/541/542
–3 V
V+
V–
DG540
+15 V
C
C
1
1
+
+
GNDs
C
C
2
2
D
D
D
D
1
2
3
4
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