DG419 Datasheet, PDF (9/10 Pages) Vishay Siliconix – DG419

TEST CIRCUITS
+5 V
+15 V
C
C
V_L
DG417/418
V+
S
0 V, 2.4 V IN
GND
D
V–
C
–15 V
DG417/418/419
Vishay Siliconix
Meter
HP4192A
Impedance
Analyzer
or Equivalent
f = 1 MHz
+15 V NC
C
V+ ^S2
S₁
DG419
0 V, 2.4 V _IN
D₂
GND
D₁
V–
C
FIGURE 9. Source/Drain Capacitances
–15 V
Meter
HP4192A
Impedance
Analyzer
or Equivalent
f = 1 MHz
APPLICATIONS
Switched Signal Powers Analog Switch
The analog switch in Figure 10 derives power from its input
signal, provided the input signal amplitude exceeds 4 V and its
frequency exceeds 1 kHz.
This circuit is useful when signals have to be routed to either
of two remote loads. Only three conductors are required: one
for the signal to be switched, one for the control signal and a
common return.
A positive input pulse turns on the clamping diode D₁ and
charges C₁. The charge stored on C₁ is used to power the
chip; operation is satisfactory because the switch requires less
than 1 mA of stand-by supply current. Loading of the signal
source is imperceptible. The DG419’s on-resistance is a low
100 W for a 5-V input signal.
D₁
Input
Control
V+
D
V_L
S₁
S₂
IN
DG419
GND
V–
C₁
0.01 mF
V_OUT
R_L1
10 kW
R_L2
10 kW
Document Number: 70051
S-52433—Rev. E, 06-Sep-99
FIGURE 10. Switched Signal Powers Remote SPDT Analog Switch
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